[u/mrichter/AliRoot.git] / STEER / AliAODpidUtil.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.                  *
 **************************************************************************/

/* $Id: AliAODpidUtil.cxx 38329 2010-01-17 19:17:24Z hristov $ */

//-----------------------------------------------------------------
//           Implementation of the combined PID class
//           For the AOD Class
//           containing information on the particle identification
//      Origin: Rosa Romita, GSI, r.romita@gsi.de
//-----------------------------------------------------------------

#include "AliLog.h"
#include "AliPID.h"
#include "AliAODpidUtil.h"
#include "AliAODEvent.h"
#include "AliAODTrack.h"
#include "AliAODPid.h"
#include "AliTRDPIDResponse.h"
#include "AliESDtrack.h"

ClassImp(AliAODpidUtil)

  Int_t AliAODpidUtil::MakePID(AliAODTrack *track,Double_t *p) const {
  //
  //  Calculate probabilities for all detectors, except if TPConly==kTRUE
  //  and combine PID
  //  
  //   Option TPConly==kTRUE is used during reconstruction, 
  //  because ITS tracking uses TPC pid
  //  HMPID and TRD pid are done in detector reconstructors
  //

  /*
    Float_t TimeZeroTOF = 0;
    if (subtractT0) 
    TimeZeroTOF = event->GetT0();
  */
  Int_t ns=AliPID::kSPECIES;
  Double_t tpcPid[AliPID::kSPECIES];
  MakeTPCPID(track,tpcPid);
  Double_t itsPid[AliPID::kSPECIES];
  Double_t tofPid[AliPID::kSPECIES];
  Double_t trdPid[AliPID::kSPECIES];
  MakeITSPID(track,itsPid);
  MakeTOFPID(track,tofPid);
  //MakeHMPIDPID(track);
  MakeTRDPID(track,trdPid);
  for (Int_t j=0; j<ns; j++) {
    p[j]=tpcPid[j]*itsPid[j]*tofPid[j]*trdPid[j];
  }

  return 0;
}
//_________________________________________________________________________
void AliAODpidUtil::MakeTPCPID(AliAODTrack *track,Double_t *p) const
{
  //
  //  TPC pid using bethe-bloch and gaussian response
  //

  if ((track->GetStatus()&AliESDtrack::kTPCin )==0) return;

  Double_t mom = track->P();
  AliAODPid *pidObj = track->GetDetPid();
  if (pidObj) mom = pidObj->GetTPCmomentum();
  UShort_t nTPCClus=pidObj->GetTPCsignalN();
   
  Double_t dedx=pidObj->GetTPCsignal(); 
  Bool_t mismatch=kTRUE;

  for (Int_t j=0; j<AliPID::kSPECIES; j++) {
    AliPID::EParticleType type=AliPID::EParticleType(j);
    Double_t bethe=fTPCResponse.GetExpectedSignal(mom,type); 
    Double_t sigma=fTPCResponse.GetExpectedSigma(mom,nTPCClus,type);
    if (TMath::Abs(dedx-bethe) > fRange*sigma) {
      p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
    } else {
      p[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
      mismatch=kFALSE;
    }

  }

  if (mismatch)
    for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1/AliPID::kSPECIES;


  return;
}
//_________________________________________________________________________
void AliAODpidUtil::MakeITSPID(AliAODTrack *track,Double_t *p) const
{
  //
  // ITS PID
  //  1) Truncated mean method
  //


  if ((track->GetStatus()&AliESDtrack::kITSin)==0) return;
  UChar_t clumap=track->GetITSClusterMap();
  Int_t nPointsForPid=0;
  for(Int_t i=2; i<6; i++){
   if(clumap&(1<<i)) ++nPointsForPid;
  }
  if(nPointsForPid<3) { // track not to be used for combined PID purposes
    for (Int_t j=0; j<AliPID::kSPECIES; j++) 
      p[j] = 1./AliPID::kSPECIES;
    return;
  }
  Double_t mom=track->P();  
  AliAODPid *pidObj = track->GetDetPid();

  Double_t dedx = pidObj->GetITSsignal();
  Bool_t mismatch = kTRUE;
  Bool_t isSA = kTRUE;
  if(track->GetStatus() & AliESDtrack::kTPCin){
    isSA = kFALSE;
    if (pidObj)
      mom = pidObj->GetTPCmomentum();
  }
  for (Int_t j=0; j<AliPID::kSPECIES; j++) {
    Double_t mass = AliPID::ParticleMass(j);//GeV/c^2
    Double_t bethe = fITSResponse.Bethe(mom,mass);
    Double_t sigma = fITSResponse.GetResolution(bethe,nPointsForPid,isSA);
    if (TMath::Abs(dedx-bethe) > fRange*sigma) {
      p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
    } else {
      p[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
      mismatch=kFALSE;
    }

    // Check for particles heavier than (AliPID::kSPECIES - 1)

  }

  if (mismatch)
    for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;

  return;

}
//_________________________________________________________________________
void AliAODpidUtil::MakeTOFPID(AliAODTrack *track, Double_t *p) const
{
  //
  //   TOF PID using gaussian response
  //
  if ((track->GetStatus()&AliESDtrack::kTOFout )==0)    return;
  if ((track->GetStatus()&AliESDtrack::kTIME )==0)     return;
  if ((track->GetStatus()&AliESDtrack::kTOFpid )==0)   return;

  Double_t time[AliPID::kSPECIESN];
  Double_t sigma[AliPID::kSPECIESN];
  AliAODPid *pidObj = track->GetDetPid();
  pidObj->GetIntegratedTimes(time);

  for (Int_t iPart = 0; iPart < AliPID::kSPECIES; iPart++) {
    sigma[iPart] = fTOFResponse.GetExpectedSigma(track->P(),time[iPart],AliPID::ParticleMass(iPart));
  }

  AliDebugGeneral("AliESDpid::MakeTOFPID",2,
		  Form("Expected TOF signals [ps]: %f %f %f %f %f",
		       time[AliPID::kElectron],
		       time[AliPID::kMuon],
		       time[AliPID::kPion],
		       time[AliPID::kKaon],
		       time[AliPID::kProton]));

  AliDebugGeneral("AliESDpid::MakeTOFPID",2,
		  Form("Expected TOF std deviations [ps]: %f %f %f %f %f",
		       sigma[AliPID::kElectron],
		       sigma[AliPID::kMuon],
		       sigma[AliPID::kPion],
		       sigma[AliPID::kKaon],
		       sigma[AliPID::kProton]
		       ));

  Double_t tof = pidObj->GetTOFsignal();

  Bool_t mismatch = kTRUE;
  for (Int_t j=0; j<AliPID::kSPECIES; j++) {
    Double_t sig = sigma[j];
    if (TMath::Abs(tof-time[j]) > fRange*sig) {
      p[j] = TMath::Exp(-0.5*fRange*fRange)/sig;
    } else
      p[j] = TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sig*sig))/sig;

    // Check the mismatching
    Double_t mass = AliPID::ParticleMass(j);
    Double_t pm = fTOFResponse.GetMismatchProbability(track->P(),mass);
    if (p[j]>pm) mismatch = kFALSE;

    // Check for particles heavier than (AliPID::kSPECIES - 1)

  }

  if (mismatch)
    for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1/AliPID::kSPECIES;

  return;
}
//_________________________________________________________________________
void AliAODpidUtil::MakeTRDPID(AliAODTrack *track,Double_t *p) const
{
  
  // Method to recalculate the TRD PID probabilities
  if ((track->GetStatus()&AliESDtrack::kTRDout )==0)   return;

  AliAODPid *pidObj = track->GetDetPid();
  Float_t *mom=pidObj->GetTRDmomentum();
  Int_t ntracklets=0;
  for(Int_t iPl=0;iPl<6;iPl++){
   if(mom[iPl]>0.) ntracklets++;
  }
   if(ntracklets<4) return;

  Double_t* dedx=pidObj->GetTRDsignal();
  Bool_t norm=kTRUE;
  fTRDResponse.GetResponse(pidObj->GetTRDnSlices(),dedx,mom,p,norm);
  return;
}
Commit	Line	Data
1423bac9	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	/* $Id: AliAODpidUtil.cxx 38329 2010-01-17 19:17:24Z hristov $ */
	17
	18	//-----------------------------------------------------------------
	19	// Implementation of the combined PID class
	20	// For the AOD Class
	21	// containing information on the particle identification
	22	// Origin: Rosa Romita, GSI, r.romita@gsi.de
	23	//-----------------------------------------------------------------
	24
	25	#include "AliLog.h"
	26	#include "AliPID.h"
	27	#include "AliAODpidUtil.h"
	28	#include "AliAODEvent.h"
	29	#include "AliAODTrack.h"
	30	#include "AliAODPid.h"
	31	#include "AliTRDPIDResponse.h"
1c2fc6e0	32	#include "AliESDtrack.h"
1423bac9	33
	34	ClassImp(AliAODpidUtil)
	35
1c2fc6e0	36	Int_t AliAODpidUtil::MakePID(AliAODTrack track,Double_t p) const {
1423bac9	37	//
	38	// Calculate probabilities for all detectors, except if TPConly==kTRUE
	39	// and combine PID
	40	//
	41	// Option TPConly==kTRUE is used during reconstruction,
	42	// because ITS tracking uses TPC pid
	43	// HMPID and TRD pid are done in detector reconstructors
	44	//
	45
	46	/*
	47	Float_t TimeZeroTOF = 0;
	48	if (subtractT0)
	49	TimeZeroTOF = event->GetT0();
	50	*/
	51	Int_t ns=AliPID::kSPECIES;
	52	Double_t tpcPid[AliPID::kSPECIES];
	53	MakeTPCPID(track,tpcPid);
	54	Double_t itsPid[AliPID::kSPECIES];
	55	Double_t tofPid[AliPID::kSPECIES];
	56	Double_t trdPid[AliPID::kSPECIES];
	57	MakeITSPID(track,itsPid);
1c2fc6e0	58	MakeTOFPID(track,tofPid);
1423bac9	59	//MakeHMPIDPID(track);
	60	MakeTRDPID(track,trdPid);
	61	for (Int_t j=0; j<ns; j++) {
	62	p[j]=tpcPid[j]itsPid[j]tofPid[j]*trdPid[j];
	63	}
	64
	65	return 0;
	66	}
	67	//_________________________________________________________________________
	68	void AliAODpidUtil::MakeTPCPID(AliAODTrack track,Double_t p) const
	69	{
	70	//
	71	// TPC pid using bethe-bloch and gaussian response
	72	//
	73
1c2fc6e0	74	if ((track->GetStatus()&AliESDtrack::kTPCin )==0) return;
1c2fc6e0	75
1423bac9	76	Double_t mom = track->P();
	77	AliAODPid *pidObj = track->GetDetPid();
	78	if (pidObj) mom = pidObj->GetTPCmomentum();
597b16d8	79	UShort_t nTPCClus=pidObj->GetTPCsignalN();
1423bac9	80
	81	Double_t dedx=pidObj->GetTPCsignal();
	82	Bool_t mismatch=kTRUE;
	83
	84	for (Int_t j=0; j<AliPID::kSPECIES; j++) {
	85	AliPID::EParticleType type=AliPID::EParticleType(j);
	86	Double_t bethe=fTPCResponse.GetExpectedSignal(mom,type);
1c2fc6e0	87	Double_t sigma=fTPCResponse.GetExpectedSigma(mom,nTPCClus,type);
1423bac9	88	if (TMath::Abs(dedx-bethe) > fRange*sigma) {
	89	p[j]=TMath::Exp(-0.5fRangefRange)/sigma;
	90	} else {
	91	p[j]=TMath::Exp(-0.5(dedx-bethe)(dedx-bethe)/(sigma*sigma))/sigma;
	92	mismatch=kFALSE;
	93	}
	94
	95	}
	96
	97	if (mismatch)
	98	for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1/AliPID::kSPECIES;
	99
	100
	101	return;
	102	}
	103	//_________________________________________________________________________
	104	void AliAODpidUtil::MakeITSPID(AliAODTrack track,Double_t p) const
	105	{
	106	//
	107	// ITS PID
	108	// 1) Truncated mean method
	109	//
	110
	111
1c2fc6e0	112	if ((track->GetStatus()&AliESDtrack::kITSin)==0) return;
	113	UChar_t clumap=track->GetITSClusterMap();
	114	Int_t nPointsForPid=0;
	115	for(Int_t i=2; i<6; i++){
	116	if(clumap&(1<<i)) ++nPointsForPid;
	117	}
15e979c9	118	if(nPointsForPid<3) { // track not to be used for combined PID purposes
	119	for (Int_t j=0; j<AliPID::kSPECIES; j++)
	120	p[j] = 1./AliPID::kSPECIES;
	121	return;
	122	}
1423bac9	123	Double_t mom=track->P();
	124	AliAODPid *pidObj = track->GetDetPid();
	125
15e979c9	126	Double_t dedx = pidObj->GetITSsignal();
	127	Bool_t mismatch = kTRUE;
	128	Bool_t isSA = kTRUE;
	129	if(track->GetStatus() & AliESDtrack::kTPCin){
	130	isSA = kFALSE;
	131	if (pidObj)
	132	mom = pidObj->GetTPCmomentum();
	133	}
1423bac9	134	for (Int_t j=0; j<AliPID::kSPECIES; j++) {
15e979c9	135	Double_t mass = AliPID::ParticleMass(j);//GeV/c^2
	136	Double_t bethe = fITSResponse.Bethe(mom,mass);
	137	Double_t sigma = fITSResponse.GetResolution(bethe,nPointsForPid,isSA);
1423bac9	138	if (TMath::Abs(dedx-bethe) > fRange*sigma) {
	139	p[j]=TMath::Exp(-0.5fRangefRange)/sigma;
	140	} else {
	141	p[j]=TMath::Exp(-0.5(dedx-bethe)(dedx-bethe)/(sigma*sigma))/sigma;
	142	mismatch=kFALSE;
	143	}
	144
	145	// Check for particles heavier than (AliPID::kSPECIES - 1)
	146
	147	}
	148
	149	if (mismatch)
	150	for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
	151
	152	return;
	153
	154	}
	155	//_________________________________________________________________________
1c2fc6e0	156	void AliAODpidUtil::MakeTOFPID(AliAODTrack track, Double_t p) const
1423bac9	157	{
	158	//
	159	// TOF PID using gaussian response
	160	//
1c2fc6e0	161	if ((track->GetStatus()&AliESDtrack::kTOFout )==0) return;
	162	if ((track->GetStatus()&AliESDtrack::kTIME )==0) return;
	163	if ((track->GetStatus()&AliESDtrack::kTOFpid )==0) return;
1423bac9	164
	165	Double_t time[AliPID::kSPECIESN];
	166	Double_t sigma[AliPID::kSPECIESN];
	167	AliAODPid *pidObj = track->GetDetPid();
	168	pidObj->GetIntegratedTimes(time);
	169
	170	for (Int_t iPart = 0; iPart < AliPID::kSPECIES; iPart++) {
	171	sigma[iPart] = fTOFResponse.GetExpectedSigma(track->P(),time[iPart],AliPID::ParticleMass(iPart));
	172	}
	173
	174	AliDebugGeneral("AliESDpid::MakeTOFPID",2,
	175	Form("Expected TOF signals [ps]: %f %f %f %f %f",
	176	time[AliPID::kElectron],
	177	time[AliPID::kMuon],
	178	time[AliPID::kPion],
	179	time[AliPID::kKaon],
	180	time[AliPID::kProton]));
	181
	182	AliDebugGeneral("AliESDpid::MakeTOFPID",2,
	183	Form("Expected TOF std deviations [ps]: %f %f %f %f %f",
	184	sigma[AliPID::kElectron],
	185	sigma[AliPID::kMuon],
	186	sigma[AliPID::kPion],
	187	sigma[AliPID::kKaon],
	188	sigma[AliPID::kProton]
	189	));
	190
1c2fc6e0	191	Double_t tof = pidObj->GetTOFsignal();
1423bac9	192
	193	Bool_t mismatch = kTRUE;
	194	for (Int_t j=0; j<AliPID::kSPECIES; j++) {
	195	Double_t sig = sigma[j];
	196	if (TMath::Abs(tof-time[j]) > fRange*sig) {
	197	p[j] = TMath::Exp(-0.5fRangefRange)/sig;
	198	} else
	199	p[j] = TMath::Exp(-0.5(tof-time[j])(tof-time[j])/(sig*sig))/sig;
	200
	201	// Check the mismatching
	202	Double_t mass = AliPID::ParticleMass(j);
	203	Double_t pm = fTOFResponse.GetMismatchProbability(track->P(),mass);
	204	if (p[j]>pm) mismatch = kFALSE;
	205
	206	// Check for particles heavier than (AliPID::kSPECIES - 1)
	207
	208	}
	209
	210	if (mismatch)
	211	for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1/AliPID::kSPECIES;
	212
	213	return;
	214	}
	215	//_________________________________________________________________________
	216	void AliAODpidUtil::MakeTRDPID(AliAODTrack track,Double_t p) const
	217	{
	218
	219	// Method to recalculate the TRD PID probabilities
1c2fc6e0	220	if ((track->GetStatus()&AliESDtrack::kTRDout )==0) return;
1c2fc6e0	221
1423bac9	222	AliAODPid *pidObj = track->GetDetPid();
1423bac9	223	Float_t *mom=pidObj->GetTRDmomentum();
1c2fc6e0	224	Int_t ntracklets=0;
	225	for(Int_t iPl=0;iPl<6;iPl++){
	226	if(mom[iPl]>0.) ntracklets++;
	227	}
	228	if(ntracklets<4) return;
	229
	230	Double_t* dedx=pidObj->GetTRDsignal();
1423bac9	231	Bool_t norm=kTRUE;
30d69fa9	232	fTRDResponse.GetResponse(pidObj->GetTRDnSlices(),dedx,mom,p,norm);
1423bac9	233	return;
1423bac9	234	}