add histograms to check the mass of selected mesons

[u/mrichter/AliRoot.git] / ANALYSIS / AliPhysicsSelection.cxx

/* $Id: AliPhysicsSelection.cxx 35782 2009-10-22 11:54:31Z jgrosseo $ */

/**************************************************************************
 * Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

//-------------------------------------------------------------------------
//                      Implementation of   Class AliPhysicsSelection
// This class selects collision candidates from data runs, applying selection cuts on triggers 
// and background rejection based on the content of the ESD
//
// Usage:
//
// Create the object:
//   fPhysicsSelection = new AliPhysicsSelection;
//
// For MC data, call
//   fPhysicsSelection->SetAnalyzeMC()
//
// To check if an event is a collision candidate, use:
//   fPhysicsSelection->IsCollisionCandidate(fESD)
//
// After processing save the resulting histograms to a file with (a folder physics_selection 
//   will be created that contains the histograms):
//   fPhysicsSelection->SaveHistograms("physics_selection")
//
// To print statistics after processing use:
//   fPhysicsSelection->Print();
//
// The BX ids corresponding to real bunches crossings p2 are
// automatically selected. You cannot process runs with different
// filling schemes if this option is set. If you want to disable this,
// use: 
//   fPhysicsSelection->SetUseBXNumbers(0);
//
//
// If you are analizing muons and you want to keep the muon triggers
// besides the CINT1B you can set:
//   fPhysicsSelection->SetUseMuonTriggers();
//
//
// To compute the Background automatically using the control triggers
// use: 
//   fPhysicsSelection->SetComputeBG();
// this will show the value of the Beam Gas, accidentals and good
// events as additional rows in the statistic tables, but it will NOT
// subtract the background automatically.
// This option will only work for runs taken with the CINT1
// suite. This options enables automatically also the usage of BX
// numbers. You can only process one run at a time if you require this
// options, because it uses the bunch intensity estimated run by run.
// 
// The BG will usually be more important in the so-called "bin 0": the
// class can also compute the statistics table for events in this
// bin. Since the definition of bin 0 may in general change from
// analysis to analysis, the user needs to provide a callback
// implementing the definition of bin zero. The callback should be
// implemented as a method in the analysis task and should override
// the IsEventInBinZero method of AliAnalysisTaskSE, and should thus
// have the the following prototype:
//   Bool_t IsEventInBinZero(); 
// It should return true if the event is in the bin 0 and it is set by
// passing to the physics selection the NAME of the task where the
// callback is implemented: 
//   fPhysicsSelection->SetBin0Callback("MyTask").
//
//
// Usually the class selects the trigger scheme by itself depending on the run number.
// Nevertheless, you can do that manually by calling AddCollisionTriggerClass() and AddBGTriggerClass()
// Example:
// To define the class CINT1B-ABCE-NOPF-ALL as collision trigger (those will be accepted as  
// collision candidates when they pass the selection):
//   AddCollisionTriggerClass("+CINT1B-ABCE-NOPF-ALL #769 #3119");
// To select on bunch crossing IDs in addition, use:
//   AddCollisionTriggerClass("+CINT1B-ABCE-NOPF-ALL #769 #3119");
// To define the class CINT1A-ABCE-NOPF-ALL as a background trigger (those will only be counted
// for the control histograms):
//   AddBGTriggerClass("+CINT1A-ABCE-NOPF-ALL");
// You can also specify more than one trigger class in a string or you can require that some are *not*
// present. The following line would require CSMBA-ABCE-NOPF-ALL, but CSMBB-ABCE-NOPF-ALL is not allowed
// to be present:
//   AddBGTriggerClass("+CSMBA-ABCE-NOPF-ALL -CSMBB-ABCE-NOPF-ALL");
//
// The class also supports the triggers used in heavy ion runs
//
//   Origin: Jan Fiete Grosse-Oetringhaus, CERN 
//           Michele Floris, CERN
//-------------------------------------------------------------------------

#include <Riostream.h>
#include <TH1F.h>
#include <TH2F.h>
#include <TList.h>
#include <TIterator.h>
#include <TDirectory.h>
#include <TObjArray.h>
#include <TPRegexp.h>
#include <TFormula.h>
#include <TParameter.h>
#include <TInterpreter.h>

#include <AliPhysicsSelection.h>

#include <AliTriggerAnalysis.h>
#include <AliLog.h>

#include <AliESDEvent.h>
#include <AliAnalysisTaskSE.h>
#include "AliAnalysisManager.h"
#include "TPRegexp.h"
#include "TFile.h"
#include <AliOADBContainer.h>
#include "AliOADBPhysicsSelection.h"
#include "AliOADBFillingScheme.h"
#include "AliOADBTriggerAnalysis.h"

using std::cout;
using std::endl;
ClassImp(AliPhysicsSelection)

AliPhysicsSelection::AliPhysicsSelection() :
  AliAnalysisCuts("AliPhysicsSelection", "AliPhysicsSelection"),
  fCurrentRun(-1),
  fMC(kFALSE),
  fCollTrigClasses(),
  fBGTrigClasses(),
  fTriggerAnalysis(),
//  fHistStatisticsTokens(0),
  fHistBunchCrossing(0),
  fHistTriggerPattern(0),
  fSkipTriggerClassSelection(0),
  fUsingCustomClasses(0),
  fSkipV0(0),
  fBIFactorA(-1),
  fBIFactorC(-1),
  fBIFactorAC(-1), 
  fComputeBG(0),
  fBGStatOffset(-1),
  fUseBXNumbers(1),
  fUseMuonTriggers(0),
  fFillingScheme(""),
  fBin0CallBack(""),
  fBin0CallBackPointer(0),
  fIsPP(kFALSE),
  fPSOADB(0),
  fFillOADB(0),
  fTriggerOADB(0),
  fRegexp(0),
  fCashedTokens(0)
  
{
  // constructor
  
  fCollTrigClasses.SetOwner(1);
  fBGTrigClasses.SetOwner(1);
  fTriggerAnalysis.SetOwner(1);
  fHistStatistics[0] = 0;
  fHistStatistics[1] = 0;
  
  fRegexp = new TPRegexp("([[:alpha:]]\\w*)");
  fCashedTokens = new TList;
  fCashedTokens->SetOwner();
  
  AliLog::SetClassDebugLevel("AliPhysicsSelection", AliLog::kWarning);
}
    
AliPhysicsSelection::~AliPhysicsSelection()
{
  // destructor

  fCollTrigClasses.Delete();
  fBGTrigClasses.Delete();
  fTriggerAnalysis.Delete();

  if (fHistStatistics[0])
  {
    delete fHistStatistics[0];
    fHistStatistics[0] = 0;
  }
  if (fHistStatistics[1])
  {
    delete fHistStatistics[1];
    fHistStatistics[1] = 0;
  }
  // if (fHistStatisticsTokens) {
  //   delete fHistStatisticsTokens;
  //   fHistStatisticsTokens = 0;
  // }
  if (fHistBunchCrossing)
  {
    delete fHistBunchCrossing;
    fHistBunchCrossing = 0;
  }
  if (fHistTriggerPattern)
  {
    delete fHistTriggerPattern;
    fHistTriggerPattern = 0;
  }

  if (fPSOADB)
  { 
    delete fPSOADB;
    fPSOADB = 0;    
  }  
  if (fFillOADB)
  { 
    delete fFillOADB;
    fFillOADB = 0;
  }  
  if (fTriggerOADB)
  { 
    delete fTriggerOADB;
    fTriggerOADB = 0;
  }  
  
  if (fRegexp)
  {
    delete fRegexp;
    fRegexp = 0;
  }
    
  if (fCashedTokens)
  {
    delete fCashedTokens;
    fCashedTokens = 0;
  }


}

UInt_t AliPhysicsSelection::CheckTriggerClass(const AliESDEvent* aEsd, const char* trigger, Int_t& triggerLogic) const
{
  // checks if the given trigger class(es) are found for the current event
  // format of trigger: +TRIGGER1,TRIGGER1b,TRIGGER1c -TRIGGER2 [#XXX] [&YY] [*ZZ]
  //   requires one out of TRIGGER1,TRIGGER1b,TRIGGER1c and rejects TRIGGER2
  //   in bunch crossing XXX
  //   if successful, YY is returned (for association between entry in fCollTrigClasses and AliVEvent::EOfflineTriggerTypes)
  //   triggerLogic is filled with ZZ, defaults to kCINT1
  
  Bool_t foundBCRequirement = kFALSE;
  Bool_t foundCorrectBC = kFALSE;
  
  UInt_t returnCode = AliVEvent::kUserDefined;
  triggerLogic = kCINT1;
  
  AliDebug(AliLog::kDebug+1, Form("Processing event with triggers %s", aEsd->GetFiredTriggerClasses().Data()));
  
  TString str(trigger);
  TObjArray* tokens = str.Tokenize(" ");
  
  for (Int_t i=0; i < tokens->GetEntries(); i++)
  {
    TString str2(((TObjString*) tokens->At(i))->String());
    
    if (str2[0] == '+' || str2[0] == '-')
    {
      Bool_t flag = (str2[0] == '+');
      
      str2.Remove(0, 1);
      
      TObjArray* tokens2 = str2.Tokenize(",");
      
      Bool_t foundTriggerClass = kFALSE;
      for (Int_t j=0; j < tokens2->GetEntries(); j++)
      {
        TString str3(((TObjString*) tokens2->At(j))->String());
        
        if (flag && aEsd->IsTriggerClassFired(str3))
          foundTriggerClass = kTRUE;
        if (!flag && aEsd->IsTriggerClassFired(str3))
        {
          AliDebug(AliLog::kDebug+1, Form("Rejecting event because trigger class %s is present", str3.Data()));
          delete tokens2;
          delete tokens;
          return kFALSE;
        }
      }
      
      delete tokens2;
      
      if (flag && !foundTriggerClass)
      {
        AliDebug(AliLog::kDebug+1, Form("Rejecting event because (none of the) trigger class(es) %s is present", str2.Data()));
        delete tokens;
        return kFALSE;
      }
    }
    else if (str2[0] == '#')
    {
      foundBCRequirement = kTRUE;
    
      str2.Remove(0, 1);
      
      Int_t bcNumber = str2.Atoi();
      AliDebug(AliLog::kDebug+1, Form("Checking for bunch crossing number %d", bcNumber));
      
      if (aEsd->GetBunchCrossNumber() == bcNumber)
      {
        foundCorrectBC = kTRUE;
        AliDebug(AliLog::kDebug+1, Form("Found correct bunch crossing %d", bcNumber));
      }
    }
    else if (str2[0] == '&')
    {
      str2.Remove(0, 1);
      
      returnCode = str2.Atoll();
    }
    else if (str2[0] == '*')
    {
      str2.Remove(0, 1);
      
      triggerLogic = str2.Atoi();
    }
    else
      AliFatal(Form("Invalid trigger syntax: %s", trigger));
  }
  
  delete tokens;
  
  if (foundBCRequirement && !foundCorrectBC)
    return kFALSE;
  
  return returnCode;
}

//______________________________________________________________________________
TObject *AliPhysicsSelection::GetStatistics(const Option_t *option) const
{
// Get the statistics histograms ("ALL" and "BIN0" and "TOK")
   TString opt(option);
   opt.ToUpper();
   Int_t ihist = 0;
   if (opt == "ALL") ihist = kStatIdxAll;
   if (opt == "BIN0") ihist = kStatIdxBin0;
   //   if (opt == "TOK") return fHistStatisticsTokens;
   return fHistStatistics[ihist];
}   

//______________________________________________________________________________
Bool_t AliPhysicsSelection::EvaluateTriggerLogic(const AliESDEvent* aEsd, AliTriggerAnalysis* triggerAnalysis, const char* triggerLogic, Bool_t offline)
{
  // evaluates trigger logic. If called with no ESD pointer/triggerAnalysis pointer, it just caches the tokens
  // Fills the statistics histogram, if booked at row i
  TString trigger(triggerLogic);
  
  // add space after each token (to use ReplaceAll later)
  fRegexp->Substitute(trigger, "$1 ", "g");
  
  while (1)
  {
    AliDebug(AliLog::kDebug, trigger.Data());
    
    TArrayI pos;
    Int_t nMatches = fRegexp->Match(trigger, "", 0, 2, &pos);

    if (nMatches <= 0)
      break;
      
    TString token(trigger(pos[0], pos[1]-pos[0]+1));
    
    TParameter<Int_t>* param = (TParameter<Int_t>*) fCashedTokens->FindObject(token);
    if (!param)
    {
      TInterpreter::EErrorCode error;
      Int_t bit = gInterpreter->ProcessLine(Form("AliTriggerAnalysis::k%s;", token.Data()), &error);
      
      if (error > 0)
        AliFatal(Form("Trigger token %s unknown", token.Data()));
      
      param = new TParameter<Int_t>(token, bit);
      fCashedTokens->Add(param);
      AliDebug(AliLog::kDebug, "Added token");
    }
    
    Long64_t bit = param->GetVal();
    
    AliDebug(AliLog::kDebug, Form("Tok %d %d %s %lld", pos[0], pos[1], token.Data(), bit));
    
    if (offline) 
      bit |= AliTriggerAnalysis::kOfflineFlag;
    
    if(aEsd && triggerAnalysis) {
      trigger.ReplaceAll(token, Form("%d", triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) bit)));
      //      if(fHistStatisticsTokens) 	      
    }
  }

  TFormula formula("formula", trigger);
  if (formula.Compile() > 0)
    AliFatal(Form("Could not evaluate trigger logic %s (evaluated to %s)", triggerLogic, trigger.Data()));
  Bool_t result = formula.Eval(0);
  
  AliDebug(AliLog::kDebug, Form("%s --> %d", trigger.Data(), result));
  
  return result;
}

//______________________________________________________________________________
UInt_t AliPhysicsSelection::IsCollisionCandidate(const AliESDEvent* aEsd)
{
  // checks if the given event is a collision candidate
  //
  // returns a bit word describing the fired offline triggers (see AliVEvent::EOfflineTriggerTypes)
  AliAnalysisManager *mgr = AliAnalysisManager::GetAnalysisManager();
  if (!mgr) {
    AliError("Cannot get the analysis manager");
    return 0;
  } 
  mgr->LoadBranch("AliESDHeader.");
  mgr->LoadBranch("AliESDRun.");

  if (fCurrentRun != aEsd->GetRunNumber()) {
    if (!Initialize(aEsd))
      AliFatal(Form("Could not initialize for run %d", aEsd->GetRunNumber()));
    if(fComputeBG) SetBIFactors(aEsd); // is this safe here?
  }
  const AliESDHeader* esdHeader = aEsd->GetHeader();
  if (!esdHeader)
  {
    AliError("ESD Header could not be retrieved");
    return kFALSE;
  }
  
  // check event type; should be PHYSICS = 7 for data and 0 for MC
  if (!fMC)
  {
    if (esdHeader->GetEventType() != 7)
      return kFALSE;
  }
  else
  {
    if (esdHeader->GetEventType() != 0)
      AliFatal(Form("Invalid event type for MC: %d", esdHeader->GetEventType()));
  }
  
  mgr->LoadBranch("AliMultiplicity.");
//mgr->LoadBranch("AliESDFMD.");
  mgr->LoadBranch("AliESDVZERO.");
  mgr->LoadBranch("AliESDZDC.");
  mgr->LoadBranch("SPDVertex.");
  mgr->LoadBranch("PrimaryVertex.");
  mgr->LoadBranch("TPCVertex.");
  mgr->LoadBranch("Tracks");
  mgr->LoadBranch("SPDPileupVertices");

  UInt_t accept = 0;
    
  Int_t count = fCollTrigClasses.GetEntries() + fBGTrigClasses.GetEntries();
  for (Int_t i=0; i < count; i++)
  {
    const char* triggerClass = 0;
    if (i < fCollTrigClasses.GetEntries())
      triggerClass = ((TObjString*) fCollTrigClasses.At(i))->String();
    else
      triggerClass = ((TObjString*) fBGTrigClasses.At(i - fCollTrigClasses.GetEntries()))->String();
  
    AliDebug(AliLog::kDebug+1, Form("Processing trigger class %s", triggerClass));
  
    AliTriggerAnalysis* triggerAnalysis = static_cast<AliTriggerAnalysis*> (fTriggerAnalysis.At(i));
  
    triggerAnalysis->FillTriggerClasses(aEsd);
    
    Int_t triggerLogic = 0; 
    UInt_t singleTriggerResult = CheckTriggerClass(aEsd, triggerClass, triggerLogic);
    
    if (singleTriggerResult)
    {
      triggerAnalysis->FillHistograms(aEsd);
  
      Bool_t isBin0 = kFALSE;
      if (fBin0CallBack != "") {
	  isBin0 = ((AliAnalysisTaskSE*)mgr->GetTask(fBin0CallBack.Data()))->IsEventInBinZero();
      } else if (fBin0CallBackPointer) {
	  isBin0 = (*fBin0CallBackPointer)(aEsd);
      }
      
      // ---->
      // FIXME: this stuff is still used to fill the stat
      // tables. Decide wethere we are switching to a new stat table
      // (with all AliTriggerAnalysis tokens? Only we the tokens
      // actually used in the selection?) and clean up

      // hardware trigger
      Int_t fastORHW   = triggerAnalysis->EvaluateTrigger(aEsd, AliTriggerAnalysis::kSPDGFO); // SPD number of chips from trigger bits (!)
      //      Int_t fastORHWL1 = triggerAnalysis->EvaluateTrigger(aEsd, AliTriggerAnalysis::kSPDGFOL1); // SPD number of chips from trigger bits in second layer (!)
      Bool_t v0AHW     = fSkipV0 ? 0 : triggerAnalysis->EvaluateTrigger(aEsd, AliTriggerAnalysis::kV0A);// should replay hw trigger
      Bool_t v0CHW     = fSkipV0 ? 0 : triggerAnalysis->EvaluateTrigger(aEsd, AliTriggerAnalysis::kV0C);// should replay hw trigger
      
      // offline trigger
      Int_t fastOROffline   = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kSPDGFO)); // SPD number of chips from clusters (!)
      Int_t fastOROfflineL1 = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kSPDGFOL1)); // SPD number of chips from clusters in second layer (!)
      Bool_t v0A       = fSkipV0 ? 0 : triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kV0A));
      Bool_t v0C       = fSkipV0 ? 0 : triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kV0C));
      Bool_t v0ABG = fSkipV0 ? 0 : triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kV0ABG));
      Bool_t v0CBG = fSkipV0 ? 0 : triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kV0CBG));
      Bool_t v0BG = v0ABG || v0CBG;
      Bool_t t0       = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kT0    ));
      Bool_t t0BG     = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kT0BG    ));
      Bool_t t0PileUp = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kT0Pileup));

      // fmd
      // Bool_t fmdA = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kFMDA));
      // Bool_t fmdC = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kFMDC));
      // Bool_t fmd  = fmdA || fmdC;
    
      // SSD
      //Int_t ssdClusters = triggerAnalysis->SSDClusters(aEsd);
      
      // ZDC
      // Bool_t zdcA = triggerAnalysis->IsOfflineTriggerFired(aEsd, AliTriggerAnalysis::kZDCA);
      // Bool_t zdcC = triggerAnalysis->IsOfflineTriggerFired(aEsd, AliTriggerAnalysis::kZDCC);
      Bool_t zdcA    = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kZDCTDCA));
      Bool_t zdcC    = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kZDCTDCC));
      Bool_t zdcTime = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kZDCTime));

      Bool_t laserCut = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kTPCLaserWarmUp));

      // Some "macros"
      Bool_t mb1 = (fastOROffline > 0 || v0A || v0C) && (!v0BG);
      Bool_t mb1prime = (fastOROffline > 1 || (fastOROffline > 0 && (v0A || v0C)) || (v0A && v0C) ) && (!v0BG);

      // Background rejection
      Bool_t bgID = kFALSE;
      bgID = triggerAnalysis->EvaluateTrigger(aEsd,  (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kSPDClsVsTrkBG | AliTriggerAnalysis::kOfflineFlag)); // FIXME: temporarily, we keep both ways to validate the new one. if the external BG id is not set, it will use the new one
      
      /*Int_t ntrig = fastOROffline; // any 2 hits
      if(v0A)              ntrig += 1;
      if(v0C)              ntrig += 1; //v0C alone is enough
      if(fmd)              ntrig += 1;
      if(ssdClusters>1)    ntrig += 1;*/

      // // EMCAL offline trigger validation
      // Bool_t emcCut = triggerAnalysis->EvaluateTrigger(aEsd, (AliTriggerAnalysis::Trigger) (AliTriggerAnalysis::kOfflineFlag | AliTriggerAnalysis::kEMCAL));
      
      // <---

      TString triggerLogicOnline  = fPSOADB->GetHardwareTrigger(triggerLogic);
      TString triggerLogicOffline = fPSOADB->GetOfflineTrigger(triggerLogic);

      AliDebug(AliLog::kDebug, Form("Triggers from OADB [0x%x][%d][%s][%s]",singleTriggerResult,AliOADBPhysicsSelection::GetActiveBit(singleTriggerResult),triggerLogicOffline.Data(),triggerLogicOnline.Data()));

      // replay hardware trigger (should only remove events for MC)
      Bool_t onlineTrigger  = EvaluateTriggerLogic(aEsd, triggerAnalysis, triggerLogicOnline, kFALSE);
      // offline selection
      Bool_t offlineTrigger = EvaluateTriggerLogic(aEsd, triggerAnalysis, triggerLogicOffline, kTRUE);
      
      // Printf("%s %s", triggerLogicOnline.Data(), triggerLogicOffline.Data());
      // Printf("%d %d", onlineTrigger, offlineTrigger);
	   

      // Fill trigger pattern histo
      Int_t tpatt = 0;
      if (fastORHW>0) tpatt+=1;
      if (v0AHW)      tpatt+=2;
      if (v0CHW)      tpatt+=4;
      fHistTriggerPattern->Fill( tpatt );

      // fill statistics and return decision
      const Int_t nHistStat = 2;
      for(Int_t iHistStat = 0; iHistStat < nHistStat; iHistStat++){
	if (iHistStat == kStatIdxBin0 && !isBin0) continue; // skip the filling of bin0 stats if the event is not in the bin0
      
	fHistStatistics[iHistStat]->Fill(kStatTriggerClass, i);
	if(iHistStat == kStatIdxAll) fHistBunchCrossing->Fill(aEsd->GetBunchCrossNumber(), i); // Fill only for all (avoid double counting)

	// We fill the rest only if hw trigger is ok
	if (!onlineTrigger)
	  {
	    AliDebug(AliLog::kDebug, "Rejecting event because hardware trigger is not fired");
	    continue;
	  } else {       
	  fHistStatistics[iHistStat]->Fill(kStatHWTrig, i);
	}
      

	// v0 BG stats
	if (v0ABG)
	  fHistStatistics[iHistStat]->Fill(kStatV0ABG, i);
	if (v0CBG)
	  fHistStatistics[iHistStat]->Fill(kStatV0CBG, i);

	// T0 stats
	if(t0)
	  fHistStatistics[iHistStat]->Fill(kStatT0BB,     i);
	if(t0BG)
	  fHistStatistics[iHistStat]->Fill(kStatT0BG,     i);
	if(t0PileUp)
	  fHistStatistics[iHistStat]->Fill(kStatT0PileUp, i);

	// mb 1
	if (mb1)
	  fHistStatistics[iHistStat]->Fill(kStatMB1, i);

	if (mb1prime)
	  fHistStatistics[iHistStat]->Fill(kStatMB1Prime, i);

	if (laserCut)
	  fHistStatistics[iHistStat]->Fill(kStatLaserCut, i);

	//if(ntrig >= 2 && !v0BG) 
	//  fHistStatistics[iHistStat]->Fill(kStatAny2Hits, i);

	if (fastOROffline > 0)
	  fHistStatistics[iHistStat]->Fill(kStatFO1, i);
	if (fastOROffline > 1)
	  fHistStatistics[iHistStat]->Fill(kStatFO2, i);
	if (fastOROfflineL1 > 1)
	  fHistStatistics[iHistStat]->Fill(kStatFO2L1, i);
        
	if (v0A)
	  fHistStatistics[iHistStat]->Fill(kStatV0A, i);
	if (v0C)
	  fHistStatistics[iHistStat]->Fill(kStatV0C, i);
	  
	if (zdcA)
	  fHistStatistics[iHistStat]->Fill(kStatZDCA, i);
	if (zdcC)
	  fHistStatistics[iHistStat]->Fill(kStatZDCC, i);
	if (zdcA && zdcC)
	  fHistStatistics[iHistStat]->Fill(kStatZDCAC, i);

	if (zdcTime)
	  fHistStatistics[iHistStat]->Fill(kStatZDCTime, i);
  
	if (v0A && v0C && !v0BG && (!bgID && fIsPP))
	  fHistStatistics[iHistStat]->Fill(kStatV0, i);

	if (bgID && !v0BG) 
	  fHistStatistics[iHistStat]->Fill(kStatBG, i);

	// FIXME: check lines below
	if ( offlineTrigger )
	  {
	    if (!v0BG || fSkipV0)
	      {
		if (!v0BG) fHistStatistics[iHistStat]->Fill(kStatOffline, i);
		AliDebug(AliLog::kDebug, Form("Accepted event for histograms with trigger logic %d", triggerLogic));
            
		fHistStatistics[iHistStat]->Fill(kStatAccepted, i);
		
		if (aEsd->IsPileupFromSPD())
		  fHistStatistics[iHistStat]->Fill(kStatAcceptedPileUp, i);
		
		    // if(iHistStat == kStatIdxAll) fHistBunchCrossing->Fill(aEsd->GetBunchCrossNumber(), i); // Fill only for all (avoid double counting)
		if((i < fCollTrigClasses.GetEntries() || fSkipTriggerClassSelection) && (iHistStat==kStatIdxAll))
		  accept |= singleTriggerResult; // only set for "all" (should not really matter)
	      }
	    else
	      AliDebug(AliLog::kDebug, "Rejecting event because of V0 BG flag");
	  }
	else
	  AliDebug(AliLog::kDebug, Form("Rejecting event because trigger logic %d is not fulfilled", triggerLogic));
      }
    }
  }
 
  if (accept)
    AliDebug(AliLog::kDebug, Form("Accepted event as collision candidate with bit mask %d", accept));
  
  return accept;
}


// const char * AliPhysicsSelection::GetFillingScheme(UInt_t runNumber)  {

//   if(fMC) return "MC";

//   if      (runNumber >= 104065 && runNumber <= 104160) {
//     return "4x4a";
//   } 
//   else if (runNumber >= 104315 && runNumber <= 104321) {
//     return "4x4a*";
//   }
//   else if (runNumber >= 104792 && runNumber <= 104803) {
//     return "4x4b";
//   }
//   else if (runNumber >= 104824 && runNumber <= 104892) {
//     return "4x4c";
//   }
//   else if (runNumber == 105143 || runNumber == 105160) {
//     return "16x16a";
//   }
//   else if (runNumber >= 105256 && runNumber <= 105268) {
//     return "4x4c";
//   } 
//   else if (runNumber >= 114786 && runNumber <= 116684) {
//     return "Single_2b_1_1_1";
//   }
//   else if (runNumber >= 117048 && runNumber <= 117120) {
//     return "Single_3b_2_2_2";
//   }
//   else if (runNumber >= 117220 && runNumber <= 119163) {
//     return "Single_2b_1_1_1";
//   }
//   else if (runNumber >= 119837 && runNumber <= 119862) {
//     return "Single_4b_2_2_2";
//   }
//   else if (runNumber >= 119902 && runNumber <= 120691) {
//     return "Single_6b_3_3_3";
//   }
//   else if (runNumber >= 120741 && runNumber <= 122375) {
//     return "Single_13b_8_8_8";
//   }
//   else if (runNumber >= 130148 && runNumber <= 130375) {
//     return "125n_48b_36_16_36";
//   } 
//   else if (runNumber >= 130601 && runNumber <= 130640) {
//     return "1000ns_50b_35_14_35";
//   }
//   else {
//     AliError(Form("Unknown filling scheme (run %d)", runNumber));
//   }

//   return "Unknown";
// }

// const char * AliPhysicsSelection::GetBXIDs(UInt_t runNumber, const char * trigger)  {

//   if (!fUseBXNumbers || fMC) return "";

//   if      (runNumber >= 104065 && runNumber <= 104160) {
//     if     (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return " #2128 #3019";
//     else if(!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return " #346 #3465";
//     else if(!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return " #1234 #1680";
//     else if(!strcmp("CINT1-E-NOPF-ALL",trigger))     return " #790";
//     //    else AliError(Form("Unknown trigger: %s", trigger));
//   } 
//   else if (runNumber >= 104315 && runNumber <= 104321) {
//     if     (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return " #2000 #2891";
//     else if(!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return " #218 #3337";
//     else if(!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return " #1106 #1552";
//     else if(!strcmp("CINT1-E-NOPF-ALL",trigger))     return " #790";
//     //    else AliError(Form("Unknown trigger: %s", trigger));
//   }
//   else if (runNumber >= 104792 && runNumber <= 104803) {
//     if     (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return " #2228 #3119";
//     else if(!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return " #2554 #446";
//     else if(!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return " #1334 #769";
//     else if(!strcmp("CINT1-E-NOPF-ALL",trigger))     return " #790";
//     //    else AliError(Form("Unknown trigger: %s", trigger));
//   }
//   else if (runNumber >= 104824 && runNumber <= 104892) {
//     if     (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return " #3119 #769";
//     else if(!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return " #2554 #446";
//     else if(!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return " #1334 #2228";
//     else if(!strcmp("CINT1-E-NOPF-ALL",trigger))     return " #790";
//     //    else AliError(Form("Unknown trigger: %s", trigger));
//   }
//   else if (runNumber == 105143 || runNumber == 105160) {
//     if     (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return " #1337 #1418 #2228 #2309 #3119 #3200 #446 #527";
//     else if(!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return " #1580  #1742  #1904  #2066  #2630  #2792  #2954  #3362";
//     else if(!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return "  #845  #1007  #1169   #1577 #3359 #3521 #119  #281 ";
//     else if(!strcmp("CINT1-E-NOPF-ALL",trigger))     return " #790";
//     //    else AliError(Form("Unknown trigger: %s", trigger));
//   }
//   else if (runNumber >= 105256 && runNumber <= 105268) {
//     if     (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return " #3019 #669";
//     else if(!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return " #2454 #346";
//     else if(!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return " #1234 #2128";
//     else if(!strcmp("CINT1-E-NOPF-ALL",trigger))     return " #790";
//     //    else AliError(Form("Unknown trigger: %s", trigger));
//   } else if (runNumber >= 114786 && runNumber <= 116684) { // 7 TeV 2010, assume always the same filling scheme
//     if     (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return " #346";
//     else if(!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return " #2131";
//     else if(!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return " #3019";
//     else if(!strcmp("CINT1-E-NOPF-ALL",trigger))     return " #1238";
//     //    else AliError(Form("Unknown trigger: %s", trigger));
//   }
//   else if (runNumber >= 117048 && runNumber <= 117120) {
//     //    return "Single_3b_2_2_2";
//    if      (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return "   #346  #1240 ";
//    else if (!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return "   #2131 ";
//    else if (!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return "   #3019 ";
//    else if (!strcmp("CINT1-E-NOPF-ALL",trigger)) return " #1238";
//    //   else AliError(Form("Unknown trigger: %s", trigger));

//   }
//   else if ((runNumber >= 117220 && runNumber <= 118555) || (runNumber >= 118784 && runNumber <= 119163)) 
//   {
//     //    return "Single_2b_1_1_1";
//     if      (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return "   #346 ";
//     else if (!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return "   #2131 ";
//     else if (!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return "   #3019 ";
//     else if (!strcmp("CINT1-E-NOPF-ALL",trigger)) return " #1238 ";
//     //    else AliError(Form("Unknown trigger: %s", trigger));						    
//   }
//   else if (runNumber >= 118556 && runNumber <= 118783) {
//     //    return "Single_2b_1_1_1"; 
//     // same as previous but was misaligned by 1 BX in fill 1069
//     if      (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return "   #345 ";
//     else if (!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return "   #2130 ";
//     else if (!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return "   #3018 ";
//     else if (!strcmp("CINT1-E-NOPF-ALL",trigger)) return " #1238 ";
//     //    else AliError(Form("Unknown trigger: %s", trigger));						    
//   }
//   else if (runNumber >= 119837 && runNumber <= 119862) {
//     //    return "Single_4b_2_2_2";
//     if      (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return "   #669  #3019 ";
//     else if (!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return "   #346  #2454 ";
//     else if (!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return "   #1234  #2128 ";
//     else if (!strcmp("CINT1-E-NOPF-ALL",trigger)) return " #1681 #3463";
//     //    else AliError(Form("Unknown trigger: %s", trigger));

//   }
//   else if (runNumber >= 119902 && runNumber <= 120691) {
//     //    return "Single_6b_3_3_3";
//     if      (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return "   #346  #546  #746 ";
//     else if (!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return "   #2131  #2331  #2531 ";
//     else if (!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return "   #3019  #3219  #3419 ";
//     else if (!strcmp("CINT1-E-NOPF-ALL",trigger)) return " #1296 #1670";
//     //    else AliError(Form("Unknown trigger: %s", trigger));
//   }
//   else if (runNumber >= 120741 && runNumber <= 122375) {
//     //    return "Single_13b_8_8_8";
//     if      (!strcmp("CINT1B-ABCE-NOPF-ALL",trigger)) return "   #346  #446  #546  #646  #1240  #1340  #1440  #1540 ";
//     else if (!strcmp("CINT1A-ABCE-NOPF-ALL",trigger)) return "   #946  #2131  #2231  #2331  #2431 ";
//     else if (!strcmp("CINT1C-ABCE-NOPF-ALL",trigger)) return "   #3019  #3119  #3219  #3319  #3519 ";
//     else if (!strcmp("CINT1-E-NOPF-ALL",trigger)) return " #1835 #2726";
//     //    else AliError(Form("Unknown trigger: %s", trigger));
    
//   } 
//   else if (runNumber >= 130148 && runNumber <= 130375) {
//     TString triggerString = trigger;
//     static TString returnString = " ";
//     returnString = "";
//     if (triggerString.Contains("B")) returnString += "   #346  #396  #446  #496  #546  #596  #646  #696  #1240  #1290  #1340  #1390  #1440  #1490  #1540  #1590 ";
//     if (triggerString.Contains("A")) returnString += "   #755  #805  #855  #905  #955  #1005  #1799  #1849  #1899  #2131  #2181  #2231  #2281  #2331  #2381  #2431  #2481  #2531  #2581  #2631  #2846  #3016  #3066  #3116  #3166  #3216  #3266  #3316  #3366  #3425  #3475  #3525 ";
//     if (triggerString.Contains("C")) returnString += "   #3019  #3069  #3119  #3169  #3219  #3269  #3319  #3369  #14  #64  #114  #746  #796  #846  #908  #958  #1008  #1640  #1690  #1740  #2055  #2125  #2175  #2225  #2275  #2325  #2375  #2425  #2475  #2534  #2584  #2634 ";
//     // Printf("0x%x",returnString.Data());
//     // Printf("%s",returnString.Data());
//     return returnString.Data();
//   } 
//   else if (runNumber >= 130601 && runNumber <= 130640) {
//     TString triggerString = trigger;
//     static TString returnString = " ";
//     returnString = "";
//     if (triggerString.Contains("B")) returnString += "  #346  #386  #426  #466  #506  #546  #586  #1240  #1280  #1320  #1360  #1400  #1440  #1480 ";
//     if (triggerString.Contains("A")) returnString += "  #626  #666  #706  #746  #786  #826  #866  #1520  #1560  #1600  #1640  #1680  #1720  #1760  #2076  #2131  #2171  #2211  #2251  #2291  #2331  #2371  #2414  #2454  #2494  #2534  #2574  #2614  #2654  #2694  #2734  #2774  #2814 "; //#2854  #2894  #2934 not present in this run
//     if (triggerString.Contains("C")) returnString += "  #3019  #3059  #3099  #3139  #3179  #3219  #3259  #3299  #3339  #3379  #3419  #3459  #3499  #3539  #115  #629  #669  #709  #749  #789  #829  #869  #909  #949  #989  #1029  #1069  #1109  #1149  #1523  #1563  #1603  #1643 "; //#1683  #1723  #1763 not present in this run
//     return returnString.Data();
//   }

//   else {
//     AliWarning(Form("Unknown run %d, using all BXs!",runNumber));
//   }

//   return "";
// }

Bool_t AliPhysicsSelection::Initialize(const AliESDEvent* aEsd)
{
  // initializes the object for the given ESD
  
  AliInfo(Form("Initializing for beam type: %s", aEsd->GetESDRun()->GetBeamType()));
  fIsPP = kTRUE;
  if (strcmp(aEsd->GetESDRun()->GetBeamType(), "A-A") == 0)
    fIsPP = kFALSE;

  return Initialize(aEsd->GetRunNumber());
}

Bool_t AliPhysicsSelection::Initialize(Int_t runNumber)
{
  // initializes the object for the given run  


  Bool_t oldStatus = TH1::AddDirectoryStatus();
  TH1::AddDirectory(kFALSE);

  /// Open OADB file and fetch OADB objects
  TString oadbfilename = AliPhysicsSelection::GetOADBFileName();

  TFile * foadb = TFile::Open(oadbfilename);
  if(!foadb->IsOpen()) AliFatal(Form("Cannot open OADB file %s", oadbfilename.Data()));


  if(!fPSOADB || !fUsingCustomClasses) { // if it's already set and custom class is required, we use the one provided by the user
    AliInfo("Using Standard OADB");
    AliOADBContainer * psContainer = (AliOADBContainer*) foadb->Get("physSel");
    if (!psContainer) AliFatal("Cannot fetch OADB container for Physics selection");
    fPSOADB = (AliOADBPhysicsSelection*) psContainer->GetObject(runNumber, fIsPP ? "oadbDefaultPP" : "oadbDefaultPbPb");
    if (!fPSOADB) AliFatal(Form("Cannot find physics selection object for run %d", runNumber));
  } else {
    AliInfo("Using Custom OADB");
  }
  if(!fFillOADB || !fUsingCustomClasses) { // if it's already set and custom class is required, we use the one provided by the user
    AliOADBContainer * fillContainer = (AliOADBContainer*) foadb->Get("fillScheme");
    if (!fillContainer) AliFatal("Cannot fetch OADB container for filling scheme");
    fFillOADB = (AliOADBFillingScheme*) fillContainer->GetObject(runNumber, "Default");
    if (!fFillOADB) AliFatal(Form("Cannot find  filling scheme object for run %d", runNumber));
  }
  if(!fTriggerOADB || !fUsingCustomClasses) { // if it's already set and custom class is required, we use the one provided by the user
    AliOADBContainer * triggerContainer = (AliOADBContainer*) foadb->Get("trigAnalysis");
    if (!triggerContainer) AliFatal("Cannot fetch OADB container for trigger analysis");
    fTriggerOADB = (AliOADBTriggerAnalysis*) triggerContainer->GetObject(runNumber, "Default");
    fTriggerOADB->Print();
    if (!fTriggerOADB) AliFatal(Form("Cannot find  trigger analysis object for run %d", runNumber));
  }

  
  if(!fBin0CallBack) 
    AliError("Bin0 Callback not set: will not fill the statistics for the bin 0");

  if (fMC) {
    // override BX and bg options in case of MC
    fComputeBG    = kFALSE;
    fUseBXNumbers = kFALSE;
  }

  // FIXME: think how to implement this check with the OADB, trigger scheme is not a int number here 
  // Int_t triggerScheme = GetTriggerScheme(runNumber);
  // if (!fUsingCustomClasses && fCurrentRun != -1 && triggerScheme != GetTriggerScheme(fCurrentRun))
  //   AliFatal("Processing several runs with different trigger schemes is not supported");
  
  if(fComputeBG && fCurrentRun != -1 && fCurrentRun != runNumber) 
    AliFatal("Cannot process several runs because BG computation is requested");

  if(fComputeBG && !fUseBXNumbers) 
    AliFatal("Cannot compute BG if BX numbers are not used");
  
  if(fUseBXNumbers && fFillingScheme != "" && fFillingScheme != fFillOADB->GetFillingSchemeName())
    AliFatal("Cannot process runs with different filling scheme if usage of BX numbers is requested");

  fFillingScheme      = fFillOADB->GetFillingSchemeName();

  AliInfo(Form("Initializing for run %d", runNumber));
  
  // initialize first time?
  if (fCurrentRun == -1)
  {
    const UInt_t ntriggerBits = fPSOADB->GetNTriggerBits(); // FIXME!
    for(UInt_t ibit = 0; ibit < ntriggerBits; ibit++){
      
      TIterator * collIter = fPSOADB->GetCollTrigClass(ibit)->MakeIterator();
      TIterator * bgIter   = fPSOADB->GetBGTrigClass(ibit)->MakeIterator();
      TObjString * obj = 0;
      while((obj = (TObjString*) collIter->Next())){
	if (obj->String() != "") {
	  fCollTrigClasses.Add(new TObjString(GetTriggerString(obj)));
	}
      }
      // BG classes only make sense for real data
      if(!fMC) {
	obj = 0 ;
	while((obj = (TObjString*) bgIter->Next())){
	  if (obj->String() != "") {
	    fBGTrigClasses.Add(new TObjString(GetTriggerString(obj)));
	  }
	}
      }

    }
    // not sure how to handle this in the case of > x cuts
    // // Book the token histo with the tokens actually used here!
    // // 1. Cache the tokens
    // for(UInt_t ibit = 0; ibit < ntriggerBits; ibit++){
    // 	EvaluateTriggerLogic(0,0, fPSOADB->GetHardwareTrigger(ibit), 0);
    // 	EvaluateTriggerLogic(0,0, fPSOADB->GetOfflineTrigger(ibit),  1);
    // }
    // // 2. Book the histogram
    // if (!fHistStatisticsTokens) {
    // 	Int_t ntokens = fCashedTokens->GetEntries();
    // 	Int_t count = fCollTrigClasses->GetEntries() + fBGTrigClasses->GetEntries();
    // 	fHistStatisticsTokens = new TH2F("fHistStatisticsTokens", "fHistStatisticsTokens", ntokens + 2, 0.5, ntokens+2+0.5, count, -0.5, -0.5 + count);
	
    // 	Int_t nrow = 0;
    // 	fHistStatisticsTokens->GetXaxis()->SetBinLabel(nrow++,  "Trigger class");
    // 	for(Int_t itoken = 0; itoken < ntoken; itoken++){
    // 	  TParameter<Int_t> * param = fCashedTokens->At(itoken);
    // 	  fHistStatisticsTokens->GetXaxis()->SetBinLabel(nrow++,  param->GetName());	  
    // 	}
	
    // 	fHistStatisticsTokens->GetXaxis()->SetBinLabel(nrow++,      "Accepted");

    // }

    
    
    // TODO: 
    // Add a new statistics histo containing only the tokens actually used in the selection

    Int_t count = fCollTrigClasses.GetEntries() + fBGTrigClasses.GetEntries();
    
    for (Int_t i=0; i<count; i++)
    {
      
      AliTriggerAnalysis* triggerAnalysis = new AliTriggerAnalysis;
      triggerAnalysis->SetAnalyzeMC(fMC);
      triggerAnalysis->EnableHistograms();
      triggerAnalysis->SetSPDGFOThreshhold(1);
      triggerAnalysis->SetDoFMD(kFALSE);
      triggerAnalysis->SetCorrZDCCutParams(fTriggerOADB->GetZDCCutRefSumCorr(),
					   fTriggerOADB->GetZDCCutRefDeltaCorr(), 
					   fTriggerOADB->GetZDCCutSigmaSumCorr(),
					   fTriggerOADB->GetZDCCutSigmaDeltaCorr());
      fTriggerAnalysis.Add(triggerAnalysis);
    }

    
    // TODO: shall I really delete this?
    if (fHistStatistics[0])
      delete fHistStatistics[0];
    if (fHistStatistics[1])
      delete fHistStatistics[1];
  
    fHistStatistics[kStatIdxBin0] = BookHistStatistics("_Bin0");
    fHistStatistics[kStatIdxAll]  = BookHistStatistics("");
    

    if (fHistBunchCrossing)
      delete fHistBunchCrossing;
  
    fHistBunchCrossing = new TH2F("fHistBunchCrossing", "fHistBunchCrossing;bunch crossing number;", 4000, -0.5, 3999.5,  count, -0.5, -0.5 + count);

    // TODO: remove fHistTriggerPattern
    if (fHistTriggerPattern)
      delete fHistTriggerPattern;
    
    const int ntrig=3;
    Int_t n = 1;
    const Int_t nbinTrig = TMath::Nint(TMath::Power(2,ntrig));

    fHistTriggerPattern = new TH1F("fHistTriggerPattern", "Trigger pattern: FO + 2*v0A + 4*v0C", 
				   nbinTrig, -0.5, nbinTrig-0.5);    
    fHistTriggerPattern->GetXaxis()->SetBinLabel(1,"NO TRIG");
    fHistTriggerPattern->GetXaxis()->SetBinLabel(2,"FO");
    fHistTriggerPattern->GetXaxis()->SetBinLabel(3,"v0A");
    fHistTriggerPattern->GetXaxis()->SetBinLabel(4,"FO & v0A");
    fHistTriggerPattern->GetXaxis()->SetBinLabel(5,"v0C");
    fHistTriggerPattern->GetXaxis()->SetBinLabel(6,"FO & v0C");
    fHistTriggerPattern->GetXaxis()->SetBinLabel(7,"v0A & v0C");
    fHistTriggerPattern->GetXaxis()->SetBinLabel(8,"FO & v0A & v0C");

  
    n = 1;
    for (Int_t i=0; i < fCollTrigClasses.GetEntries(); i++)
    {
      
      fHistBunchCrossing->GetYaxis()->SetBinLabel(n, ((TObjString*) fCollTrigClasses.At(i))->String());
      n++;
    }
    for (Int_t i=0; i < fBGTrigClasses.GetEntries(); i++)
    {
      
      fHistBunchCrossing->GetYaxis()->SetBinLabel(n, ((TObjString*) fBGTrigClasses.At(i))->String());
      n++;
    }

    

  }
    
  Int_t count = fCollTrigClasses.GetEntries() + fBGTrigClasses.GetEntries();
  for (Int_t i=0; i<count; i++)
  {
    
    AliTriggerAnalysis* triggerAnalysis = static_cast<AliTriggerAnalysis*> (fTriggerAnalysis.At(i));
  
    switch (runNumber)
    {
      case 104315:
      case 104316:
      case 104320:
      case 104321:
      case 104439:
        triggerAnalysis->SetV0TimeOffset(7.5);
        break;
      default:
        triggerAnalysis->SetV0TimeOffset(0);
    }
  }
    
  fCurrentRun = runNumber;
  
  TH1::AddDirectory(oldStatus);
  
  
  return kTRUE;
}

TH2F * AliPhysicsSelection::BookHistStatistics(const char * tag) {
  // add 6 rows to count for the estimate of good, accidentals and
  // BG and the ratio of BG and accidentals to total +ratio goot to
  // first col + 2 for error on good.
  // TODO: Remember the the indexes of rows for the BG selection. Add new member fBGRows[] and use kStat as indexes

  Int_t count = fCollTrigClasses.GetEntries() + fBGTrigClasses.GetEntries();
#ifdef VERBOSE_STAT
  Int_t extrarows = fComputeBG != 0 ? 11 : 0;
#else
  Int_t extrarows = fComputeBG != 0 ? 6 : 0;
#endif
  TH2F * h = new TH2F(Form("fHistStatistics%s",tag), Form("fHistStatistics - %s ;;",tag), kStatAccepted, 0.5, kStatAccepted+0.5, count+extrarows, -0.5, -0.5 + count+extrarows);

  h->GetXaxis()->SetBinLabel(kStatTriggerClass,  "Trigger class");
  h->GetXaxis()->SetBinLabel(kStatHWTrig,	 "Hardware trigger");
  h->GetXaxis()->SetBinLabel(kStatFO1,	         "FO >= 1");
  h->GetXaxis()->SetBinLabel(kStatFO2,	         "FO >= 2");
  h->GetXaxis()->SetBinLabel(kStatFO2L1,         "FO (L1) >= 2");
  h->GetXaxis()->SetBinLabel(kStatV0A,	         "V0A");
  h->GetXaxis()->SetBinLabel(kStatV0C,	         "V0C");
  h->GetXaxis()->SetBinLabel(kStatT0BB,	         "T0");
  h->GetXaxis()->SetBinLabel(kStatT0BG,	         "T0BG");
  h->GetXaxis()->SetBinLabel(kStatT0PileUp,      "T0 PileUp");
  h->GetXaxis()->SetBinLabel(kStatLaserCut,      "TPC Laser Wup Cut");
  h->GetXaxis()->SetBinLabel(kStatV0ABG,	 "V0A BG");
  h->GetXaxis()->SetBinLabel(kStatV0CBG,	 "V0C BG");
  h->GetXaxis()->SetBinLabel(kStatZDCA,          "ZDCA");
  h->GetXaxis()->SetBinLabel(kStatZDCC,          "ZDCC");
  h->GetXaxis()->SetBinLabel(kStatZDCAC,         "ZDCA & ZDCC");
  h->GetXaxis()->SetBinLabel(kStatZDCTime,       "ZDC Time Cut");
  h->GetXaxis()->SetBinLabel(kStatMB1,	         "(FO >= 1 | V0A | V0C) & !V0 BG");
  h->GetXaxis()->SetBinLabel(kStatMB1Prime,      "(FO >= 2 | (FO >= 1 & (V0A | V0C)) | (V0A &v0C) ) & !V0 BG");
  //h->GetXaxis()->SetBinLabel(kStatFO1AndV0,	 "FO >= 1 & (V0A | V0C) & !V0 BG");
  h->GetXaxis()->SetBinLabel(kStatV0,	         "V0A & V0C & !V0 BG & !BG ID");
  h->GetXaxis()->SetBinLabel(kStatOffline,	 "Offline Trigger");
  //h->GetXaxis()->SetBinLabel(kStatAny2Hits,	 "2 Hits & !V0 BG");
  h->GetXaxis()->SetBinLabel(kStatBG,	         "Background identification");
  h->GetXaxis()->SetBinLabel(kStatAcceptedPileUp, "Pile up (in accepted)");
  h->GetXaxis()->SetBinLabel(kStatAccepted,      "Accepted");


  Int_t n = 1;
  for (Int_t i=0; i < fCollTrigClasses.GetEntries(); i++)
    {
      h->GetYaxis()->SetBinLabel(n, ((TObjString*) fCollTrigClasses.At(i))->String());
      n++;
    }
  for (Int_t i=0; i < fBGTrigClasses.GetEntries(); i++)
    {
      h->GetYaxis()->SetBinLabel(n, ((TObjString*) fBGTrigClasses.At(i))->String());
      n++;
    }

  if(fComputeBG) {
    fBGStatOffset = n;
    h->GetYaxis()->SetBinLabel(n++, "All B");
    h->GetYaxis()->SetBinLabel(n++, "All A+C");
    h->GetYaxis()->SetBinLabel(n++, "All E");
    h->GetYaxis()->SetBinLabel(n++, Form("BG (A+C) (Mask [0x%x])", fComputeBG));
    h->GetYaxis()->SetBinLabel(n++, "ACC");
#ifdef VERBOSE_STAT
    h->GetYaxis()->SetBinLabel(n++, "BG (A+C) %  (rel. to CINT1B)");
    h->GetYaxis()->SetBinLabel(n++, "ACC % (rel. to CINT1B)");
    h->GetYaxis()->SetBinLabel(n++, "ERR GOOD %");
    h->GetYaxis()->SetBinLabel(n++, "GOOD % (rel. to 1st col)");
    h->GetYaxis()->SetBinLabel(n++, "ERR GOOD");
#endif
    h->GetYaxis()->SetBinLabel(n++, "GOOD");
  }

  return h;
}

void AliPhysicsSelection::Print(const Option_t *option) const
{
  // print the configuration
  TString msg;
  Printf("Configuration initialized for run %d (MC: %d):", fCurrentRun, fMC);
  msg += Form("Configuration initialized for run %d (MC: %d):\n", fCurrentRun, fMC);
  
  Printf("Collision trigger classes:");
  for (Int_t i=0; i < fCollTrigClasses.GetEntries(); i++)
    Printf("%s", ((TObjString*) fCollTrigClasses.At(i))->String().Data());
  
  Printf("Background trigger classes:");
  for (Int_t i=0; i < fBGTrigClasses.GetEntries(); i++)
    Printf("%s", ((TObjString*) fBGTrigClasses.At(i))->String().Data());

  AliTriggerAnalysis* triggerAnalysis = dynamic_cast<AliTriggerAnalysis*> (fTriggerAnalysis.At(0));
  
  if (triggerAnalysis)
  {
    if (triggerAnalysis->GetV0TimeOffset() > 0)
      Printf("V0 time offset active: %.2f ns", triggerAnalysis->GetV0TimeOffset());
    
    Printf("\nTotal available events:");
    
    triggerAnalysis->PrintTriggerClasses();
    // Check if all triggers with counts are known to the physics selection. If not, print a WARNING (only for MC) 
    if(!fMC) {
      TMap * triggers = triggerAnalysis->GetTriggerClasses();
      TIterator* iter = triggers->MakeIterator();
      TObjString* obj = 0;
      static TString alreadyFoundTriggers;
      while ((obj = dynamic_cast<TObjString*> (iter->Next())))
	{
	  TString strTrigger = obj->GetString();    
	  TParameter<Long64_t>* param = static_cast<TParameter<Long64_t>*> (triggers->GetValue(obj));
	  Long_t counts =  (Long_t)param->GetVal();
	  TObjArray* tokens = obj->String().Tokenize(" ");
	  for (Int_t i=0; i<tokens->GetEntries(); i++)
	    {
	      TString singleTrigStr = ((TObjString*) tokens->At(i))->String();
	      singleTrigStr.Strip(TString::kBoth, ' ' );
	      const char * singleTrig = singleTrigStr.Data();
	      //	    Printf("%s", singleTrig);
	      TString singleTrigStrFull;
	      Bool_t found = kFALSE;
	      Int_t nCollTriggers = fCollTrigClasses.GetEntries();
	      for(Int_t iCollTriggers = 0; iCollTriggers < nCollTriggers; iCollTriggers++){
		singleTrigStrFull = ((TObjString*)fCollTrigClasses.At(iCollTriggers))->String();
		if(singleTrigStrFull.Contains(singleTrigStr)) {
		  found = kTRUE;
		  break;
		}
		singleTrigStrFull = singleTrigStr;
	      }
	      Int_t nBGTriggers = fBGTrigClasses.GetEntries();
	      for(Int_t iBGTriggers = 0; iBGTriggers < nBGTriggers; iBGTriggers++){
		singleTrigStrFull = ((TObjString*)fBGTrigClasses.At(iBGTriggers))->String();
		if(singleTrigStrFull.Contains(singleTrigStr)) {
		  found = kTRUE;
		  break;
		}
		singleTrigStrFull = singleTrigStr;
	      }
	      
	      TString blacklist = "CEMC7WU-B-NOPF-ALL, CEMC7WU-AC-NOPF-ALL CEMC7WU-E-NOPF-ALL C0LSR-ABCE-NOPF-TPC CBEAMB-B-NOPF-ALLNOTRD"; // We know we dont support those, so we print no warning	      
	      if(counts>0 && !found && !blacklist.Contains(singleTrig) && !singleTrigStr.Contains("WU") && !alreadyFoundTriggers.Contains(singleTrig)) {
		Printf("WARNING: Found unknown trigger [%s] with %ld counts in the ESD!", singleTrig, counts);
		alreadyFoundTriggers += singleTrig; // Avoid printing warning twice for the same trigger
	      }	      
	    }    
	  delete tokens;	
	}
      delete iter;
    }
  }
  
  if (fHistStatistics[kStatIdxAll])
  {
    static TString alreadyFoundTriggers; // avoids printing twice the same warning
	
    for (Int_t i=0; i<fCollTrigClasses.GetEntries(); i++)
    {
      Printf("\nSelection statistics for collision trigger %s:", ((TObjString*) fCollTrigClasses.At(i))->String().Data());
      msg += Form("\nSelection statistics for collision trigger %s:\n", ((TObjString*) fCollTrigClasses.At(i))->String().Data());
      
      Float_t allEvents       = fHistStatistics[kStatIdxAll]->GetBinContent(1, i+1); 
      Float_t triggeredEvents = fHistStatistics[kStatIdxAll]->GetBinContent(fHistStatistics[kStatIdxAll]->GetXaxis()->FindBin("Accepted"), i+1); 

      Printf("Total events with correct trigger class: %d", (Int_t) fHistStatistics[kStatIdxAll]->GetBinContent(1, i+1));
      msg += Form("Total events with correct trigger class: %d\n", (Int_t) fHistStatistics[kStatIdxAll]->GetBinContent(1, i+1));
      Printf("Selected collision candidates: %d", (Int_t) fHistStatistics[kStatIdxAll]->GetBinContent(fHistStatistics[kStatIdxAll]->GetXaxis()->FindBin("Accepted"), i+1));
      msg += Form("Selected collision candidates: %d\n", (Int_t) fHistStatistics[kStatIdxAll]->GetBinContent(fHistStatistics[kStatIdxAll]->GetXaxis()->FindBin("Accepted"), i+1));
      
      // If the fraction of accepted events is too low, print a warning.
      Float_t eff = allEvents > 0 ? triggeredEvents/allEvents : 0;
      if(allEvents > 0 && (eff < 0.5) &&  // FIXME: make threshold programmable in OADB
	 !alreadyFoundTriggers.Contains(((TObjString*) fCollTrigClasses.At(i))->String().Data())) {
	Printf("WARNING: Trigger class %s has a very low efficiency (%d/%d=%.2f)",((TObjString*) fCollTrigClasses.At(i))->String().Data(), (Int_t) triggeredEvents, (Int_t) allEvents, eff);
	alreadyFoundTriggers += ((TObjString*) fCollTrigClasses.At(i))->String().Data();
	Printf("%s", alreadyFoundTriggers.Data());
      }

    }
  }
  
  if (fHistBunchCrossing)
  {
    Printf("\nBunch crossing statistics:");
    msg += "\nBunch crossing statistics:\n";
    
    for (Int_t i=1; i<=fHistBunchCrossing->GetNbinsY(); i++)
    {
      TString str;
      str.Form("Trigger %s has events in the bunch crossings: ", fHistBunchCrossing->GetYaxis()->GetBinLabel(i));
      
      for (Int_t j=1; j<=fHistBunchCrossing->GetNbinsX(); j++)
        if (fHistBunchCrossing->GetBinContent(j, i) > 0)
          str += Form("%d, ", (Int_t) fHistBunchCrossing->GetXaxis()->GetBinCenter(j));
             
      Printf("%s", str.Data());
      msg += str;
      msg += "\n";
    }
    
    for (Int_t j=1; j<=fHistBunchCrossing->GetNbinsX(); j++)
    {
      Int_t countColl = 0;
      Int_t countBG = 0;
      for (Int_t i=1; i<=fHistBunchCrossing->GetNbinsY(); i++)
      {
        if (fHistBunchCrossing->GetBinContent(j, i) > 0)
        {
          if (fCollTrigClasses.FindObject(fHistBunchCrossing->GetYaxis()->GetBinLabel(i)))
            countColl++;
          if (fBGTrigClasses.FindObject(fHistBunchCrossing->GetYaxis()->GetBinLabel(i)))
            countBG++;
        }
      }
      if (countColl > 0 && countBG > 0)
        Printf("WARNING: Bunch crossing %d has collision and BG trigger classes active. Check BPTX functioning for this run!", (Int_t) fHistBunchCrossing->GetXaxis()->GetBinCenter(j));
    }
  }

  if (fUsingCustomClasses)        
    Printf("WARNING: Using custom trigger classes!");
  if (fSkipTriggerClassSelection) 
    Printf("WARNING: Skipping trigger class selection!");
  if (fSkipV0) 
    Printf("WARNING: Ignoring V0 information in selection");
  if(!fBin0CallBack) 
    Printf("WARNING: Callback not set: will not fill the statistics for the bin 0");
  TString opt(option);
  opt.ToUpper();
  if (opt == "STAT") {
     AliAnalysisManager *mgr = AliAnalysisManager::GetAnalysisManager();
     if (mgr) mgr->AddStatisticsMsg(msg);
  }
}

Long64_t AliPhysicsSelection::Merge(TCollection* list)
{
  // Merge a list of AliMultiplicityCorrection objects with this (needed for
  // PROOF).
  // Returns the number of merged objects (including this).

  if (!list)
    return 0;

  if (list->IsEmpty())
    return 1;

  TIterator* iter = list->MakeIterator();
  TObject* obj;
  
  // collections of all histograms
  const Int_t nHists = 8;
  TList collections[nHists];

  Int_t count = 0;
  while ((obj = iter->Next())) {

    AliPhysicsSelection* entry = dynamic_cast<AliPhysicsSelection*> (obj);
    if (entry == 0) 
      continue;
    // Update run number. If this one is not initialized (-1) take the one from 
    // the next physics selection to be merged with. In case of 2 different run
    // numbers issue a warning (should physics selections from different runs be 
    // merged together) A.G.
    Int_t currentRun = entry->GetCurrentRun();
    // Nothing to merge with since run number was not initialized.
    if (currentRun < 0) continue;
    if (fCurrentRun < 0) 
    {
      fCurrentRun = currentRun;
      fMC = entry->fMC;
      for (Int_t i=0; i<entry->fCollTrigClasses.GetEntries(); i++)
        fCollTrigClasses.Add(entry->fCollTrigClasses.At(i)->Clone());
      for (Int_t i=0; i<entry->fBGTrigClasses.GetEntries(); i++)
        fBGTrigClasses.Add(entry->fBGTrigClasses.At(i)->Clone());
    }
    if (fCurrentRun != currentRun)
       AliWarning(Form("Current run %d not matching the one to be merged with %d", fCurrentRun, currentRun));

    // With the same strategy update fBGStatOffset
    Int_t bgstatoffset = entry->GetBGStatOffset();
    
    // Nothing to merge with since BG was not initialized.
    if (!(bgstatoffset < 0)){
      if (fBGStatOffset < 0) 
	{
	  fBGStatOffset = bgstatoffset;
	}
    }
    if (fBGStatOffset != bgstatoffset)
      AliWarning(Form("Current run %d not matching the one to be merged with %d", fBGStatOffset, bgstatoffset));
    

    
    // Merge the OADBs (Take just the first instance you find
    if (!fPSOADB && entry->GetOADBPhysicsSelection()) {
      fPSOADB = (AliOADBPhysicsSelection*) entry->GetOADBPhysicsSelection()->Clone();
    }
    if (!fFillOADB && entry->GetOADBFillingScheme()){
      fFillOADB = (AliOADBFillingScheme*) entry->GetOADBFillingScheme()->Clone();
    }

    if (entry->fTriggerAnalysis.GetEntries() > 0)
      collections[0].Add(&(entry->fTriggerAnalysis));
    if (entry->fHistStatistics[0])
      collections[1].Add(entry->fHistStatistics[0]);
    if (entry->fHistStatistics[1])
      collections[2].Add(entry->fHistStatistics[1]);
    // if (entry->fHistStatisticsTokens)
    //   collections[3].Add(entry->fHistStatisticsTokens);
    if (entry->fHistBunchCrossing)
      collections[3].Add(entry->fHistBunchCrossing);
    if (entry->fHistTriggerPattern)
      collections[4].Add(entry->fHistTriggerPattern);

    count++;
  }

  if (fTriggerAnalysis.GetEntries() == 0 && collections[0].GetEntries() > 0)
  {
    TList* firstList = (TList*) collections[0].First();
    for (Int_t i=0; i<firstList->GetEntries(); i++)
      fTriggerAnalysis.Add(firstList->At(i)->Clone());
    
    collections[0].RemoveAt(0);
  }
  fTriggerAnalysis.Merge(&collections[0]);
  
  // if this instance is empty (not initialized) nothing would be merged here --> copy first entry
  if (!fHistStatistics[0] && collections[1].GetEntries() > 0)
  {
    fHistStatistics[0] = (TH2F*) collections[1].First()->Clone();
    collections[1].RemoveAt(0);
  }
  if (fHistStatistics[0])
    fHistStatistics[0]->Merge(&collections[1]);
    
  if (!fHistStatistics[1] && collections[2].GetEntries() > 0)
  {
    fHistStatistics[1] = (TH2F*) collections[2].First()->Clone();
    collections[2].RemoveAt(0);
  }
  if (fHistStatistics[1])
    fHistStatistics[1]->Merge(&collections[2]);
    
  if (!fHistBunchCrossing && collections[3].GetEntries() > 0)
  {
    fHistBunchCrossing = (TH2F*) collections[3].First()->Clone();
    collections[3].RemoveAt(0);
  }
  if (fHistBunchCrossing)
    fHistBunchCrossing->Merge(&collections[3]);
  
  if (!fHistTriggerPattern && collections[4].GetEntries() > 0)
  {
    fHistTriggerPattern = (TH1F*) collections[4].First()->Clone();
    collections[4].RemoveAt(0);
  }
  if (fHistTriggerPattern)
    fHistTriggerPattern->Merge(&collections[4]);
    
  delete iter;

  return count+1;
}

void AliPhysicsSelection::SaveHistograms(const char* folder) 
{
  // write histograms to current directory
  
  if (!fHistStatistics[0] || !fHistStatistics[1])
    return;
    
  if (folder)
  {
    gDirectory->mkdir(folder);
    gDirectory->cd(folder);
  }
  

  // Fill the last rows of fHistStatistics before saving
  if (fComputeBG) {      
    AliInfo("BG estimate assumes that for a given run you only have A and C triggers separately or"
	    " toghether as a AC class! Make sure this assumption holds in your case"); 
    
    // use an anum for the different trigger classes, to make loops easier to read
    enum {kClassB =0 , kClassA, kClassC, kClassAC, kClassE, kNClasses};
    const char * classFlags[] = {"B", "A", "C", "AC", "E"}; // labels
    
    UInt_t * rows[kNClasses] = {0}; // Array of matching rows
    Int_t nrows[kNClasses] = {0};
    // Get rows matching the requested trigger bits for all trigger classes
    for(Int_t iTrigClass = 0; iTrigClass < kNClasses; iTrigClass++){
      nrows[iTrigClass] = GetStatRow(classFlags[iTrigClass],fComputeBG,&rows[iTrigClass]);	
    }
    
    // 0. Determine the ratios of triggers E/B, A/B, C/B from the stat histogram
    // Those are used to rescale the different classes to the same number of bx ids
    // TODO: pass names of the rows for B, CA and E and look names of the rows. How do I handle the case in which both AC are in the same row?         
    Int_t nBXIds[kNClasses] = {0};
      //      cout <<"Computing BG:" << endl;
    
    for(Int_t iTrigClass = 0; iTrigClass < kNClasses; iTrigClass++){
      for(Int_t irow = 0; irow < nrows[iTrigClass]; irow++) {
	if(irow==0) cout << "- Class " << classFlags[iTrigClass] << endl;   
	for (Int_t j=1; j<=fHistBunchCrossing->GetNbinsX(); j++) {
	  if (fHistBunchCrossing->GetBinContent(j, rows[iTrigClass][irow]) > 0) {
	    nBXIds[iTrigClass]++;	 
	  }
	}
	if(nBXIds[iTrigClass]>0) cout << "   Using row " << rows[iTrigClass][irow] <<  ": " 
				      << fHistBunchCrossing->GetYaxis()->GetBinLabel(rows[iTrigClass][irow]) 
				      << " (nBXID "<< nBXIds[iTrigClass] << ")"<< endl;

      }

    }

    Float_t ratioToB[kNClasses];
    ratioToB[kClassE]  = nBXIds[kClassE]  >0 ? Float_t(nBXIds[kClassB])/nBXIds[kClassE]   : 0;
    ratioToB[kClassA]  = nBXIds[kClassA]  >0 ? Float_t(nBXIds[kClassB])/nBXIds[kClassA]   : 0;
    ratioToB[kClassC]  = nBXIds[kClassC]  >0 ? Float_t(nBXIds[kClassB])/nBXIds[kClassC]   : 0;
    ratioToB[kClassAC] = nBXIds[kClassAC] >0 ? Float_t(nBXIds[kClassB])/nBXIds[kClassAC]  : 0;
    Printf("Ratio between the BX ids in the different trigger classes:");
    Printf("  B/E  = %d/%d = %f", nBXIds[kClassB],nBXIds[kClassE], ratioToB[kClassE] );
    Printf("  B/A  = %d/%d = %f", nBXIds[kClassB],nBXIds[kClassA], ratioToB[kClassA] );
    Printf("  B/C  = %d/%d = %f", nBXIds[kClassB],nBXIds[kClassC], ratioToB[kClassC] );
    Printf("  B/AC = %d/%d = %f", nBXIds[kClassB],nBXIds[kClassAC],ratioToB[kClassAC]);
    Int_t nHistStat = 2;

    // 1. loop over all cols
    for(Int_t iHistStat = 0; iHistStat < nHistStat; iHistStat++){
      Int_t ncol = fHistStatistics[iHistStat]->GetNbinsX();
      Float_t good1 = 0;      
      for(Int_t icol = 1; icol <= ncol; icol++) {
	Int_t nEvents[kNClasses] = {0}; // number of events should be reset at every column
	// For all trigger classes, add up over row matching trigger mask (as selected before)
	for(Int_t iTrigClass = 0; iTrigClass < kNClasses; iTrigClass++){
	  for(Int_t irow = 0; irow < nrows[iTrigClass]; irow++) {	  
	    nEvents[iTrigClass] += (Int_t) fHistStatistics[iHistStat]->GetBinContent(icol,rows[iTrigClass][irow]);	
	  }
	  //	    cout << "Events " << classFlags[iTrigClass] << " ("<<icol<<") " << nEvents[iTrigClass] << endl;	    
	}
	if (nEvents[kClassB]>0) {
	  Float_t acc  = ratioToB[kClassE]*nEvents[kClassE]; 
	  Double_t accErr = TMath::Sqrt(ratioToB[kClassE]*ratioToB[kClassE]*nEvents[kClassE]);
	  //      Int_t bg   = cint1A + cint1C - 2*acc;
	    
	  // If intensity measurements are available, they already
	  // contain the scaling for BX ratios, so we reset the
	  // ratioToB entries
	  if(icol == 1) {
	    if(fBIFactorAC > 0 || fBIFactorA > 0 || fBIFactorC > 0) {
	      if (fBIFactorAC <= 0 && (fBIFactorA <= 0 || fBIFactorC <= 0)) {
		AliError("Not all intensities set!, assuming equal intensities");
		fBIFactorA  = 1;
		fBIFactorC  = 1;
		fBIFactorAC = 1;
	      } else {
		AliInfo("Using ratio of number of bunch crossing embedded in the intensity measurements");
		ratioToB[kClassA]  = ratioToB[kClassA]  >0 ? 1  : 0;
		ratioToB[kClassC]  = ratioToB[kClassC]  >0 ? 1  : 0;
		ratioToB[kClassAC] = ratioToB[kClassAC] >0 ? 1  : 0;
		AliInfo(Form(" - BI Factor A:  %f",  fBIFactorA ));
		AliInfo(Form(" - BI Factor C:  %f",  fBIFactorC ));
		AliInfo(Form(" - BI Factor AC: %f",  fBIFactorAC ));
		
	      }
	    } else {
	      AliWarning("Intensities not set!, assuming equal intensities");
	      fBIFactorA  = 1;
	      fBIFactorC  = 1;
	      fBIFactorAC = 1;
	    }
	  }
	  // Assuming that for a given class the triggers are either recorded as A+C or AC
	  Float_t bg  = nEvents[kClassAC] > 0 ?
	    fBIFactorAC*(ratioToB[kClassAC]*nEvents[kClassAC] - 2*acc):
	    fBIFactorA* (ratioToB[kClassA]*nEvents[kClassA]-acc) + 
	    fBIFactorC* (ratioToB[kClassC]*nEvents[kClassC]-acc) ;

	  // cout << "-----------------------" << endl;
	  // cout << "Factors: " << fBIFactorA << " " << fBIFactorC << " " << fBIFactorAC << endl;
	  // cout << "Ratios: "  << ratioToB[kClassA] << " " << ratioToB[kClassC] << " " << ratioToB[kClassAC] << endl;
	  // cout << "Evts:   "  << nEvents[kClassA] << " " << nEvents[kClassC] << " " << nEvents[kClassAC] << " " <<  nEvents[kClassB] << endl;
	  // cout << "Acc: " << acc << endl;
	  // cout << "BG: " << bg << endl;
	  // cout  << "  " <<   fBIFactorA* (ratioToB[kClassA]*nEvents[kClassA]-acc) <<endl;
	  // cout  << "  " <<   fBIFactorC* (ratioToB[kClassC]*nEvents[kClassC]-acc) <<endl;
	  // cout  << "  " <<   fBIFactorAC*(ratioToB[kClassAC]*nEvents[kClassAC] - 2*acc) << endl;
	  // cout << "-----------------------" << endl;

	  Float_t good = Float_t(nEvents[kClassB]) - bg - acc;
	  if (icol ==1) good1 = good;
	  //      Float_t errGood     = TMath::Sqrt(2*(nEvents[kClassA]+nEvents[kClassC]+nEvents[kClassE]));// Error on the number of goods assuming only bg fluctuates
	  //      DeltaG^2 = B + FA^2 A + FC^2 C + Ratio^2 (FA+FC-1)^2 E.
	  Float_t errGood     = nEvents[kClassAC] > 0 ? 
	    TMath::Sqrt( nEvents[kClassB] +
			 fBIFactorAC*fBIFactorAC*ratioToB[kClassAC]*ratioToB[kClassAC]*nEvents[kClassAC] +
			 ratioToB[kClassE] * ratioToB[kClassE] * 
			 (fBIFactorAC - 1)*(fBIFactorAC - 1)*nEvents[kClassE]) :  
	    TMath::Sqrt( nEvents[kClassB] + 
			 fBIFactorA*fBIFactorA*ratioToB[kClassA]*ratioToB[kClassA]*nEvents[kClassA] +
			 fBIFactorC*fBIFactorC*ratioToB[kClassC]*ratioToB[kClassC]*nEvents[kClassC] +
			 ratioToB[kClassE] * ratioToB[kClassE] * 
			 (fBIFactorA + fBIFactorC - 1)*(fBIFactorA + fBIFactorC - 1)*nEvents[kClassE]);

	  Float_t errBG = nEvents[kClassAC] > 0 ? 
	    TMath::Sqrt(fBIFactorAC*fBIFactorAC*ratioToB[kClassAC]*ratioToB[kClassAC]*nEvents[kClassAC]+
			4*ratioToB[kClassE]*ratioToB[kClassE]*(fBIFactorAC*fBIFactorAC)*nEvents[kClassE]) :
	    TMath::Sqrt(fBIFactorA*fBIFactorA*ratioToB[kClassA]*ratioToB[kClassA]*nEvents[kClassA]+
			fBIFactorC*fBIFactorC*ratioToB[kClassC]*ratioToB[kClassC]*nEvents[kClassC]+
			ratioToB[kClassE]*ratioToB[kClassE]*(fBIFactorA+fBIFactorC)*(fBIFactorA+fBIFactorC)*nEvents[kClassE]);
	
	
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowAllB, nEvents[kClassB]);	
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowAllAC,nEvents[kClassA]+nEvents[kClassC]+nEvents[kClassAC]);	
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowAllE, nEvents[kClassE]);	

	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowBG,bg);	
	  fHistStatistics[iHistStat]->SetBinError  (icol,fBGStatOffset+kStatRowBG,errBG);	
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowAcc,acc);	
	  fHistStatistics[iHistStat]->SetBinError  (icol,fBGStatOffset+kStatRowAcc,accErr);	
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowGood,good);    
	  fHistStatistics[iHistStat]->SetBinError  (icol,fBGStatOffset+kStatRowGood,errGood);    

#ifdef VERBOSE_STAT
	  //kStatRowBG=0,kStatRowAcc,kStatRowBGFrac,kStatRowAccFrac,kStatRowErrGoodFrac,kStatRowGoodFrac,kStatRowGood,kStatRowErrGood
	  Float_t accFrac   = Float_t(acc) / nEvents[kClassB]  *100;
	  Float_t errAccFrac= Float_t(accErr) / nEvents[kClassB]  *100;
	  Float_t bgFrac    = Float_t(bg)  / nEvents[kClassB]  *100;
	  Float_t goodFrac  = Float_t(good)  / good1 *100;
	  Float_t errGoodFrac = errGood/good1 * 100;
	  Float_t errFracBG = bg > 0 ? TMath::Sqrt((errBG/bg)*(errBG/bg) + 1/nEvents[kClassB])*bgFrac : 0;
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowBGFrac,bgFrac);	
	  fHistStatistics[iHistStat]->SetBinError  (icol,fBGStatOffset+kStatRowBGFrac,errFracBG);	
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowAccFrac,accFrac);    
	  fHistStatistics[iHistStat]->SetBinError  (icol,fBGStatOffset+kStatRowAccFrac,errAccFrac);    
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowGoodFrac,goodFrac);    
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowErrGoodFrac,errGoodFrac);    
	  fHistStatistics[iHistStat]->SetBinContent(icol,fBGStatOffset+kStatRowErrGood,errGood);    
#endif
	}
      }
    }
    for (Int_t iTrigClass = 0; iTrigClass < kNClasses; iTrigClass++){
      delete [] rows[iTrigClass];
    }  
  }  

  fHistStatistics[0]->Write();
  fHistStatistics[1]->Write();
  if(fHistBunchCrossing ) fHistBunchCrossing ->Write();
  if(fHistTriggerPattern) fHistTriggerPattern->Write();
  
  Int_t count = fCollTrigClasses.GetEntries() + fBGTrigClasses.GetEntries();
  for (Int_t i=0; i < count; i++)
    {
      TString triggerClass = "trigger_histograms_";
      if (i < fCollTrigClasses.GetEntries())
	triggerClass += ((TObjString*) fCollTrigClasses.At(i))->String();
      else
	triggerClass += ((TObjString*) fBGTrigClasses.At(i - fCollTrigClasses.GetEntries()))->String();
      
      gDirectory->mkdir(triggerClass);
      gDirectory->cd(triggerClass);
      
      static_cast<AliTriggerAnalysis*> (fTriggerAnalysis.At(i))->SaveHistograms();
      
      gDirectory->cd("..");
    }
    
  if (folder)
    gDirectory->cd("..");
  
}

Int_t AliPhysicsSelection::GetStatRow(const char * triggerBXClass, UInt_t offlineTriggerType, UInt_t ** rowIDs) const {
  // Puts inside the array rowIDs the row number for a given offline
  // trigger in a given bx class. Returns the total number of lines
  // matching the selection
  // triggerBXClass can be either "A", "AC", "B" or "E"
  // offlineTriggerType is one of the types defined in AliVEvent
  // User should delete rowIDs if no longer needed

  if(!fHistStatistics[0]) {
    AliWarning("Not initialized, returning 0");
    return 0;
  }
  const Int_t nrows = fHistStatistics[0]->GetNbinsY();

  // allocate memory for at maximum nrows
  Int_t nMatches = 0;
  (*rowIDs) = new UInt_t[nrows];


  // Loop over rows and find matching ones, using the PS OADB
  // FIXME: check BG estimates
  for(Int_t irow = 1; irow <= nrows; irow++){
    TString triggerClassCurrent = fHistStatistics[0]->GetYaxis()->GetBinLabel(irow);
    TPRegexp trigType (".*\\&(\\d+).*");
    TObjArray * arr = trigType.MatchS(triggerClassCurrent.Data());
    if(arr->GetEntries() > 1){
      UInt_t tType = ((TObjString*)arr->At(1))->GetString().Atoi();
      
      if (tType == offlineTriggerType && fPSOADB->GetBeamSide(triggerClassCurrent.Data()) == triggerBXClass) {
 	(*rowIDs)[nMatches] = irow;
	nMatches++;
      }

    }
    delete arr;

  }
  
  return nMatches;
}

void AliPhysicsSelection::SetBIFactors(const AliESDEvent * aESD) {
  // Set factors for realtive bunch intesities
  if(!aESD) { 
    AliFatal("ESD not given");
  }
  Int_t run = aESD->GetRunNumber();
  if (run > 105268) {
    // intensities stored in the ESDs
    const AliESDRun* esdRun = aESD->GetESDRun();
    Double_t intAB = esdRun->GetMeanIntensityIntecting(0);
    Double_t intCB = esdRun->GetMeanIntensityIntecting(1);
    Double_t intAA = esdRun->GetMeanIntensityNonIntecting(0);
    Double_t intCC = esdRun->GetMeanIntensityNonIntecting(1);

    // cout << "INT " <<intAB <<endl;
    // cout << "INT " <<intCB <<endl;
    // cout << "INT " <<intAA <<endl;
    // cout << "INT " <<intCC <<endl;

    if (intAB > 0 && intAA > 0) {
      fBIFactorA = intAB/intAA;
    } else {
      AliWarning("Cannot set fBIFactorA");
    }
    
    if (intCB > 0 && intCC > 0) {
      fBIFactorC = intCB/intCC;
    } else {
      AliWarning("Cannot set fBIFactorC");
    }
      
    if (intAB > 0 && intAA > 0 &&
	intCB > 0 && intCC > 0) {
      fBIFactorAC = (intAB+intCB)/(intAA+intCC);
    } else {
      AliWarning("Cannot set fBIFactorAC");
    }
        
  }  
  else {
    // First runs. Intensities hardcoded
    switch(run) {
    case 104155:
      fBIFactorA = 0.961912722908;
      fBIFactorC = 1.04992336081;
      break;
    case 104157:
      fBIFactorA = 0.947312854998;
      fBIFactorC = 1.01599706417;
      break;
    case 104159:
      fBIFactorA = 0.93659320151;
      fBIFactorC = 0.98580804207;
      break;
    case 104160:
      fBIFactorA = 0.929664189926;
      fBIFactorC = 0.963467679851;
      break;
    case 104315:
      fBIFactorA = 1.08939104979;
      fBIFactorC = 0.931113921925;
      break;
    case 104316:
      fBIFactorA = 1.08351880974;
      fBIFactorC = 0.916068345845;
      break;
    case 104320:
      fBIFactorA = 1.07669281245;
      fBIFactorC = 0.876818744763;
      break;
    case 104321:
      fBIFactorA = 1.00971079602;
      fBIFactorC = 0.773781299076;
      break;
    case 104792:
      fBIFactorA = 0.787215863962;
      fBIFactorC = 0.778253173071;
      break;
    case 104793:
      fBIFactorA = 0.692211363661;
      fBIFactorC = 0.733152456667;
      break;
    case 104799:
      fBIFactorA = 1.04027825161;
      fBIFactorC = 1.00530825942;
      break;
    case 104800:
      fBIFactorA = 1.05309910671;
      fBIFactorC = 1.00376801855;
      break;
    case 104801:
      fBIFactorA = 1.0531231922;
      fBIFactorC = 0.992439666758;
      break;
    case 104802:
      fBIFactorA = 1.04191478134;
      fBIFactorC = 0.979368585208;
      break;
    case 104803:
      fBIFactorA = 1.03121314094;
      fBIFactorC = 0.973379962609;
      break;
    case 104824:
      fBIFactorA = 0.969945926722;
      fBIFactorC = 0.39549745806;
      break;
    case 104825:
      fBIFactorA = 0.968627213937;
      fBIFactorC = 0.310100412205;
      break;
    case 104841:
      fBIFactorA = 0.991601393212;
      fBIFactorC = 0.83762204722;
      break;
    case 104845:
      fBIFactorA = 0.98040863886;
      fBIFactorC = 0.694824205793;
      break;
    case 104867:
      fBIFactorA = 1.10646173412;
      fBIFactorC = 0.841407246916;
      break;
    case 104876:
      fBIFactorA = 1.12063452421;
      fBIFactorC = 0.78726542895;
      break;
    case 104890:
      fBIFactorA = 1.02346137453;
      fBIFactorC = 1.03355663595;
      break;
    case 104892:
      fBIFactorA = 1.05406025913;
      fBIFactorC = 1.00029166135;
      break;
    case 105143:
      fBIFactorA = 0.947343384349;
      fBIFactorC = 0.972637444408;
      break;
    case 105160:
      fBIFactorA = 0.908854622177;
      fBIFactorC = 0.958851103977;
      break; 
    case 105256:
      fBIFactorA = 0.810076150206;
      fBIFactorC = 0.884663561883;
      break;
    case 105257:
      fBIFactorA = 0.80974912303;
      fBIFactorC = 0.878859123479;
      break;
    case 105268:
      fBIFactorA = 0.809052110679;
      fBIFactorC = 0.87233890989;
      break;
    default:
      fBIFactorA = 1;
      fBIFactorC = 1;
    }
  }

}

const char * AliPhysicsSelection::GetTriggerString(TObjString * obj) { 
  // Returns a formed objstring
  static TString retString;
  
  retString.Form("%s%s", 
		 obj->String().Data(), 
		 fUseBXNumbers ? fFillOADB->GetBXIDs(fPSOADB->GetBeamSide(obj->String().Data())) : ""  
		 );

  if (fMC) {
    TPRegexp stripClasses("\\+\\S* ");
    stripClasses.Substitute(retString,"","g");
    stripClasses=TPRegexp("\\-\\S* ");
    stripClasses.Substitute(retString,"","g");
  }

  return retString.Data();
}

void AliPhysicsSelection::AddCollisionTriggerClass(const char* className){
  AliError("This method is deprecated! Will be removed soon! Please use SetCustomOADBObjects() instead!");
  if(!fPSOADB) {
    fPSOADB = new AliOADBPhysicsSelection("CustomPS");   
    fPSOADB->SetHardwareTrigger         ( 0,"SPDGFO >= 1 || V0A || V0C");
    fPSOADB->SetOfflineTrigger          ( 0,"(SPDGFO >= 1 || V0A || V0C) && !V0ABG && !V0CBG");
  }

  // Strip all which is not needed, if BX ids are provided, they are still used here
  // offline trigger and logics are appended automagically, so we strip-em out if they are provided
  TString classNameStripped = className;
  if(classNameStripped.Index("*")>0)
    classNameStripped.Remove(classNameStripped.Index("*")); // keep only the class name (no bx, offline trigger...)   
  if(classNameStripped.Index("&")>0)
    classNameStripped.Remove(classNameStripped.Index("&")); // keep only the class name (no bx, offline trigger...)   

  fPSOADB->AddCollisionTriggerClass   ( AliVEvent::kUserDefined,classNameStripped.Data(),"B",0);
  
  fUsingCustomClasses = kTRUE;


}

void AliPhysicsSelection::AddBGTriggerClass(const char* className){
  // Add custom BG trigger class
 
  AliError("This method is deprecated! Will be removed soon! Please use SetCustomOADBObjects() instead!");
  if(!fPSOADB) {
    fPSOADB = new AliOADBPhysicsSelection("CustomPS");   
    fPSOADB->SetHardwareTrigger         ( 0,"SPDGFO >= 1 || V0A || V0C");
    fPSOADB->SetOfflineTrigger          ( 0,"(SPDGFO >= 1 || V0A || V0C) && !V0ABG && !V0CBG");
  }

  // Strip all which is not needed, if BX ids are provided, they are still used here
  // offline trigger and logics are appended automagically, so we strip-em out if they are provided
  TString classNameStripped = className;
  if(classNameStripped.Index("*")>0)
    classNameStripped.Remove(classNameStripped.Index("*")); // keep only the class name (no bx, offline trigger...)   
  if(classNameStripped.Index("&")>0)
    classNameStripped.Remove(classNameStripped.Index("&")); // keep only the class name (no bx, offline trigger...)   

  fPSOADB->AddBGTriggerClass   ( AliVEvent::kUserDefined,classNameStripped.Data(),"AC",0);

  fUsingCustomClasses = kTRUE;

}