* provided "as is" without express or implied warranty. *
**************************************************************************/
-//-----------------------------------------------------------------
-// Implementation of the TOF PID class
-// Very naive one... Should be made better by the detector experts...
-// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
-//-----------------------------------------------------------------
-#include "TFile.h"
-#include "TTree.h"
-#include "TClonesArray.h"
+//-----------------------------------------------------------------//
+// //
+// Implementation of the TOF PID class //
+// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch //
+// //
+//-----------------------------------------------------------------//
-#include "AliTOFpidESD.h"
-#include "AliESD.h"
-#include "AliESDtrack.h"
-#include "AliTOFdigit.h"
+#include "TMath.h"
+#include "AliLog.h"
-#include <TGeant3.h>
-#include <TVirtualMC.h>
-#include "../STRUCT/AliBODY.h"
-#include "../STRUCT/AliFRAMEv2.h"
-#include "AliTOFv2FHoles.h"
+#include "AliESDtrack.h"
+#include "AliESDEvent.h"
+#include "AliTOFpidESD.h"
ClassImp(AliTOFpidESD)
-static Int_t InitGeo() {
- //gSystem->Load("libgeant321");
- //new TGeant3("C++ Interface to Geant3");
-
- AliBODY *BODY = new AliBODY("BODY", "Alice envelop");
- BODY->CreateGeometry();
-
- AliFRAMEv2 *FRAME = new AliFRAMEv2("FRAME", "Space Frame");
- FRAME->SetHoles(1);
- FRAME->CreateGeometry();
-
- AliTOF *TOF = new AliTOFv2FHoles("TOF", "TOF with Holes");
- TOF->CreateGeometry();
-
- return 0;
-}
-
//_________________________________________________________________________
-AliTOFpidESD::AliTOFpidESD(Double_t *param) throw (const Char_t *) {
+AliTOFpidESD::AliTOFpidESD():
+ fSigma(0),
+ fRange(0),
+ fPmax(0) // zero at 0.5 GeV/c for pp
+{
+}
+//_________________________________________________________________________
+AliTOFpidESD::AliTOFpidESD(Double_t *param):
+ fSigma(param[0]),
+ fRange(param[1]),
+ fPmax(0) // zero at 0.5 GeV/c for pp
+{
//
// The main constructor
//
- if (InitGeo()) throw "AliTOFpidESD: can not initialize the geomtry !\n";
-
- fR=376.; fDy=2.5; fDz=3.5; fN=0; fEventN=0;
-
- fSigma=param[0];
- fRange=param[1];
+ //
+ //fPmax=TMath::Exp(-0.5*3*3)/fSigma; // ~3 sigma at 0.5 GeV/c for PbPb
}
-static Int_t DtoM(Int_t *dig, Float_t *g) {
- const Int_t MAX=13;
- Int_t lnam[MAX],lnum[MAX];
-
- extern TVirtualMC *gMC;
-
- TGeant3 *geant3=(TGeant3*)gMC;
- if (!geant3) {cerr<<"no geant3 found !\n"; return 1;}
-
- strncpy((Char_t*)(lnam+0),"ALIC",4); lnum[0]=1;
- strncpy((Char_t*)(lnam+1),"B077",4); lnum[1]=1;
-
- //sector
- switch (dig[0]) {
- case 1:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=9;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- case 2:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=10;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- case 3:
- strncpy((Char_t*)(lnam+2),"B074",4); lnum[2]=4;
- strncpy((Char_t*)(lnam+3),"BTO2",4); lnum[3]=1;
- if (dig[1]>3) lnum[3]=2;
- break;
- case 4:
- strncpy((Char_t*)(lnam+2),"B074",4); lnum[2]=5;
- strncpy((Char_t*)(lnam+3),"BTO2",4); lnum[3]=1;
- if (dig[1]>3) lnum[3]=2;
- break;
- case 5:
- strncpy((Char_t*)(lnam+2),"B074",4); lnum[2]=1;
- strncpy((Char_t*)(lnam+3),"BTO2",4); lnum[3]=1;
- if (dig[1]>3) lnum[3]=2;
- break;
- case 6:
- strncpy((Char_t*)(lnam+2),"B074",4); lnum[2]=2;
- strncpy((Char_t*)(lnam+3),"BTO2",4); lnum[3]=1;
- if (dig[1]>3) lnum[3]=2;
- break;
- case 7:
- strncpy((Char_t*)(lnam+2),"B074",4); lnum[2]=3;
- strncpy((Char_t*)(lnam+3),"BTO2",4); lnum[3]=1;
- if (dig[1]>3) lnum[3]=2;
- break;
- case 8:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=1;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- case 9:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=2;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- case 10:
- strncpy((Char_t*)(lnam+2),"B075",4); lnum[2]=1;
- strncpy((Char_t*)(lnam+3),"BTO3",4); lnum[3]=1;
- if (dig[1]>4) lnum[3]=2;
- break;
- case 11:
- strncpy((Char_t*)(lnam+2),"B075",4); lnum[2]=2;
- strncpy((Char_t*)(lnam+3),"BTO3",4); lnum[3]=1;
- if (dig[1]>4) lnum[3]=2;
- break;
- case 12:
- strncpy((Char_t*)(lnam+2),"B075",4); lnum[2]=3;
- strncpy((Char_t*)(lnam+3),"BTO3",4); lnum[3]=1;
- if (dig[1]>4) lnum[3]=2;
- break;
- case 13:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=3;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- case 14:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=4;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- case 15:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=5;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- case 16:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=6;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- case 17:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=7;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- case 18:
- strncpy((Char_t*)(lnam+2),"B071",4); lnum[2]=8;
- strncpy((Char_t*)(lnam+3),"BTO1",4); lnum[3]=1;
- break;
- default:
- cerr<<"Wrong sector number : "<<dig[0]<<" !\n";
- return 2;
- }
- //module
- switch (dig[1]) {
- case 1:
- strncpy((Char_t*)(lnam+4),"FTOC",4); lnum[4]=1;
- if (dig[0]==1 || dig[0]==2 ) lnum[4]=2;
- if (dig[0]>=8 && dig[0]<=9) lnum[4]=2;
- if (dig[0]>=13 && dig[0]<=18) lnum[4]=2;
- strncpy((Char_t*)(lnam+5),"FLTC",4); lnum[5]=0;
- break;
- case 2:
- strncpy((Char_t*)(lnam+4),"FTOB",4); lnum[4]=1;
- if (dig[0]==1 || dig[0]==2 ) lnum[4]=2;
- if (dig[0]>=8 && dig[0]<=9) lnum[4]=2;
- if (dig[0]>=13 && dig[0]<=18) lnum[4]=2;
- strncpy((Char_t*)(lnam+5),"FLTB",4); lnum[5]=0;
- break;
- case 3:
- strncpy((Char_t*)(lnam+4),"FTOA",4); lnum[4]=0;
- strncpy((Char_t*)(lnam+5),"FLTA",4); lnum[5]=0;
- break;
- case 4:
- strncpy((Char_t*)(lnam+4),"FTOB",4); lnum[4]=1;
- strncpy((Char_t*)(lnam+5),"FLTB",4); lnum[5]=0;
- break;
- case 5:
- strncpy((Char_t*)(lnam+4),"FTOC",4); lnum[4]=1;
- strncpy((Char_t*)(lnam+5),"FLTC",4); lnum[5]=0;
- break;
- default:
- cerr<<"Wrong module number : "<<dig[1]<<" !\n";
- return 3;
- }
-
- //strip
- if (dig[2]<1 || dig[2]>19) {
- cerr<<"Wrong strip number : "<<dig[2]<<" !\n";
- return 3;
- }
- strncpy((Char_t*)(lnam+6),"FSTR",4); lnum[6]=dig[2];
- strncpy((Char_t*)(lnam+7),"FSEN",4); lnum[7]=0;
-
- //divz
- if (dig[3]<1 || dig[3]>2) {
- cerr<<"Wrong z-division number : "<<dig[3]<<" !\n";
- return 3;
- }
- strncpy((Char_t*)(lnam+8),"FSEZ",4); lnum[8]=dig[3];
+Double_t
+AliTOFpidESD::GetMismatchProbability(Double_t p, Double_t mass) const {
+ //
+ // Returns the probability of mismatching
+ // assuming 1/(p*beta)^2 scaling
+ //
+ const Double_t km=0.5; // "reference" momentum (GeV/c)
- //divx
- if (dig[4]<1 || dig[4]>48) {
- cerr<<"Wrong x-division number : "<<dig[4]<<" !\n";
- return 3;
- }
- strncpy((Char_t*)(lnam+9),"FSEX",4); lnum[9]=dig[4];
- strncpy((Char_t*)(lnam+10),"FPAD",4); lnum[10]=0;
+ Double_t ref2=km*km*km*km/(km*km + mass*mass);// "reference" (p*beta)^2
+ Double_t p2beta2=p*p*p*p/(p*p + mass*mass);
- Gcvolu_t *gcvolu=geant3->Gcvolu(); gcvolu->nlevel=0;
- Int_t err=geant3->Glvolu(11,lnam,lnum); //11-th level
- if (err) {cout<<err<<" Wrong volume !\n"; return 3;}
- Float_t l[3]={0.,0.,0}; geant3->Gdtom(l,g,1);
- return 0;
+ return fPmax*ref2/p2beta2;
}
-Int_t AliTOFpidESD::LoadClusters(const TFile *df) {
- //--------------------------------------------------------------------
- //This function loads the TOF clusters
- //--------------------------------------------------------------------
- if (!((TFile *)df)->IsOpen()) {
- Error("LoadClusters","file with the TOF digits has not been open !\n");
- return 1;
- }
-
- Char_t name[100];
- sprintf(name,"TreeD%d",GetEventNumber());
- TTree *dTree=(TTree*)((TFile *)df)->Get(name);
- if (!dTree) {
- Error("LoadClusters"," can't get the tree with digits !\n");
- return 1;
- }
- TBranch *branch=dTree->GetBranch("TOF");
- if (!branch) {
- Error("LoadClusters"," can't get the branch with the TOF digits !\n");
- return 1;
- }
-
- TClonesArray dummy("AliTOFdigit",10000), *digits=&dummy;
- branch->SetAddress(&digits);
-
- dTree->GetEvent(0);
- Int_t nd=digits->GetEntriesFast();
- Info("LoadClusters","number of digits: %d",nd);
-
- for (Int_t i=0; i<nd; i++) {
- AliTOFdigit *d=(AliTOFdigit*)digits->UncheckedAt(i);
- Int_t dig[5]; Float_t g[3];
- dig[0]=d->GetSector();
- dig[1]=d->GetPlate();
- dig[2]=d->GetStrip();
- dig[3]=d->GetPadz();
- dig[4]=d->GetPadx();
-
- DtoM(dig,g);
-
- Double_t h[5];
- h[0]=TMath::Sqrt(g[0]*g[0]+g[1]*g[1]);
- h[1]=TMath::ATan2(g[1],g[0]); h[2]=g[2];
- h[3]=d->GetTdc(); h[4]=d->GetAdc();
+//_________________________________________________________________________
+Int_t AliTOFpidESD::MakePID(AliESDEvent *event, Double_t timeZero)
+{
+ //
+ // This function calculates the "detector response" PID probabilities
+ // Just for a bare hint...
- AliTOFcluster *cl=new AliTOFcluster(h,d->GetTracks());
- InsertCluster(cl);
- }
+ AliDebug(1,Form("TOF PID Parameters: Sigma (ps)= %f, Range= %f",fSigma,fRange));
+ AliDebug(1,"++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \n");
- delete dTree;
- return 0;
-}
+ Int_t ntrk=event->GetNumberOfTracks();
+ AliESDtrack **tracks=new AliESDtrack*[ntrk];
-Int_t AliTOFpidESD::LoadClusters(TTree *dTree) {
- //--------------------------------------------------------------------
- //This function loads the TOF clusters
- //--------------------------------------------------------------------
- TBranch *branch=dTree->GetBranch("TOF");
- if (!branch) {
- Error("LoadClusters"," can't get the branch with the TOF digits !\n");
- return 1;
+ Int_t i;
+ for (i=0; i<ntrk; i++) {
+ AliESDtrack *t=event->GetTrack(i);
+ tracks[i]=t;
}
- TClonesArray dummy("AliTOFdigit",10000), *digits=&dummy;
- branch->SetAddress(&digits);
-
- dTree->GetEvent(0);
- Int_t nd=digits->GetEntriesFast();
- Info("LoadClusters","number of digits: %d",nd);
+ for (i=0; i<ntrk; i++) {
+ AliESDtrack *t=tracks[i];
+ if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
+ if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
+ Double_t tof=t->GetTOFsignal()-timeZero;
+ Double_t time[10]; t->GetIntegratedTimes(time);
+ Double_t p[10];
+ Double_t mom=t->GetP();
+ Bool_t mismatch=kTRUE, heavy=kTRUE;
+ for (Int_t j=0; j<AliPID::kSPECIES; j++) {
+ Double_t mass=AliPID::ParticleMass(j);
+ Double_t dpp=0.01; //mean relative pt resolution;
+ if (mom>0.5) dpp=0.01*mom;
+ Double_t sigma=dpp*time[j]/(1.+ mom*mom/(mass*mass));
+ sigma=TMath::Sqrt(sigma*sigma + fSigma*fSigma);
+ if (TMath::Abs(tof-time[j]) > fRange*sigma) {
+ p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
+ } else
+ p[j]=TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sigma*sigma))/sigma;
- for (Int_t i=0; i<nd; i++) {
- AliTOFdigit *d=(AliTOFdigit*)digits->UncheckedAt(i);
- Int_t dig[5]; Float_t g[3];
- dig[0]=d->GetSector();
- dig[1]=d->GetPlate();
- dig[2]=d->GetStrip();
- dig[3]=d->GetPadz();
- dig[4]=d->GetPadx();
+ // Check the mismatching
+ Double_t pm=GetMismatchProbability(mom,mass);
+ if (p[j]>pm) mismatch=kFALSE;
- DtoM(dig,g);
+ // Check for particles heavier than (AliPID::kSPECIES - 1)
+ if (tof < (time[j] + fRange*sigma)) heavy=kFALSE;
- Double_t h[5];
- h[0]=TMath::Sqrt(g[0]*g[0]+g[1]*g[1]);
- h[1]=TMath::ATan2(g[1],g[0]); h[2]=g[2];
- h[3]=d->GetTdc(); h[4]=d->GetAdc();
+ }
- AliTOFcluster *cl=new AliTOFcluster(h,d->GetTracks());
- InsertCluster(cl);
- }
+ if (mismatch)
+ for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1/AliPID::kSPECIES;
- return 0;
-}
+ t->SetTOFpid(p);
-void AliTOFpidESD::UnloadClusters() {
- //--------------------------------------------------------------------
- //This function unloads TOF clusters
- //--------------------------------------------------------------------
- for (Int_t i=0; i<fN; i++) delete fClusters[i];
- fN=0;
-}
+ if (heavy) t->ResetStatus(AliESDtrack::kTOFpid);
-Int_t AliTOFpidESD::InsertCluster(AliTOFcluster *c) {
- //--------------------------------------------------------------------
- //This function adds a cluster to the array of clusters sorted in Z
- //--------------------------------------------------------------------
- if (fN==kMaxCluster) {
- Error("InsertCluster","Too many clusters !\n");
- return 1;
}
- if (fN==0) {fClusters[fN++]=c; return 0;}
- Int_t i=FindClusterIndex(c->GetZ());
- memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliTOFcluster*));
- fClusters[i]=c; fN++;
-
+ delete[] tracks;
+
return 0;
}
-Int_t AliTOFpidESD::FindClusterIndex(Double_t z) const {
- //--------------------------------------------------------------------
- // This function returns the index of the nearest cluster
- //--------------------------------------------------------------------
- if (fN==0) return 0;
- if (z <= fClusters[0]->GetZ()) return 0;
- if (z > fClusters[fN-1]->GetZ()) return fN;
- Int_t b=0, e=fN-1, m=(b+e)/2;
- for (; b<e; m=(b+e)/2) {
- if (z > fClusters[m]->GetZ()) b=m+1;
- else e=m;
- }
- return m;
-}
-
//_________________________________________________________________________
-Int_t AliTOFpidESD::MakePID(AliESD *event)
+Int_t AliTOFpidESD::MakePID(AliESDEvent *event)
{
//
// This function calculates the "detector response" PID probabilities
// Just for a bare hint...
- static const Double_t masses[]={
- 0.000511, 0.105658, 0.139570, 0.493677, 0.938272, 1.875613
- };
-
Int_t ntrk=event->GetNumberOfTracks();
- Int_t nmatch=0;
- for (Int_t i=0; i<ntrk; i++) {
+ AliESDtrack **tracks=new AliESDtrack*[ntrk];
+
+ Int_t i;
+ for (i=0; i<ntrk; i++) {
AliESDtrack *t=event->GetTrack(i);
+ tracks[i]=t;
+ }
- if ((t->GetStatus()&AliESDtrack::kTRDout)==0) continue;
+ for (i=0; i<ntrk; i++) {
+ AliESDtrack *t=tracks[i];
+ if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
-
- Double_t x,par[5]; t->GetExternalParameters(x,par);
- Double_t cov[15]; t->GetExternalCovariance(cov);
-
- Double_t dphi2=3*3*(cov[0] + fDy*fDy/12.)/fR/fR;
- Double_t dz=3*TMath::Sqrt(cov[2] + fDz*fDz/12.);
-
- Double_t phi=TMath::ATan2(par[0],x) + t->GetAlpha();
- if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
- if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
- Double_t z=par[1];
-
- Double_t d2max=1000.;
- Int_t index=-1;
- for (Int_t k=FindClusterIndex(z-dz); k<fN; k++) {
- AliTOFcluster *c=fClusters[k];
-
- if (c->GetZ() > z+dz) break;
- if (c->IsUsed()) continue;
-
- Double_t dphi=TMath::Abs(c->GetPhi()-phi);
- if (dphi>TMath::Pi()) dphi-=TMath::Pi();
- if (dphi*dphi > dphi2) continue;
-
- Double_t d2=dphi*dphi*fR*fR + (c->GetZ()-z)*(c->GetZ()-z);
- if (d2 > d2max) continue;
-
- d2max=d2;
- index=k;
- }
-
- if (index<0) {
- //Info("MakePID","matching failed ! %d",TMath::Abs(t->GetLabel()));
- continue;
- }
-
- nmatch++;
-
- AliTOFcluster *c=fClusters[index];
-
+ Double_t tof=t->GetTOFsignal();
Double_t time[10]; t->GetIntegratedTimes(time);
- Double_t tof=50*c->GetTDC(); // in ps
-
Double_t p[10];
Double_t mom=t->GetP();
- for (Int_t j=0; j<AliESDtrack::kSPECIES; j++) {
- Double_t mass=masses[j];
- Double_t dp_p=0.03; //mean relative pt resolution;
- Double_t sigma=dp_p*time[j]/(1.+ mom*mom/(mass*mass));
+ Bool_t mismatch=kTRUE, heavy=kTRUE;
+ for (Int_t j=0; j<AliPID::kSPECIES; j++) {
+ Double_t mass=AliPID::ParticleMass(j);
+ Double_t dpp=0.01; //mean relative pt resolution;
+ if (mom>0.5) dpp=0.01*mom;
+ Double_t sigma=dpp*time[j]/(1.+ mom*mom/(mass*mass));
sigma=TMath::Sqrt(sigma*sigma + fSigma*fSigma);
if (TMath::Abs(tof-time[j]) > fRange*sigma) {
- p[j]=TMath::Exp(-0.5*fRange*fRange);
- continue;
- }
- p[j]=TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sigma*sigma));
+ p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
+ } else
+ p[j]=TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sigma*sigma))/sigma;
+
+ // Check the mismatching
+ Double_t pm=GetMismatchProbability(mom,mass);
+ if (p[j]>pm) mismatch=kFALSE;
+
+ // Check for particles heavier than (AliPID::kSPECIES - 1)
+ if (tof < (time[j] + fRange*sigma)) heavy=kFALSE;
+
}
- //if (c->GetLabel(0)!=TMath::Abs(t->GetLabel())) continue;
+ if (mismatch)
+ for (Int_t j=0; j<AliPID::kSPECIES; j++) p[j]=1/AliPID::kSPECIES;
- t->SetTOFsignal(tof);
- t->SetTOFcluster(index);
t->SetTOFpid(p);
- c->Use();
- }
+ if (heavy) t->ResetStatus(AliESDtrack::kTOFpid);
- Info("MakePID","Number of matched ESD track: %d",nmatch);
+ }
+ delete[] tracks;
+
return 0;
}
+
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff