[u/mrichter/AliRoot.git] / STEER / STEERBase / AliTRDPIDResponse.cxx

/**************************************************************************
* Copyright(c) 1998-1999, 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.                  *
**************************************************************************/
//
// PID Response class for the TRD detector
// Based on 1D Likelihood approach
// Calculation of probabilities using Bayesian approach
// Attention: This method is only used to separate electrons from pions
//
// Authors:
//  Markus Fasel <M.Fasel@gsi.de>
//  Anton Andronic <A.Andronic@gsi.de>
//
#include <TAxis.h>
#include <TClass.h>
#include <TDirectory.h>
#include <TFile.h>
#include <TH1.h>
#include <TKey.h>
#include <TMath.h>
#include <TObjArray.h>
#include <TROOT.h> 
#include <TString.h>
#include <TSystem.h>

#include "AliLog.h"
 
#include "AliVTrack.h"

#include "AliTRDPIDResponseObject.h"
#include "AliTRDPIDResponse.h"
//#include "AliTRDTKDInterpolator.h"
#include "AliTRDNDFast.h"
#include "AliTRDdEdxParams.h"

ClassImp(AliTRDPIDResponse)

//____________________________________________________________
AliTRDPIDResponse::AliTRDPIDResponse():
  TObject()
  ,fkPIDResponseObject(NULL)
  ,fkTRDdEdxParams(NULL)
  ,fGainNormalisationFactor(1.)
{
  //
  // Default constructor
  //
}

//____________________________________________________________
AliTRDPIDResponse::AliTRDPIDResponse(const AliTRDPIDResponse &ref):
  TObject(ref)
  ,fkPIDResponseObject(NULL)
  ,fkTRDdEdxParams(NULL)
  ,fGainNormalisationFactor(ref.fGainNormalisationFactor)
{
  //
  // Copy constructor
  //
}

//____________________________________________________________
AliTRDPIDResponse &AliTRDPIDResponse::operator=(const AliTRDPIDResponse &ref){
  //
  // Assignment operator
  //
  if(this == &ref) return *this;
  
  // Make copy
  TObject::operator=(ref);
  fGainNormalisationFactor = ref.fGainNormalisationFactor;
  fkPIDResponseObject = ref.fkPIDResponseObject;
  fkTRDdEdxParams = ref.fkTRDdEdxParams;

  return *this;
}

//____________________________________________________________
AliTRDPIDResponse::~AliTRDPIDResponse(){
  //
  // Destructor
  //
  if(IsOwner()) {
    delete fkPIDResponseObject;
    delete fkTRDdEdxParams;
  }
}

//____________________________________________________________
Bool_t AliTRDPIDResponse::Load(const Char_t * filename){
  //
  // Load References into the toolkit
  //
  AliDebug(1, "Loading reference histos from root file");
  TDirectory *owd = gDirectory;// store old working directory
  
  if(!filename)
    filename = Form("%s/STEER/LQ1dRef_v1.root",gSystem->ExpandPathName("$ALICE_ROOT"));
  TFile *in = TFile::Open(filename);
  if(!in){
    AliError("Ref file not available.");
    return kFALSE;
  }
  
  gROOT->cd();
  fkPIDResponseObject = dynamic_cast<const AliTRDPIDResponseObject *>(in->Get("TRDPIDResponse")->Clone());
  in->Close(); delete in;
  owd->cd();
  SetBit(kIsOwner, kTRUE);
  AliDebug(2, Form("Successfully loaded References for %d Momentum bins", fkPIDResponseObject->GetNumberOfMomentumBins()));
  return kTRUE;
}


//____________________________________________________________
Double_t AliTRDPIDResponse::GetNumberOfSigmas(const AliVTrack *track, AliPID::EParticleType type) const
{
  //
  //calculate the TRD nSigma
  //

  const Double_t badval = -9999;
  Double_t info[5]; for(int i=0; i<5; i++){info[i]=badval;}

  const Double_t delta = GetSignalDelta(track, type, kFALSE, info);

  const Double_t mean = info[0];
  const Double_t res = info[1];
  if(res<0){
    return badval;
  }

  const Double_t sigma = mean*res;
  const Double_t eps = 1e-12;
  return delta/(sigma + eps);
}

//____________________________________________________________
Double_t AliTRDPIDResponse::GetSignalDelta( const AliVTrack* track, AliPID::EParticleType type, Bool_t ratio/*=kFALSE*/, Double_t *info/*=0x0*/) const
{
  //
  //calculate the TRD signal difference w.r.t. the expected
  //output other information in info[]
  //

  const Double_t badval = -9999;

  //cut on number of chambers
  const Double_t cutch = 6;

  //cut on mean number of clusters per chamber
  const Double_t cutclsperch = 18;

  const Double_t nch = track->GetTRDNchamberdEdx();
  if(nch < cutch){
    return badval;
  }

  const Double_t ncls = track->GetTRDNclusterdEdx();
  if( ncls/nch < cutclsperch){
    return badval;
  }

  Double_t pTRD = -999;
  for(Int_t ich=0; ich<6; ich++){
    pTRD = track->GetTRDmomentum(ich);
    if(pTRD>0)
      break;
  }
  if(pTRD<0){
    return badval;
  }

  if(!fkTRDdEdxParams){
    AliError("fkTRDdEdxParams null");
    return -99999;
  }

  const Float_t *meanpar = (fkTRDdEdxParams->GetMeanParameter(type)).GetMatrixArray();
  const Float_t *respar  = (fkTRDdEdxParams->GetSigmaParameter(type)).GetMatrixArray();

  //============================================================================================<<<<<<<<<<<<<

  const Double_t bg = pTRD/AliPID::ParticleMass(type);
  const Double_t expsig = MeandEdxTR(&bg, meanpar);

  if(info){
    info[0]= expsig;
    info[1]= ResolutiondEdxTR(&ncls, respar);
  }

  const Double_t eps = 1e-10;

  if(ratio){
    return track->GetTRDsignal()/(expsig +  eps);
  }
  else{
    return track->GetTRDsignal() - expsig;
  }
}


Double_t AliTRDPIDResponse::ResolutiondEdxTR(const Double_t * xx,  const Float_t * par)
{
  //
  //resolution 
  //npar=3
  //

  const Double_t ncls = xx[0];

  return par[0]+par[1]*TMath::Power(ncls, par[2]);
}

Double_t AliTRDPIDResponse::MeandEdxTR(const Double_t * xx,  const Float_t * pin)
{
  //
  //ALEPH+LOGISTIC parametrization for dEdx+TR, in unit of MIP
  //npar = 8 = 3+5
  //

  Float_t ptr[4]={0};
  for(int ii=0; ii<3; ii++){
    ptr[ii+1]=pin[ii];
  }
  return MeanTR(xx,ptr) + MeandEdx(xx,&(pin[3]));
}

Double_t AliTRDPIDResponse::MeanTR(const Double_t * xx,  const Float_t * par)
{
  //
  //LOGISTIC parametrization for TR, in unit of MIP
  //npar = 4
  //
                                                                                                                                                                                                                                                        
  const Double_t bg = xx[0];
  const Double_t gamma = sqrt(1+bg*bg);

  const Double_t p0 = TMath::Abs(par[1]);
  const Double_t p1 = TMath::Abs(par[2]);
  const Double_t p2 = TMath::Abs(par[3]);

  const Double_t zz = TMath::Log(gamma);
  const Double_t tryield = p0/( 1 + TMath::Exp(-p1*(zz-p2)) );

  return par[0]+tryield;
}

Double_t AliTRDPIDResponse::MeandEdx(const Double_t * xx,  const Float_t * par)
{
  //
  //ALEPH parametrization for dEdx
  //npar = 5
  //

  const Double_t bg = xx[0];
  const Double_t beta = bg/TMath::Sqrt(1.+ bg*bg);

  const Double_t p0 = TMath::Abs(par[0]);
  const Double_t p1 = TMath::Abs(par[1]);

  const Double_t p2 = TMath::Abs(par[2]);

  const Double_t p3 = TMath::Abs(par[3]);
  const Double_t p4 = TMath::Abs(par[4]);

  const Double_t aa = TMath::Power(beta, p3);

  const Double_t bb = TMath::Log( p2 + TMath::Power(1./bg, p4) );

  return (p1-aa-bb)*p0/aa;

}


//____________________________________________________________
Int_t AliTRDPIDResponse::GetResponse(Int_t n, const Double_t * const dedx, const Float_t * const p, Double_t prob[AliPID::kSPECIES],ETRDPIDMethod PIDmethod,Bool_t kNorm) const
{
  //
  // Calculate TRD likelihood values for the track based on dedx and 
  // momentum values. The likelihoods are calculated by query the 
  // reference data depending on the PID method selected
  //
  // Input parameter :
  //   n - number of dedx slices/chamber
  //   dedx - array of dedx slices organized layer wise
  //   p - array of momentum measurements organized layer wise
  // 
  // Return parameters
  //   prob - probabilities allocated by TRD for particle specis
  //   kNorm - switch to normalize probabilities to 1. By default true. If false return not normalized prob.
  // 
  // Return value
  //   number of tracklets used for PID, 0 if no PID
    //
    AliDebug(3,Form(" Response for PID method: %d",PIDmethod));


    if(!fkPIDResponseObject){
	AliDebug(3,"Missing reference data. PID calculation not possible.");
	return 0;
    }

    for(Int_t is(AliPID::kSPECIES); is--;) prob[is]=.2;
    Double_t prLayer[AliPID::kSPECIES];
    Double_t dE[10], s(0.);
    Int_t ntrackletsPID=0;
    for(Int_t il(kNlayer); il--;){
	memset(prLayer, 0, AliPID::kSPECIES*sizeof(Double_t));
	if(!CookdEdx(n, &dedx[il*n], &dE[0],PIDmethod)) continue;
        s=0.;
        Bool_t filled=kTRUE;
	for(Int_t is(AliPID::kSPECIES); is--;){
	    //if((PIDmethod==kLQ2D)&&(!(is==0||is==2)))continue;
	    if((dE[0] > 0.) && (p[il] > 0.)) prLayer[is] = GetProbabilitySingleLayer(is, p[il], &dE[0],PIDmethod);
	    AliDebug(3, Form("Probability for Species %d in Layer %d: %e", is, il, prLayer[is]));
	    if(prLayer[is]<1.e-30){
		AliDebug(2, Form("Null for species %d species prob layer[%d].",is,il));
		filled=kFALSE;
		break;
	    }
	    s+=prLayer[is];
	}
	if(!filled){
	    continue;
	}
	if(s<1.e-30){
	    AliDebug(2, Form("Null all species prob layer[%d].", il));
	    continue;
	}
	for(Int_t is(AliPID::kSPECIES); is--;){
	    if(kNorm) prLayer[is] /= s;
	    prob[is] *= prLayer[is];
	}
	ntrackletsPID++;
    }
    if(!kNorm) return ntrackletsPID;

    s=0.;
    for(Int_t is(AliPID::kSPECIES); is--;) s+=prob[is];
    if(s<1.e-30){
	AliDebug(2, "Null total prob.");
	return 0;
    }
    for(Int_t is(AliPID::kSPECIES); is--;) prob[is]/=s;
    return ntrackletsPID;
}

//____________________________________________________________
Double_t AliTRDPIDResponse::GetProbabilitySingleLayer(Int_t species, Double_t plocal, Double_t *dEdx,ETRDPIDMethod PIDmethod) const {
  //
  // Get the non-normalized probability for a certain particle species as coming
  // from the reference histogram
  // Interpolation between momentum bins
  //
  AliDebug(1, Form("Make Probability for Species %d with Momentum %f", species, plocal));

  Double_t probLayer = 0.;

  Float_t pLower, pUpper;
	
  AliTRDNDFast *refUpper = dynamic_cast<AliTRDNDFast *>(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,PIDmethod)),
      *refLower = dynamic_cast<AliTRDNDFast *>(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,PIDmethod));

  // Do Interpolation exept for underflow and overflow
  if(refLower && refUpper){
      Double_t probLower = refLower->Eval(dEdx);
      Double_t probUpper = refUpper->Eval(dEdx);

      probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
  } else if(refLower){
     // underflow
      probLayer = refLower->Eval(dEdx);
  } else if(refUpper){
      // overflow
      probLayer = refUpper->Eval(dEdx);
  } else {
      AliError("No references available");
  }
  AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));

  return probLayer;

/* old implementation

switch(PIDmethod){
case kNN: // NN
      break;
  case kLQ2D: // 2D LQ
      {
	  if(species==0||species==2){ // references only for electrons and pions
	      Double_t error = 0.;
	      Double_t point[kNslicesLQ2D];
	      for(Int_t idim=0;idim<kNslicesLQ2D;idim++){point[idim]=dEdx[idim];}

	      AliTRDTKDInterpolator *refUpper = dynamic_cast<AliTRDTKDInterpolator *>(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ2D)),
	      *refLower = dynamic_cast<AliTRDTKDInterpolator *>(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ2D));
	      // Do Interpolation exept for underflow and overflow
	      if(refLower && refUpper){
                  Double_t probLower=0,probUpper=0;
		  refLower->Eval(point,probLower,error);
                  refUpper->Eval(point,probUpper,error);
		  probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	      } else if(refLower){
		  // underflow
		  refLower->Eval(point,probLayer,error);
		  } else if(refUpper){
		  // overflow
		  refUpper->Eval(point,probLayer,error);
	      } else {
		  AliError("No references available");
	      }
	      AliDebug(2,Form("Eval 2D Q0 %f Q1 %f P %e Err %e",point[0],point[1],probLayer,error));
	  }
      }
      break;
  case kLQ1D: // 1D LQ
      {
	  TH1 *refUpper = dynamic_cast<TH1 *>(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ1D)),
	      *refLower = dynamic_cast<TH1 *>(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ1D));
	  // Do Interpolation exept for underflow and overflow
	  if(refLower && refUpper){
	      Double_t probLower = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	      Double_t probUpper = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));

	      probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	  } else if(refLower){
	      // underflow
	      probLayer = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	  } else if(refUpper){
	      // overflow
	      probLayer = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));
	  } else {
	      AliError("No references available");
	  }
	  AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));
      }
      break;
  default:
      break;
      }
      return probLayer;
      */

}

//____________________________________________________________
void AliTRDPIDResponse::SetOwner(){
  //
  // Make Deep Copy of the Reference Histograms
  //
    if(!fkPIDResponseObject || IsOwner()) return;
    const AliTRDPIDResponseObject *tmp = fkPIDResponseObject;
    fkPIDResponseObject = dynamic_cast<const AliTRDPIDResponseObject *>(tmp->Clone());
    SetBit(kIsOwner, kTRUE);
}

//____________________________________________________________
Bool_t AliTRDPIDResponse::CookdEdx(Int_t nSlice, const Double_t * const in, Double_t *out,ETRDPIDMethod PIDmethod) const
{
    //
    // Recalculate dE/dx
    //
  switch(PIDmethod){
  case kNN: // NN 
      break;
  case kLQ2D: // 2D LQ
      out[0]=0;
      out[1]=0;
      for(Int_t islice = 0; islice < nSlice; islice++){
	  if(in[islice]<=0){out[0]=0;out[1]=0;return kFALSE;}  // Require that all slices are filled
	  if(islice<fkPIDResponseObject->GetNSlicesQ0())out[0]+= in[islice];
	  else out[1]+= in[islice];
      }
      // normalize signal to number of slices
      out[0]*=1./Double_t(fkPIDResponseObject->GetNSlicesQ0());
      out[1]*=1./Double_t(nSlice-fkPIDResponseObject->GetNSlicesQ0());
      if(out[0] < 1e-6) return kFALSE;
      AliDebug(3,Form("CookdEdx Q0 %f Q1 %f",out[0],out[1]));
      break;
  case kLQ1D: // 1D LQ
      out[0]= 0.;
      for(Int_t islice = 0; islice < nSlice; islice++)
	  if(in[islice] > 0) out[0] += in[islice] * fGainNormalisationFactor;   // Protect against negative values for slices having no dE/dx information
      out[0]*=1./Double_t(nSlice);
      if(out[0] < 1e-6) return kFALSE;
      AliDebug(3,Form("CookdEdx dEdx %f",out[0]));
      break;

  default:
      return kFALSE;
  }
  return kTRUE;
}

//____________________________________________________________
Bool_t AliTRDPIDResponse::IdentifiedAsElectron(Int_t nTracklets, const Double_t *like, Double_t p, Double_t level,Double_t centrality,ETRDPIDMethod PIDmethod) const {
    //
    // Check whether particle is identified as electron assuming a certain electron efficiency level
    // Only electron and pion hypothesis is taken into account
    //
    // Inputs:
    //         Number of tracklets
    //         Likelihood values
    //         Momentum
    //         Electron efficiency level
    //
    // If the function fails when the params are not accessible, the function returns true
    //
  if(!fkPIDResponseObject){
    AliDebug(3,"No PID Param object available");
    return kTRUE;
  } 
  Double_t probEle = like[AliPID::kElectron]/(like[AliPID::kElectron] + like[AliPID::kPion]);
  Double_t params[4];
  if(!fkPIDResponseObject->GetThresholdParameters(nTracklets, level, params,centrality,PIDmethod)){
    AliError("No Params found for the given configuration");
    return kTRUE;
  }
  Double_t threshold = 1. - params[0] - params[1] * p - params[2] * TMath::Exp(-params[3] * p);
  if(probEle > TMath::Max(TMath::Min(threshold, 0.99), 0.2)) return kTRUE; // truncate the threshold upperwards to 0.999 and lowerwards to 0.2 and exclude unphysical values
  return kFALSE;
}

//____________________________________________________________
Bool_t AliTRDPIDResponse::SetPIDResponseObject(const AliTRDPIDResponseObject * obj){

    fkPIDResponseObject = obj;
    if((AliLog::GetDebugLevel("",IsA()->GetName()))>0)fkPIDResponseObject->Print("");
    return kTRUE;
}


//____________________________________________________________    
Bool_t AliTRDPIDResponse::SetdEdxParams(const AliTRDdEdxParams * par)
{
  fkTRDdEdxParams = par;
  return kTRUE;
}
Commit	Line	Data
ffb1ee30	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15	//
	16	// PID Response class for the TRD detector
	17	// Based on 1D Likelihood approach
	18	// Calculation of probabilities using Bayesian approach
	19	// Attention: This method is only used to separate electrons from pions
	20	//
	21	// Authors:
	22	// Markus Fasel <M.Fasel@gsi.de>
	23	// Anton Andronic <A.Andronic@gsi.de>
	24	//
ffb1ee30	25	#include <TAxis.h>
ea235c90	26	#include <TClass.h>
ea235c90	27	#include <TDirectory.h>
ffb1ee30	28	#include <TFile.h>
ffb1ee30	29	#include <TH1.h>
ce5d6908	30	#include <TKey.h>
ea235c90	31	#include <TMath.h>
ffb1ee30	32	#include <TObjArray.h>
ce5d6908	33	#include <TROOT.h>
ea235c90	34	#include <TString.h>
ffb1ee30	35	#include <TSystem.h>
	36
	37	#include "AliLog.h"
5cd0300d	38
5cd0300d	39	#include "AliVTrack.h"
ffb1ee30	40
db0e2c5f	41	#include "AliTRDPIDResponseObject.h"
ffb1ee30	42	#include "AliTRDPIDResponse.h"
239fe91c	43	//#include "AliTRDTKDInterpolator.h"
239fe91c	44	#include "AliTRDNDFast.h"
9c499471	45	#include "AliTRDdEdxParams.h"
ffb1ee30	46
	47	ClassImp(AliTRDPIDResponse)
	48
ffb1ee30	49	//____________________________________________________________
e0de37e9	50	AliTRDPIDResponse::AliTRDPIDResponse():
e0de37e9	51	TObject()
db0e2c5f	52	,fkPIDResponseObject(NULL)
9c499471	53	,fkTRDdEdxParams(NULL)
e0de37e9	54	,fGainNormalisationFactor(1.)
ffb1ee30	55	{
e0de37e9	56	//
	57	// Default constructor
	58	//
ffb1ee30	59	}
	60
	61	//____________________________________________________________
	62	AliTRDPIDResponse::AliTRDPIDResponse(const AliTRDPIDResponse &ref):
e0de37e9	63	TObject(ref)
db0e2c5f	64	,fkPIDResponseObject(NULL)
9c499471	65	,fkTRDdEdxParams(NULL)
e0de37e9	66	,fGainNormalisationFactor(ref.fGainNormalisationFactor)
ffb1ee30	67	{
e0de37e9	68	//
e0de37e9	69	// Copy constructor
e0de37e9	70	//
ffb1ee30	71	}
	72
	73	//____________________________________________________________
	74	AliTRDPIDResponse &AliTRDPIDResponse::operator=(const AliTRDPIDResponse &ref){
e0de37e9	75	//
e0de37e9	76	// Assignment operator
e0de37e9	77	//
	78	if(this == &ref) return *this;
	79
	80	// Make copy
	81	TObject::operator=(ref);
51a0ce25	82	fGainNormalisationFactor = ref.fGainNormalisationFactor;
db0e2c5f	83	fkPIDResponseObject = ref.fkPIDResponseObject;
9c499471	84	fkTRDdEdxParams = ref.fkTRDdEdxParams;
9c499471	85
e0de37e9	86	return *this;
ffb1ee30	87	}
	88
	89	//____________________________________________________________
	90	AliTRDPIDResponse::~AliTRDPIDResponse(){
e0de37e9	91	//
	92	// Destructor
	93	//
9c499471	94	if(IsOwner()) {
	95	delete fkPIDResponseObject;
	96	delete fkTRDdEdxParams;
	97	}
ffb1ee30	98	}
	99
	100	//____________________________________________________________
db0e2c5f	101	Bool_t AliTRDPIDResponse::Load(const Char_t * filename){
e0de37e9	102	//
	103	// Load References into the toolkit
	104	//
	105	AliDebug(1, "Loading reference histos from root file");
2ad33025	106	TDirectory *owd = gDirectory;// store old working directory
e0de37e9	107
	108	if(!filename)
	109	filename = Form("%s/STEER/LQ1dRef_v1.root",gSystem->ExpandPathName("$ALICE_ROOT"));
	110	TFile *in = TFile::Open(filename);
	111	if(!in){
	112	AliError("Ref file not available.");
	113	return kFALSE;
	114	}
	115
	116	gROOT->cd();
db0e2c5f	117	fkPIDResponseObject = dynamic_cast<const AliTRDPIDResponseObject *>(in->Get("TRDPIDResponse")->Clone());
51a0ce25	118	in->Close(); delete in;
e0de37e9	119	owd->cd();
e0de37e9	120	SetBit(kIsOwner, kTRUE);
db0e2c5f	121	AliDebug(2, Form("Successfully loaded References for %d Momentum bins", fkPIDResponseObject->GetNumberOfMomentumBins()));
e0de37e9	122	return kTRUE;
ffb1ee30	123	}
ffb1ee30	124
5cd0300d	125
	126
	127	//____________________________________________________________
	128	Double_t AliTRDPIDResponse::GetNumberOfSigmas(const AliVTrack *track, AliPID::EParticleType type) const
	129	{
	130	//
	131	//calculate the TRD nSigma
	132	//
	133
	134	const Double_t badval = -9999;
	135	Double_t info[5]; for(int i=0; i<5; i++){info[i]=badval;}
	136
	137	const Double_t delta = GetSignalDelta(track, type, kFALSE, info);
	138
	139	const Double_t mean = info[0];
	140	const Double_t res = info[1];
	141	if(res<0){
	142	return badval;
	143	}
	144
	145	const Double_t sigma = mean*res;
bebe75fc	146	const Double_t eps = 1e-12;
bebe75fc	147	return delta/(sigma + eps);
5cd0300d	148	}
	149
	150	//____________________________________________________________
	151	Double_t AliTRDPIDResponse::GetSignalDelta( const AliVTrack* track, AliPID::EParticleType type, Bool_t ratio/=kFALSE/, Double_t info/=0x0*/) const
	152	{
	153	//
	154	//calculate the TRD signal difference w.r.t. the expected
	155	//output other information in info[]
	156	//
	157
9c499471	158	const Double_t badval = -9999;
5cd0300d	159
	160	//cut on number of chambers
	161	const Double_t cutch = 6;
	162
	163	//cut on mean number of clusters per chamber
	164	const Double_t cutclsperch = 18;
5cd0300d	165
	166	const Double_t nch = track->GetTRDNchamberdEdx();
	167	if(nch < cutch){
	168	return badval;
	169	}
	170
	171	const Double_t ncls = track->GetTRDNclusterdEdx();
	172	if( ncls/nch < cutclsperch){
	173	return badval;
	174	}
	175
	176	Double_t pTRD = -999;
	177	for(Int_t ich=0; ich<6; ich++){
	178	pTRD = track->GetTRDmomentum(ich);
	179	if(pTRD>0)
	180	break;
	181	}
	182	if(pTRD<0){
	183	return badval;
	184	}
	185
9c499471	186	if(!fkTRDdEdxParams){
2ddf4abb	187	AliError("fkTRDdEdxParams null");
9c499471	188	return -99999;
	189	}
	190
2ddf4abb	191	const Float_t *meanpar = (fkTRDdEdxParams->GetMeanParameter(type)).GetMatrixArray();
2ddf4abb	192	const Float_t *respar = (fkTRDdEdxParams->GetSigmaParameter(type)).GetMatrixArray();
9c499471	193
	194	//============================================================================================<<<<<<<<<<<<<
	195
5cd0300d	196	const Double_t bg = pTRD/AliPID::ParticleMass(type);
9c499471	197	const Double_t expsig = MeandEdxTR(&bg, meanpar);
5cd0300d	198
	199	if(info){
	200	info[0]= expsig;
9c499471	201	info[1]= ResolutiondEdxTR(&ncls, respar);
5cd0300d	202	}
5cd0300d	203
bebe75fc	204	const Double_t eps = 1e-10;
bebe75fc	205
5cd0300d	206	if(ratio){
bebe75fc	207	return track->GetTRDsignal()/(expsig + eps);
5cd0300d	208	}
	209	else{
	210	return track->GetTRDsignal() - expsig;
	211	}
	212	}
	213
	214
2ddf4abb	215	Double_t AliTRDPIDResponse::ResolutiondEdxTR(const Double_t * xx, const Float_t * par)
5cd0300d	216	{
	217	//
	218	//resolution
	219	//npar=3
	220	//
	221
	222	const Double_t ncls = xx[0];
	223
	224	return par[0]+par[1]*TMath::Power(ncls, par[2]);
	225	}
	226
2ddf4abb	227	Double_t AliTRDPIDResponse::MeandEdxTR(const Double_t * xx, const Float_t * pin)
5cd0300d	228	{
	229	//
	230	//ALEPH+LOGISTIC parametrization for dEdx+TR, in unit of MIP
	231	//npar = 8 = 3+5
	232	//
	233
2ddf4abb	234	Float_t ptr[4]={0};
5cd0300d	235	for(int ii=0; ii<3; ii++){
	236	ptr[ii+1]=pin[ii];
	237	}
	238	return MeanTR(xx,ptr) + MeandEdx(xx,&(pin[3]));
	239	}
	240
2ddf4abb	241	Double_t AliTRDPIDResponse::MeanTR(const Double_t * xx, const Float_t * par)
5cd0300d	242	{
	243	//
	244	//LOGISTIC parametrization for TR, in unit of MIP
	245	//npar = 4
	246	//
	247
	248	const Double_t bg = xx[0];
	249	const Double_t gamma = sqrt(1+bg*bg);
	250
	251	const Double_t p0 = TMath::Abs(par[1]);
	252	const Double_t p1 = TMath::Abs(par[2]);
	253	const Double_t p2 = TMath::Abs(par[3]);
	254
	255	const Double_t zz = TMath::Log(gamma);
	256	const Double_t tryield = p0/( 1 + TMath::Exp(-p1*(zz-p2)) );
	257
	258	return par[0]+tryield;
	259	}
	260
2ddf4abb	261	Double_t AliTRDPIDResponse::MeandEdx(const Double_t * xx, const Float_t * par)
5cd0300d	262	{
	263	//
	264	//ALEPH parametrization for dEdx
	265	//npar = 5
	266	//
	267
	268	const Double_t bg = xx[0];
	269	const Double_t beta = bg/TMath::Sqrt(1.+ bg*bg);
	270
	271	const Double_t p0 = TMath::Abs(par[0]);
	272	const Double_t p1 = TMath::Abs(par[1]);
	273
	274	const Double_t p2 = TMath::Abs(par[2]);
	275
	276	const Double_t p3 = TMath::Abs(par[3]);
	277	const Double_t p4 = TMath::Abs(par[4]);
	278
	279	const Double_t aa = TMath::Power(beta, p3);
	280
	281	const Double_t bb = TMath::Log( p2 + TMath::Power(1./bg, p4) );
	282
	283	return (p1-aa-bb)*p0/aa;
	284
	285	}
	286
	287
ffb1ee30	288	//____________________________________________________________
239fe91c	289	Int_t AliTRDPIDResponse::GetResponse(Int_t n, const Double_t * const dedx, const Float_t * const p, Double_t prob[AliPID::kSPECIES],ETRDPIDMethod PIDmethod,Bool_t kNorm) const
ffb1ee30	290	{
e0de37e9	291	//
	292	// Calculate TRD likelihood values for the track based on dedx and
	293	// momentum values. The likelihoods are calculated by query the
	294	// reference data depending on the PID method selected
	295	//
	296	// Input parameter :
	297	// n - number of dedx slices/chamber
	298	// dedx - array of dedx slices organized layer wise
	299	// p - array of momentum measurements organized layer wise
	300	//
	301	// Return parameters
	302	// prob - probabilities allocated by TRD for particle specis
	303	// kNorm - switch to normalize probabilities to 1. By default true. If false return not normalized prob.
	304	//
	305	// Return value
239fe91c	306	// number of tracklets used for PID, 0 if no PID
bd58d4b9	307	//
	308	AliDebug(3,Form(" Response for PID method: %d",PIDmethod));
	309
ffb1ee30	310
db0e2c5f	311	if(!fkPIDResponseObject){
31746593	312	AliDebug(3,"Missing reference data. PID calculation not possible.");
239fe91c	313	return 0;
db0e2c5f	314	}
ffb1ee30	315
db0e2c5f	316	for(Int_t is(AliPID::kSPECIES); is--;) prob[is]=.2;
	317	Double_t prLayer[AliPID::kSPECIES];
	318	Double_t dE[10], s(0.);
239fe91c	319	Int_t ntrackletsPID=0;
db0e2c5f	320	for(Int_t il(kNlayer); il--;){
db0e2c5f	321	memset(prLayer, 0, AliPID::kSPECIES*sizeof(Double_t));
bd58d4b9	322	if(!CookdEdx(n, &dedx[il*n], &dE[0],PIDmethod)) continue;
239fe91c	323	s=0.;
db0e2c5f	324	Bool_t filled=kTRUE;
db0e2c5f	325	for(Int_t is(AliPID::kSPECIES); is--;){
239fe91c	326	//if((PIDmethod==kLQ2D)&&(!(is==0\|\|is==2)))continue;
bd58d4b9	327	if((dE[0] > 0.) && (p[il] > 0.)) prLayer[is] = GetProbabilitySingleLayer(is, p[il], &dE[0],PIDmethod);
f2762b1c	328	AliDebug(3, Form("Probability for Species %d in Layer %d: %e", is, il, prLayer[is]));
db0e2c5f	329	if(prLayer[is]<1.e-30){
	330	AliDebug(2, Form("Null for species %d species prob layer[%d].",is,il));
	331	filled=kFALSE;
	332	break;
	333	}
	334	s+=prLayer[is];
	335	}
	336	if(!filled){
	337	continue;
	338	}
	339	if(s<1.e-30){
	340	AliDebug(2, Form("Null all species prob layer[%d].", il));
	341	continue;
	342	}
	343	for(Int_t is(AliPID::kSPECIES); is--;){
	344	if(kNorm) prLayer[is] /= s;
	345	prob[is] *= prLayer[is];
	346	}
239fe91c	347	ntrackletsPID++;
e0de37e9	348	}
239fe91c	349	if(!kNorm) return ntrackletsPID;
db0e2c5f	350
	351	s=0.;
	352	for(Int_t is(AliPID::kSPECIES); is--;) s+=prob[is];
e0de37e9	353	if(s<1.e-30){
db0e2c5f	354	AliDebug(2, "Null total prob.");
239fe91c	355	return 0;
e0de37e9	356	}
db0e2c5f	357	for(Int_t is(AliPID::kSPECIES); is--;) prob[is]/=s;
239fe91c	358	return ntrackletsPID;
ffb1ee30	359	}
ffb1ee30	360
ffb1ee30	361	//____________________________________________________________
bd58d4b9	362	Double_t AliTRDPIDResponse::GetProbabilitySingleLayer(Int_t species, Double_t plocal, Double_t *dEdx,ETRDPIDMethod PIDmethod) const {
e0de37e9	363	//
	364	// Get the non-normalized probability for a certain particle species as coming
	365	// from the reference histogram
	366	// Interpolation between momentum bins
	367	//
	368	AliDebug(1, Form("Make Probability for Species %d with Momentum %f", species, plocal));
db0e2c5f	369
51a0ce25	370	Double_t probLayer = 0.;
239fe91c	371
db0e2c5f	372	Float_t pLower, pUpper;
db0e2c5f	373
239fe91c	374	AliTRDNDFast refUpper = dynamic_cast<AliTRDNDFast >(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,PIDmethod)),
	375	refLower = dynamic_cast<AliTRDNDFast >(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,PIDmethod));
	376
	377	// Do Interpolation exept for underflow and overflow
	378	if(refLower && refUpper){
	379	Double_t probLower = refLower->Eval(dEdx);
	380	Double_t probUpper = refUpper->Eval(dEdx);
	381
	382	probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	383	} else if(refLower){
	384	// underflow
	385	probLayer = refLower->Eval(dEdx);
	386	} else if(refUpper){
	387	// overflow
	388	probLayer = refUpper->Eval(dEdx);
	389	} else {
	390	AliError("No references available");
	391	}
	392	AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));
	393
	394	return probLayer;
	395
	396	/* old implementation
	397
	398	switch(PIDmethod){
	399	case kNN: // NN
db0e2c5f	400	break;
	401	case kLQ2D: // 2D LQ
	402	{
f2762b1c	403	if(species==0\|\|species==2){ // references only for electrons and pions
2285168d	404	Double_t error = 0.;
f2762b1c	405	Double_t point[kNslicesLQ2D];
f2762b1c	406	for(Int_t idim=0;idim<kNslicesLQ2D;idim++){point[idim]=dEdx[idim];}
db0e2c5f	407
239fe91c	408	AliTRDTKDInterpolator refUpper = dynamic_cast<AliTRDTKDInterpolator >(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ2D)),
	409	refLower = dynamic_cast<AliTRDTKDInterpolator >(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ2D));
	410	// Do Interpolation exept for underflow and overflow
	411	if(refLower && refUpper){
	412	Double_t probLower=0,probUpper=0;
	413	refLower->Eval(point,probLower,error);
	414	refUpper->Eval(point,probUpper,error);
	415	probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	416	} else if(refLower){
	417	// underflow
f2762b1c	418	refLower->Eval(point,probLayer,error);
239fe91c	419	} else if(refUpper){
	420	// overflow
	421	refUpper->Eval(point,probLayer,error);
	422	} else {
f2762b1c	423	AliError("No references available");
	424	}
	425	AliDebug(2,Form("Eval 2D Q0 %f Q1 %f P %e Err %e",point[0],point[1],probLayer,error));
db0e2c5f	426	}
	427	}
	428	break;
	429	case kLQ1D: // 1D LQ
	430	{
	431	TH1 refUpper = dynamic_cast<TH1 >(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ1D)),
	432	refLower = dynamic_cast<TH1 >(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ1D));
	433	// Do Interpolation exept for underflow and overflow
	434	if(refLower && refUpper){
	435	Double_t probLower = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	436	Double_t probUpper = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));
	437
	438	probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	439	} else if(refLower){
	440	// underflow
	441	probLayer = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	442	} else if(refUpper){
	443	// overflow
	444	probLayer = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));
	445	} else {
	446	AliError("No references available");
	447	}
f2762b1c	448	AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));
db0e2c5f	449	}
	450	break;
	451	default:
	452	break;
239fe91c	453	}
	454	return probLayer;
	455	*/
	456
ffb1ee30	457	}
	458
	459	//____________________________________________________________
	460	void AliTRDPIDResponse::SetOwner(){
e0de37e9	461	//
	462	// Make Deep Copy of the Reference Histograms
	463	//
db0e2c5f	464	if(!fkPIDResponseObject \|\| IsOwner()) return;
	465	const AliTRDPIDResponseObject *tmp = fkPIDResponseObject;
	466	fkPIDResponseObject = dynamic_cast<const AliTRDPIDResponseObject *>(tmp->Clone());
	467	SetBit(kIsOwner, kTRUE);
ffb1ee30	468	}
	469
	470	//____________________________________________________________
bd58d4b9	471	Bool_t AliTRDPIDResponse::CookdEdx(Int_t nSlice, const Double_t * const in, Double_t *out,ETRDPIDMethod PIDmethod) const
ffb1ee30	472	{
f2762b1c	473	//
	474	// Recalculate dE/dx
	475	//
bd58d4b9	476	switch(PIDmethod){
e0de37e9	477	case kNN: // NN
db0e2c5f	478	break;
	479	case kLQ2D: // 2D LQ
	480	out[0]=0;
	481	out[1]=0;
	482	for(Int_t islice = 0; islice < nSlice; islice++){
239fe91c	483	if(in[islice]<=0){out[0]=0;out[1]=0;return kFALSE;} // Require that all slices are filled
db0e2c5f	484	if(islice<fkPIDResponseObject->GetNSlicesQ0())out[0]+= in[islice];
	485	else out[1]+= in[islice];
	486	}
239fe91c	487	// normalize signal to number of slices
	488	out[0]*=1./Double_t(fkPIDResponseObject->GetNSlicesQ0());
	489	out[1]*=1./Double_t(nSlice-fkPIDResponseObject->GetNSlicesQ0());
f2762b1c	490	if(out[0] < 1e-6) return kFALSE;
f2762b1c	491	AliDebug(3,Form("CookdEdx Q0 %f Q1 %f",out[0],out[1]));
db0e2c5f	492	break;
	493	case kLQ1D: // 1D LQ
	494	out[0]= 0.;
	495	for(Int_t islice = 0; islice < nSlice; islice++)
	496	if(in[islice] > 0) out[0] += in[islice] * fGainNormalisationFactor; // Protect against negative values for slices having no dE/dx information
239fe91c	497	out[0]*=1./Double_t(nSlice);
db0e2c5f	498	if(out[0] < 1e-6) return kFALSE;
f2762b1c	499	AliDebug(3,Form("CookdEdx dEdx %f",out[0]));
db0e2c5f	500	break;
db0e2c5f	501
e0de37e9	502	default:
db0e2c5f	503	return kFALSE;
e0de37e9	504	}
e0de37e9	505	return kTRUE;
ffb1ee30	506	}
ffb1ee30	507
ea235c90	508	//____________________________________________________________
bd58d4b9	509	Bool_t AliTRDPIDResponse::IdentifiedAsElectron(Int_t nTracklets, const Double_t *like, Double_t p, Double_t level,Double_t centrality,ETRDPIDMethod PIDmethod) const {
db0e2c5f	510	//
	511	// Check whether particle is identified as electron assuming a certain electron efficiency level
	512	// Only electron and pion hypothesis is taken into account
	513	//
	514	// Inputs:
	515	// Number of tracklets
	516	// Likelihood values
	517	// Momentum
	518	// Electron efficiency level
	519	//
	520	// If the function fails when the params are not accessible, the function returns true
	521	//
	522	if(!fkPIDResponseObject){
31746593	523	AliDebug(3,"No PID Param object available");
ea235c90	524	return kTRUE;
	525	}
	526	Double_t probEle = like[AliPID::kElectron]/(like[AliPID::kElectron] + like[AliPID::kPion]);
ce487a7f	527	Double_t params[4];
bd58d4b9	528	if(!fkPIDResponseObject->GetThresholdParameters(nTracklets, level, params,centrality,PIDmethod)){
ea235c90	529	AliError("No Params found for the given configuration");
	530	return kTRUE;
	531	}
ce487a7f	532	Double_t threshold = 1. - params[0] - params[1] * p - params[2] * TMath::Exp(-params[3] * p);
ea235c90	533	if(probEle > TMath::Max(TMath::Min(threshold, 0.99), 0.2)) return kTRUE; // truncate the threshold upperwards to 0.999 and lowerwards to 0.2 and exclude unphysical values
	534	return kFALSE;
	535	}
	536
f2762b1c	537	//____________________________________________________________
	538	Bool_t AliTRDPIDResponse::SetPIDResponseObject(const AliTRDPIDResponseObject * obj){
	539
	540	fkPIDResponseObject = obj;
	541	if((AliLog::GetDebugLevel("",IsA()->GetName()))>0)fkPIDResponseObject->Print("");
	542	return kTRUE;
	543	}
9c499471	544
	545
	546	//____________________________________________________________
	547	Bool_t AliTRDPIDResponse::SetdEdxParams(const AliTRDdEdxParams * par)
	548	{
	549	fkTRDdEdxParams = par;
	550	return kTRUE;
	551	}