[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;
  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 Double_t nch = track->GetTRDNchamberdEdx();
  const Double_t ncls = track->GetTRDNclusterdEdx();

  const TVectorF meanvec = fkTRDdEdxParams->GetMeanParameter(type, nch, ncls);
  if(meanvec.GetNrows()==0){
    return badval;
  }

  const TVectorF resvec  = fkTRDdEdxParams->GetSigmaParameter(type, nch, ncls);
  if(resvec.GetNrows()==0){
    return badval;
  }

  const Float_t *meanpar = meanvec.GetMatrixArray();
  const Float_t *respar  = resvec.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	Double_t pTRD = -999;
	160	for(Int_t ich=0; ich<6; ich++){
	161	pTRD = track->GetTRDmomentum(ich);
	162	if(pTRD>0)
	163	break;
	164	}
	165	if(pTRD<0){
	166	return badval;
	167	}
	168
9c499471	169	if(!fkTRDdEdxParams){
2ddf4abb	170	AliError("fkTRDdEdxParams null");
9c499471	171	return -99999;
	172	}
	173
a8da1749	174	const Double_t nch = track->GetTRDNchamberdEdx();
	175	const Double_t ncls = track->GetTRDNclusterdEdx();
	176
	177	const TVectorF meanvec = fkTRDdEdxParams->GetMeanParameter(type, nch, ncls);
	178	if(meanvec.GetNrows()==0){
	179	return badval;
	180	}
	181
	182	const TVectorF resvec = fkTRDdEdxParams->GetSigmaParameter(type, nch, ncls);
	183	if(resvec.GetNrows()==0){
	184	return badval;
	185	}
	186
	187	const Float_t *meanpar = meanvec.GetMatrixArray();
	188	const Float_t *respar = resvec.GetMatrixArray();
9c499471	189
	190	//============================================================================================<<<<<<<<<<<<<
	191
5cd0300d	192	const Double_t bg = pTRD/AliPID::ParticleMass(type);
9c499471	193	const Double_t expsig = MeandEdxTR(&bg, meanpar);
5cd0300d	194
	195	if(info){
	196	info[0]= expsig;
9c499471	197	info[1]= ResolutiondEdxTR(&ncls, respar);
5cd0300d	198	}
5cd0300d	199
bebe75fc	200	const Double_t eps = 1e-10;
bebe75fc	201
5cd0300d	202	if(ratio){
bebe75fc	203	return track->GetTRDsignal()/(expsig + eps);
5cd0300d	204	}
	205	else{
	206	return track->GetTRDsignal() - expsig;
	207	}
	208	}
	209
	210
2ddf4abb	211	Double_t AliTRDPIDResponse::ResolutiondEdxTR(const Double_t * xx, const Float_t * par)
5cd0300d	212	{
	213	//
	214	//resolution
	215	//npar=3
	216	//
	217
	218	const Double_t ncls = xx[0];
	219
	220	return par[0]+par[1]*TMath::Power(ncls, par[2]);
	221	}
	222
2ddf4abb	223	Double_t AliTRDPIDResponse::MeandEdxTR(const Double_t * xx, const Float_t * pin)
5cd0300d	224	{
	225	//
	226	//ALEPH+LOGISTIC parametrization for dEdx+TR, in unit of MIP
	227	//npar = 8 = 3+5
	228	//
	229
2ddf4abb	230	Float_t ptr[4]={0};
5cd0300d	231	for(int ii=0; ii<3; ii++){
	232	ptr[ii+1]=pin[ii];
	233	}
	234	return MeanTR(xx,ptr) + MeandEdx(xx,&(pin[3]));
	235	}
	236
2ddf4abb	237	Double_t AliTRDPIDResponse::MeanTR(const Double_t * xx, const Float_t * par)
5cd0300d	238	{
	239	//
	240	//LOGISTIC parametrization for TR, in unit of MIP
	241	//npar = 4
	242	//
	243
	244	const Double_t bg = xx[0];
	245	const Double_t gamma = sqrt(1+bg*bg);
	246
	247	const Double_t p0 = TMath::Abs(par[1]);
	248	const Double_t p1 = TMath::Abs(par[2]);
	249	const Double_t p2 = TMath::Abs(par[3]);
	250
	251	const Double_t zz = TMath::Log(gamma);
	252	const Double_t tryield = p0/( 1 + TMath::Exp(-p1*(zz-p2)) );
	253
	254	return par[0]+tryield;
	255	}
	256
2ddf4abb	257	Double_t AliTRDPIDResponse::MeandEdx(const Double_t * xx, const Float_t * par)
5cd0300d	258	{
	259	//
	260	//ALEPH parametrization for dEdx
	261	//npar = 5
	262	//
	263
	264	const Double_t bg = xx[0];
	265	const Double_t beta = bg/TMath::Sqrt(1.+ bg*bg);
	266
	267	const Double_t p0 = TMath::Abs(par[0]);
	268	const Double_t p1 = TMath::Abs(par[1]);
	269
	270	const Double_t p2 = TMath::Abs(par[2]);
	271
	272	const Double_t p3 = TMath::Abs(par[3]);
	273	const Double_t p4 = TMath::Abs(par[4]);
	274
	275	const Double_t aa = TMath::Power(beta, p3);
	276
	277	const Double_t bb = TMath::Log( p2 + TMath::Power(1./bg, p4) );
	278
	279	return (p1-aa-bb)*p0/aa;
	280
	281	}
	282
	283
ffb1ee30	284	//____________________________________________________________
239fe91c	285	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	286	{
e0de37e9	287	//
	288	// Calculate TRD likelihood values for the track based on dedx and
	289	// momentum values. The likelihoods are calculated by query the
	290	// reference data depending on the PID method selected
	291	//
	292	// Input parameter :
	293	// n - number of dedx slices/chamber
	294	// dedx - array of dedx slices organized layer wise
	295	// p - array of momentum measurements organized layer wise
	296	//
	297	// Return parameters
	298	// prob - probabilities allocated by TRD for particle specis
	299	// kNorm - switch to normalize probabilities to 1. By default true. If false return not normalized prob.
	300	//
	301	// Return value
239fe91c	302	// number of tracklets used for PID, 0 if no PID
bd58d4b9	303	//
	304	AliDebug(3,Form(" Response for PID method: %d",PIDmethod));
	305
ffb1ee30	306
db0e2c5f	307	if(!fkPIDResponseObject){
31746593	308	AliDebug(3,"Missing reference data. PID calculation not possible.");
239fe91c	309	return 0;
db0e2c5f	310	}
ffb1ee30	311
db0e2c5f	312	for(Int_t is(AliPID::kSPECIES); is--;) prob[is]=.2;
	313	Double_t prLayer[AliPID::kSPECIES];
	314	Double_t dE[10], s(0.);
239fe91c	315	Int_t ntrackletsPID=0;
db0e2c5f	316	for(Int_t il(kNlayer); il--;){
db0e2c5f	317	memset(prLayer, 0, AliPID::kSPECIES*sizeof(Double_t));
bd58d4b9	318	if(!CookdEdx(n, &dedx[il*n], &dE[0],PIDmethod)) continue;
239fe91c	319	s=0.;
db0e2c5f	320	Bool_t filled=kTRUE;
db0e2c5f	321	for(Int_t is(AliPID::kSPECIES); is--;){
239fe91c	322	//if((PIDmethod==kLQ2D)&&(!(is==0\|\|is==2)))continue;
bd58d4b9	323	if((dE[0] > 0.) && (p[il] > 0.)) prLayer[is] = GetProbabilitySingleLayer(is, p[il], &dE[0],PIDmethod);
f2762b1c	324	AliDebug(3, Form("Probability for Species %d in Layer %d: %e", is, il, prLayer[is]));
db0e2c5f	325	if(prLayer[is]<1.e-30){
	326	AliDebug(2, Form("Null for species %d species prob layer[%d].",is,il));
	327	filled=kFALSE;
	328	break;
	329	}
	330	s+=prLayer[is];
	331	}
	332	if(!filled){
	333	continue;
	334	}
	335	if(s<1.e-30){
	336	AliDebug(2, Form("Null all species prob layer[%d].", il));
	337	continue;
	338	}
	339	for(Int_t is(AliPID::kSPECIES); is--;){
	340	if(kNorm) prLayer[is] /= s;
	341	prob[is] *= prLayer[is];
	342	}
239fe91c	343	ntrackletsPID++;
e0de37e9	344	}
239fe91c	345	if(!kNorm) return ntrackletsPID;
db0e2c5f	346
	347	s=0.;
	348	for(Int_t is(AliPID::kSPECIES); is--;) s+=prob[is];
e0de37e9	349	if(s<1.e-30){
db0e2c5f	350	AliDebug(2, "Null total prob.");
239fe91c	351	return 0;
e0de37e9	352	}
db0e2c5f	353	for(Int_t is(AliPID::kSPECIES); is--;) prob[is]/=s;
239fe91c	354	return ntrackletsPID;
ffb1ee30	355	}
ffb1ee30	356
ffb1ee30	357	//____________________________________________________________
bd58d4b9	358	Double_t AliTRDPIDResponse::GetProbabilitySingleLayer(Int_t species, Double_t plocal, Double_t *dEdx,ETRDPIDMethod PIDmethod) const {
e0de37e9	359	//
	360	// Get the non-normalized probability for a certain particle species as coming
	361	// from the reference histogram
	362	// Interpolation between momentum bins
	363	//
	364	AliDebug(1, Form("Make Probability for Species %d with Momentum %f", species, plocal));
db0e2c5f	365
51a0ce25	366	Double_t probLayer = 0.;
239fe91c	367
db0e2c5f	368	Float_t pLower, pUpper;
db0e2c5f	369
239fe91c	370	AliTRDNDFast refUpper = dynamic_cast<AliTRDNDFast >(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,PIDmethod)),
	371	refLower = dynamic_cast<AliTRDNDFast >(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,PIDmethod));
	372
	373	// Do Interpolation exept for underflow and overflow
	374	if(refLower && refUpper){
	375	Double_t probLower = refLower->Eval(dEdx);
	376	Double_t probUpper = refUpper->Eval(dEdx);
	377
	378	probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	379	} else if(refLower){
	380	// underflow
	381	probLayer = refLower->Eval(dEdx);
	382	} else if(refUpper){
	383	// overflow
	384	probLayer = refUpper->Eval(dEdx);
	385	} else {
	386	AliError("No references available");
	387	}
	388	AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));
	389
	390	return probLayer;
	391
	392	/* old implementation
	393
	394	switch(PIDmethod){
	395	case kNN: // NN
db0e2c5f	396	break;
	397	case kLQ2D: // 2D LQ
	398	{
f2762b1c	399	if(species==0\|\|species==2){ // references only for electrons and pions
2285168d	400	Double_t error = 0.;
f2762b1c	401	Double_t point[kNslicesLQ2D];
f2762b1c	402	for(Int_t idim=0;idim<kNslicesLQ2D;idim++){point[idim]=dEdx[idim];}
db0e2c5f	403
239fe91c	404	AliTRDTKDInterpolator refUpper = dynamic_cast<AliTRDTKDInterpolator >(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ2D)),
	405	refLower = dynamic_cast<AliTRDTKDInterpolator >(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ2D));
	406	// Do Interpolation exept for underflow and overflow
	407	if(refLower && refUpper){
	408	Double_t probLower=0,probUpper=0;
	409	refLower->Eval(point,probLower,error);
	410	refUpper->Eval(point,probUpper,error);
	411	probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	412	} else if(refLower){
	413	// underflow
f2762b1c	414	refLower->Eval(point,probLayer,error);
239fe91c	415	} else if(refUpper){
	416	// overflow
	417	refUpper->Eval(point,probLayer,error);
	418	} else {
f2762b1c	419	AliError("No references available");
	420	}
	421	AliDebug(2,Form("Eval 2D Q0 %f Q1 %f P %e Err %e",point[0],point[1],probLayer,error));
db0e2c5f	422	}
	423	}
	424	break;
	425	case kLQ1D: // 1D LQ
	426	{
	427	TH1 refUpper = dynamic_cast<TH1 >(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ1D)),
	428	refLower = dynamic_cast<TH1 >(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ1D));
	429	// Do Interpolation exept for underflow and overflow
	430	if(refLower && refUpper){
	431	Double_t probLower = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	432	Double_t probUpper = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));
	433
	434	probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	435	} else if(refLower){
	436	// underflow
	437	probLayer = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	438	} else if(refUpper){
	439	// overflow
	440	probLayer = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));
	441	} else {
	442	AliError("No references available");
	443	}
f2762b1c	444	AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));
db0e2c5f	445	}
	446	break;
	447	default:
	448	break;
239fe91c	449	}
	450	return probLayer;
	451	*/
	452
ffb1ee30	453	}
	454
	455	//____________________________________________________________
	456	void AliTRDPIDResponse::SetOwner(){
e0de37e9	457	//
	458	// Make Deep Copy of the Reference Histograms
	459	//
db0e2c5f	460	if(!fkPIDResponseObject \|\| IsOwner()) return;
	461	const AliTRDPIDResponseObject *tmp = fkPIDResponseObject;
	462	fkPIDResponseObject = dynamic_cast<const AliTRDPIDResponseObject *>(tmp->Clone());
	463	SetBit(kIsOwner, kTRUE);
ffb1ee30	464	}
	465
	466	//____________________________________________________________
bd58d4b9	467	Bool_t AliTRDPIDResponse::CookdEdx(Int_t nSlice, const Double_t * const in, Double_t *out,ETRDPIDMethod PIDmethod) const
ffb1ee30	468	{
f2762b1c	469	//
	470	// Recalculate dE/dx
	471	//
bd58d4b9	472	switch(PIDmethod){
e0de37e9	473	case kNN: // NN
db0e2c5f	474	break;
	475	case kLQ2D: // 2D LQ
	476	out[0]=0;
	477	out[1]=0;
	478	for(Int_t islice = 0; islice < nSlice; islice++){
239fe91c	479	if(in[islice]<=0){out[0]=0;out[1]=0;return kFALSE;} // Require that all slices are filled
db0e2c5f	480	if(islice<fkPIDResponseObject->GetNSlicesQ0())out[0]+= in[islice];
	481	else out[1]+= in[islice];
	482	}
239fe91c	483	// normalize signal to number of slices
	484	out[0]*=1./Double_t(fkPIDResponseObject->GetNSlicesQ0());
	485	out[1]*=1./Double_t(nSlice-fkPIDResponseObject->GetNSlicesQ0());
f2762b1c	486	if(out[0] < 1e-6) return kFALSE;
f2762b1c	487	AliDebug(3,Form("CookdEdx Q0 %f Q1 %f",out[0],out[1]));
db0e2c5f	488	break;
	489	case kLQ1D: // 1D LQ
	490	out[0]= 0.;
	491	for(Int_t islice = 0; islice < nSlice; islice++)
	492	if(in[islice] > 0) out[0] += in[islice] * fGainNormalisationFactor; // Protect against negative values for slices having no dE/dx information
239fe91c	493	out[0]*=1./Double_t(nSlice);
db0e2c5f	494	if(out[0] < 1e-6) return kFALSE;
f2762b1c	495	AliDebug(3,Form("CookdEdx dEdx %f",out[0]));
db0e2c5f	496	break;
db0e2c5f	497
e0de37e9	498	default:
db0e2c5f	499	return kFALSE;
e0de37e9	500	}
e0de37e9	501	return kTRUE;
ffb1ee30	502	}
ffb1ee30	503
ea235c90	504	//____________________________________________________________
bd58d4b9	505	Bool_t AliTRDPIDResponse::IdentifiedAsElectron(Int_t nTracklets, const Double_t *like, Double_t p, Double_t level,Double_t centrality,ETRDPIDMethod PIDmethod) const {
db0e2c5f	506	//
	507	// Check whether particle is identified as electron assuming a certain electron efficiency level
	508	// Only electron and pion hypothesis is taken into account
	509	//
	510	// Inputs:
	511	// Number of tracklets
	512	// Likelihood values
	513	// Momentum
	514	// Electron efficiency level
	515	//
	516	// If the function fails when the params are not accessible, the function returns true
	517	//
	518	if(!fkPIDResponseObject){
31746593	519	AliDebug(3,"No PID Param object available");
ea235c90	520	return kTRUE;
	521	}
	522	Double_t probEle = like[AliPID::kElectron]/(like[AliPID::kElectron] + like[AliPID::kPion]);
ce487a7f	523	Double_t params[4];
bd58d4b9	524	if(!fkPIDResponseObject->GetThresholdParameters(nTracklets, level, params,centrality,PIDmethod)){
ea235c90	525	AliError("No Params found for the given configuration");
	526	return kTRUE;
	527	}
ce487a7f	528	Double_t threshold = 1. - params[0] - params[1] * p - params[2] * TMath::Exp(-params[3] * p);
ea235c90	529	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
	530	return kFALSE;
	531	}
	532
f2762b1c	533	//____________________________________________________________
	534	Bool_t AliTRDPIDResponse::SetPIDResponseObject(const AliTRDPIDResponseObject * obj){
	535
	536	fkPIDResponseObject = obj;
	537	if((AliLog::GetDebugLevel("",IsA()->GetName()))>0)fkPIDResponseObject->Print("");
	538	return kTRUE;
	539	}
9c499471	540
	541
	542	//____________________________________________________________
	543	Bool_t AliTRDPIDResponse::SetdEdxParams(const AliTRDdEdxParams * par)
	544	{
	545	fkTRDdEdxParams = par;
	546	return kTRUE;
	547	}