// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
//-----------------------------------------------------------------
+#include "TArrayI.h"
+#include "TArrayF.h"
+
+#include "AliLog.h"
+#include "AliPID.h"
+#include "AliTOFHeader.h"
#include "AliESDpid.h"
#include "AliESDEvent.h"
#include "AliESDtrack.h"
ClassImp(AliESDpid)
+Int_t AliESDpid::MakePID(AliESDEvent *event, Bool_t TPConly, Float_t timeZeroTOF) 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 nTrk=event->GetNumberOfTracks();
+ for (Int_t iTrk=0; iTrk<nTrk; iTrk++) {
+ AliESDtrack *track=event->GetTrack(iTrk);
+ MakeTPCPID(track);
+ if (!TPConly) {
+ MakeITSPID(track);
+ MakeTOFPID(track, timeZeroTOF);
+ //MakeHMPIDPID(track);
+ //MakeTRDPID(track);
+ }
+ CombinePID(track);
+ }
+ return 0;
+}
+//_________________________________________________________________________
+void AliESDpid::MakeTPCPID(AliESDtrack *track) const
+{
+ //
+ // TPC pid using bethe-bloch and gaussian response
+ //
+ if ((track->GetStatus()&AliESDtrack::kTPCin )==0)
+ if ((track->GetStatus()&AliESDtrack::kTPCout)==0) return;
+
+ Double_t mom = track->GetP();
+ const AliExternalTrackParam *in=track->GetInnerParam();
+ if (in) mom = in->GetP();
+
+ Double_t p[AliPID::kSPECIES];
+ Double_t dedx=track->GetTPCsignal();
+ Bool_t mismatch=kTRUE, heavy=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,track->GetTPCsignalN(),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;
+ }
+
+ // Check for particles heavier than (AliPID::kSPECIES - 1)
+ if (dedx < (bethe + fRange*sigma)) heavy=kFALSE;
+
+ }
+
+ if (mismatch)
+ for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
+
+ track->SetTPCpid(p);
+
+ if (heavy) track->ResetStatus(AliESDtrack::kTPCpid);
+
+}
+//_________________________________________________________________________
+void AliESDpid::MakeITSPID(AliESDtrack *track) const
+{
+ //
+ // ITS PID
+ // Two options, depending on fITSPIDmethod:
+ // 1) Truncated mean method
+ // 2) Likelihood, using charges measured in all 4 layers and
+ // Landau+gaus response functions
+ //
+
+ if ((track->GetStatus()&AliESDtrack::kITSin)==0 &&
+ (track->GetStatus()&AliESDtrack::kITSout)==0) return;
+
+ Double_t mom=track->GetP();
+ if (fITSPIDmethod == kITSTruncMean) {
+ Double_t dedx=track->GetITSsignal();
+ Bool_t isSA=kTRUE;
+ Double_t momITS=mom;
+ ULong_t trStatus=track->GetStatus();
+ if(trStatus&AliESDtrack::kTPCin) isSA=kFALSE;
+ 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
+ track->ResetStatus(AliESDtrack::kITSpid);
+ return;
+ }
+
+ Double_t p[10];
+
+ Bool_t mismatch=kTRUE, heavy=kTRUE;
+ for (Int_t j=0; j<AliPID::kSPECIES; j++) {
+ Double_t mass=AliPID::ParticleMass(j);//GeV/c^2
+ Double_t bethe=fITSResponse.Bethe(momITS,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 (dedx < (bethe + fRange*sigma)) heavy=kFALSE;
+
+ }
+
+ if (mismatch)
+ for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
+
+ track->SetITSpid(p);
+
+ if (heavy) track->ResetStatus(AliESDtrack::kITSpid);
+ }
+ else { // Likelihood method
+ Double_t condprobfun[AliPID::kSPECIES];
+ Double_t qclu[4];
+ track->GetITSdEdxSamples(qclu);
+ fITSResponse.GetITSProbabilities(mom,qclu,condprobfun);
+ track->SetITSpid(condprobfun);
+ }
+
+}
+//_________________________________________________________________________
+void AliESDpid::MakeTOFPID(AliESDtrack *track, Float_t /*timeZeroTOF*/) const
+{
+ //
+ // TOF PID using gaussian response
+ //
+
+ if ((track->GetStatus()&AliESDtrack::kTOFout)==0) return;
+ if ((track->GetStatus()&AliESDtrack::kTIME)==0) return;
+
+ Int_t ibin = fTOFResponse.GetMomBin(track->GetP());
+ Float_t timezero = fTOFResponse.GetT0bin(ibin);
+
+ Double_t time[AliPID::kSPECIESN];
+ track->GetIntegratedTimes(time);
+
+ Double_t sigma[AliPID::kSPECIES];
+ for (Int_t iPart = 0; iPart < AliPID::kSPECIES; iPart++) {
+ sigma[iPart] = fTOFResponse.GetExpectedSigma(track->GetP(),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 = track->GetTOFsignal() - timezero;
+
+ Double_t p[AliPID::kSPECIES];
+ Bool_t mismatch = kTRUE, heavy = kTRUE;
+ for (Int_t j=0; j<AliPID::kSPECIES; j++) {
+ Double_t sig = sigma[j];
+ if (TMath::Abs(tof-time[j]) > (fRange+2)*sig) {
+ p[j] = TMath::Exp(-0.5*(fRange+2)*(fRange+2))/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->GetP(),mass);
+ if (p[j]>pm) mismatch = kFALSE;
+
+ // Check for particles heavier than (AliPID::kSPECIES - 1)
+ if (tof < (time[j] + fRange*sig)) heavy=kFALSE;
+
+ }
+
+ if (mismatch)
+ for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1./AliPID::kSPECIES;
+
+ track->SetTOFpid(p);
+
+ if (heavy) track->ResetStatus(AliESDtrack::kTOFpid);
+ if (!CheckTOFMatching(track)) track->SetStatus(AliESDtrack::kTOFmismatch);
+
+}
//_________________________________________________________________________
-Int_t AliESDpid::MakePID(AliESDEvent *event)
+void AliESDpid::MakeTRDPID(AliESDtrack *track) const
+{
+ //
+ // Method to recalculate the TRD PID probabilities
+ //
+ if((track->GetStatus()&AliESDtrack::kTRDout)==0) return;
+ Double_t prob[AliPID::kSPECIES]; Float_t mom[6];
+ Double_t dedx[48]; // Allocate space for the maximum number of TRD slices
+ for(Int_t ilayer = 0; ilayer < 6; ilayer++){
+ mom[ilayer] = track->GetTRDmomentum(ilayer);
+ for(Int_t islice = 0; islice < track->GetNumberOfTRDslices(); islice++){
+ dedx[ilayer*track->GetNumberOfTRDslices()+islice] = track->GetTRDslice(ilayer, islice);
+ }
+ }
+ fTRDResponse.GetResponse(track->GetNumberOfTRDslices(), dedx, mom, prob);
+ track->SetTRDpid(prob);
+}
+//_________________________________________________________________________
+void AliESDpid::CombinePID(AliESDtrack *track) const
{
//
// Combine the information of various detectors
// to determine the Particle Identification
//
- Int_t ntrk=event->GetNumberOfTracks();
- for (Int_t i=0; i<ntrk; i++) {
- Int_t ns=AliPID::kSPECIES;
- Double_t p[10]={1.,1.,1.,1.,1.,1.,1.,1.,1.,1.};
- const Double_t keps=1e-13;
-
- AliESDtrack *t=event->GetTrack(i);
-
- if ((t->GetStatus()&AliESDtrack::kITSpid )!=0) {
- Double_t d[10];
- t->GetITSpid(d);
- Int_t j, ok=0;
- for (j=0; j<ns; j++) if (d[j]>keps) ok=1;
- if (ok)
- for (j=0; j<ns; j++) p[j]*=d[j];
+ Int_t ns=AliPID::kSPECIES;
+ Double_t p[10]={1.,1.,1.,1.,1.,1.,1.,1.,1.,1.};
+
+ if (track->IsOn(AliESDtrack::kITSpid)) {
+ Double_t d[10];
+ track->GetITSpid(d);
+ for (Int_t j=0; j<ns; j++) p[j]*=d[j];
+ }
+
+ if (track->IsOn(AliESDtrack::kTPCpid)) {
+ Double_t d[10];
+ track->GetTPCpid(d);
+ for (Int_t j=0; j<ns; j++) p[j]*=d[j];
+ }
+
+ if (track->IsOn(AliESDtrack::kTRDpid)) {
+ Double_t d[10];
+ track->GetTRDpid(d);
+ for (Int_t j=0; j<ns; j++) p[j]*=d[j];
+ }
+
+ if (track->IsOn(AliESDtrack::kTOFpid)) {
+ Double_t d[10];
+ track->GetTOFpid(d);
+ for (Int_t j=0; j<ns; j++) p[j]*=d[j];
+ }
+
+ if (track->IsOn(AliESDtrack::kHMPIDpid)) {
+ Double_t d[10];
+ track->GetHMPIDpid(d);
+ for (Int_t j=0; j<ns; j++) p[j]*=d[j];
+ }
+
+ track->SetESDpid(p);
+}
+//_________________________________________________________________________
+Bool_t AliESDpid::CheckTOFMatching(AliESDtrack *track) const{
+ Bool_t status = kFALSE;
+
+ Double_t exptimes[5];
+ track->GetIntegratedTimes(exptimes);
+
+ Float_t p = track->P();
+
+ Float_t dedx = track->GetTPCsignal();
+ Float_t time = track->GetTOFsignal() - fTOFResponse.GetStartTime(p);
+
+ Double_t ptpc[3];
+ track->GetInnerPxPyPz(ptpc);
+ Float_t momtpc=TMath::Sqrt(ptpc[0]*ptpc[0] + ptpc[1]*ptpc[1] + ptpc[2]*ptpc[2]);
+
+ for(Int_t i=0;i < 5;i++){
+ AliPID::EParticleType type=AliPID::EParticleType(i);
+
+ Float_t resolutionTOF = fTOFResponse.GetExpectedSigma(p, exptimes[i], AliPID::ParticleMass(i));
+ if(TMath::Abs(exptimes[i] - time) < fRange * resolutionTOF){
+ Float_t dedxExp = fTPCResponse.GetExpectedSignal(momtpc,type);
+ Float_t resolutionTPC = fTPCResponse.GetExpectedSigma(momtpc,track->GetTPCsignalN(),type);
+
+ if(TMath::Abs(dedx - dedxExp) < fRangeTOFMismatch * resolutionTPC){
+ status = kTRUE;
+ }
+ }
+ }
+
+ // for nuclei
+ Float_t resolutionTOFpr = fTOFResponse.GetExpectedSigma(p, exptimes[4], AliPID::ParticleMass(4));
+ if(!status && (exptimes[4] + fRange*resolutionTOFpr < time)) status = kTRUE;
+
+
+ return status;
+}
+//_________________________________________________________________________
+void AliESDpid::SetTOFResponse(AliESDEvent *event,EStartTimeType_t option){
+ //
+ // Set TOF response function
+ // Input option for event_time used
+ //
+
+ Float_t t0spread = 0.; //event->GetEventTimeSpread();
+ if(t0spread < 10) t0spread = 80;
+
+ // T0 from TOF algorithm
+
+ Bool_t flagT0TOF=kFALSE;
+ Bool_t flagT0T0=kFALSE;
+ Float_t *startTime = new Float_t[fTOFResponse.GetNmomBins()];
+ Float_t *startTimeRes = new Float_t[fTOFResponse.GetNmomBins()];
+ Int_t *startTimeMask = new Int_t[fTOFResponse.GetNmomBins()];
+
+ // T0-TOF arrays
+ Float_t *estimatedT0event = new Float_t[fTOFResponse.GetNmomBins()];
+ Float_t *estimatedT0resolution = new Float_t[fTOFResponse.GetNmomBins()];
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ estimatedT0event[i]=0.0;
+ estimatedT0resolution[i]=0.0;
+ startTimeMask[i] = 0;
}
- if ((t->GetStatus()&AliESDtrack::kTPCpid )!=0) {
- Double_t d[10];
- t->GetTPCpid(d);
- Int_t j, ok=0;
- for (j=0; j<ns; j++) if (d[j]>keps) ok=1;
- if (ok)
- for (j=0; j<ns; j++) p[j]*=d[j];
+ Float_t resT0A=75,resT0C=65,resT0AC=55;
+ if(event->GetT0TOF()){ // check if T0 detector information is available
+ flagT0T0=kTRUE;
}
- if ((t->GetStatus()&AliESDtrack::kTRDpid )!=0) {
- Double_t d[10];
- t->GetTRDpid(d);
- Int_t j, ok=0;
- for (j=0; j<ns; j++) if (d[j]>keps) ok=1;
- if (ok)
- for (j=0; j<ns; j++) p[j]*=d[j];
+
+ AliTOFHeader *tofHeader =(AliTOFHeader*)event->GetTOFHeader();
+
+ if(tofHeader){ // read global info and T0-TOF info from ESD
+ fTOFResponse.SetTimeResolution(tofHeader->GetTOFResolution());
+ t0spread = tofHeader->GetT0spread(); // read t0 sprad
+ if(t0spread < 10) t0spread = 80;
+
+ flagT0TOF=kTRUE;
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){ // read T0-TOF default value
+ startTime[i]=tofHeader->GetDefaultEventTimeVal();
+ startTimeRes[i]=tofHeader->GetDefaultEventTimeRes();
+ }
+
+ TArrayI *ibin=tofHeader->GetNvalues();
+ TArrayF *t0Bin=tofHeader->GetEventTimeValues();
+ TArrayF *t0ResBin=tofHeader->GetEventTimeRes();
+ for(Int_t j=0;j < tofHeader->GetNbins();j++){ // fill T0-TOF in p-bins
+ Int_t icurrent = (Int_t)ibin->GetAt(j);
+ startTime[icurrent]=t0Bin->GetAt(j);
+ startTimeRes[icurrent]=t0ResBin->GetAt(j);
+ }
}
- if (t->GetP()>0.7) // accept the TOF only for the high momenta
- if ((t->GetStatus()&AliESDtrack::kTOFpid )!=0) {
- Double_t d[10];
- t->GetTOFpid(d);
- Int_t j, ok=0;
- for (j=0; j<ns; j++) if (d[j]>keps) ok=1;
- if (ok)
- for (j=0; j<ns; j++) p[j]*=d[j];
+ // for cut of 3 sigma on t0 spread
+ Float_t t0cut = 3 * t0spread;
+ if(t0cut < 500) t0cut = 500;
+
+ if(option == kFILL_T0){ // T0-FILL is used
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ estimatedT0event[i]=0.0;
+ estimatedT0resolution[i]=t0spread;
+ }
+ fTOFResponse.SetT0event(estimatedT0event);
+ fTOFResponse.SetT0resolution(estimatedT0resolution);
}
- if ((t->GetStatus()&AliESDtrack::kHMPIDpid )!=0) {
- Double_t d[10];
- t->GetHMPIDpid(d);
- Int_t j, ok=0;
- for (j=0; j<ns; j++) if (d[j]>keps) ok=1;
- if (ok)
- for (j=0; j<ns; j++) p[j]*=d[j];
+ if(option == kTOF_T0){ // T0-TOF is used when available (T0-FILL otherwise) from ESD
+ if(flagT0TOF){
+ fTOFResponse.SetT0event(startTime);
+ fTOFResponse.SetT0resolution(startTimeRes);
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ if(startTimeRes[i]<t0spread) startTimeMask[i]=1;
+ fTOFResponse.SetT0binMask(i,startTimeMask[i]);
+ }
+ }
+ else{
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ estimatedT0event[i]=0.0;
+ estimatedT0resolution[i]=t0spread;
+ fTOFResponse.SetT0binMask(i,startTimeMask[i]);
+ }
+ fTOFResponse.SetT0event(estimatedT0event);
+ fTOFResponse.SetT0resolution(estimatedT0resolution);
+ }
}
+ else if(option == kBest_T0){ // T0-T0 or T0-TOF are used when available (T0-FILL otherwise) from ESD
+ Float_t t0AC=-10000;
+ Float_t t0A=-10000;
+ Float_t t0C=-10000;
+ if(flagT0T0){
+ t0AC= event->GetT0TOF()[0];
+ t0A= event->GetT0TOF()[1];
+ t0C= event->GetT0TOF()[2];
+ }
- t->SetESDpid(p);
- }
- return 0;
+ Float_t t0t0Best = 0;
+ Float_t t0t0BestRes = 9999;
+ Int_t t0used=0;
+ if(TMath::Abs(t0A) < t0cut && TMath::Abs(t0C) < t0cut && TMath::Abs(t0C-t0A) < 500){
+ t0t0Best = t0AC;
+ t0t0BestRes = resT0AC;
+ t0used=6;
+ }
+ else if(TMath::Abs(t0C) < t0cut){
+ t0t0Best = t0C;
+ t0t0BestRes = resT0C;
+ t0used=4;
+ }
+ else if(TMath::Abs(t0A) < t0cut){
+ t0t0Best = t0A;
+ t0t0BestRes = resT0A;
+ t0used=2;
+ }
+
+ if(flagT0TOF){ // if T0-TOF info is available
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ if(t0t0BestRes < 999){
+ if(startTimeRes[i] < t0spread){
+ Double_t wtot = 1./startTimeRes[i]/startTimeRes[i] + 1./t0t0BestRes/t0t0BestRes;
+ Double_t t0best = startTime[i]/startTimeRes[i]/startTimeRes[i] + t0t0Best/t0t0BestRes/t0t0BestRes;
+ estimatedT0event[i]=t0best / wtot;
+ estimatedT0resolution[i]=1./TMath::Sqrt(wtot);
+ startTimeMask[i] = t0used+1;
+ }
+ else {
+ estimatedT0event[i]=t0t0Best;
+ estimatedT0resolution[i]=t0t0BestRes;
+ startTimeMask[i] = t0used;
+ }
+ }
+ else{
+ estimatedT0event[i]=startTime[i];
+ estimatedT0resolution[i]=startTimeRes[i];
+ if(startTimeRes[i]<t0spread) startTimeMask[i]=1;
+ }
+ fTOFResponse.SetT0binMask(i,startTimeMask[i]);
+ }
+ fTOFResponse.SetT0event(estimatedT0event);
+ fTOFResponse.SetT0resolution(estimatedT0resolution);
+ }
+ else{ // if no T0-TOF info is available
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ fTOFResponse.SetT0binMask(i,t0used);
+ if(t0t0BestRes < 999){
+ estimatedT0event[i]=t0t0Best;
+ estimatedT0resolution[i]=t0t0BestRes;
+ }
+ else{
+ estimatedT0event[i]=0.0;
+ estimatedT0resolution[i]=t0spread;
+ }
+ }
+ fTOFResponse.SetT0event(estimatedT0event);
+ fTOFResponse.SetT0resolution(estimatedT0resolution);
+ }
+ }
+
+ else if(option == kT0_T0){ // T0-T0 is used when available (T0-FILL otherwise) from ESD
+ Float_t t0AC=-10000;
+ Float_t t0A=-10000;
+ Float_t t0C=-10000;
+ if(flagT0T0){
+ t0AC= event->GetT0TOF()[0];
+ t0A= event->GetT0TOF()[1];
+ t0C= event->GetT0TOF()[2];
+ }
+
+ if(TMath::Abs(t0A) < t0cut && TMath::Abs(t0C) < t0cut && TMath::Abs(t0C-t0A) < 500){
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ estimatedT0event[i]=t0AC;
+ estimatedT0resolution[i]=resT0AC;
+ fTOFResponse.SetT0binMask(i,6);
+ }
+ }
+ else if(TMath::Abs(t0C) < t0cut){
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ estimatedT0event[i]=t0C;
+ estimatedT0resolution[i]=resT0C;
+ fTOFResponse.SetT0binMask(i,4);
+ }
+ }
+ else if(TMath::Abs(t0A) < t0cut){
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ estimatedT0event[i]=t0A;
+ estimatedT0resolution[i]=resT0A;
+ fTOFResponse.SetT0binMask(i,2);
+ }
+ }
+ else{
+ for(Int_t i=0;i<fTOFResponse.GetNmomBins();i++){
+ estimatedT0event[i]=0.0;
+ estimatedT0resolution[i]=t0spread;
+ fTOFResponse.SetT0binMask(i,0);
+ }
+ }
+ fTOFResponse.SetT0event(estimatedT0event);
+ fTOFResponse.SetT0resolution(estimatedT0resolution);
+ }
+ delete [] startTime;
+ delete [] startTimeRes;
+ delete [] startTimeMask;
+ delete [] estimatedT0event;
+ delete [] estimatedT0resolution;
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff