#include "AliLog.h"
#include "AliESD.h"
#include "AliESDtrack.h"
+#include "AliTracker.h"
#include "AliTRDpidESD.h"
#include "AliTRDgeometry.h"
#include "AliTRDtrack.h"
#include "Cal/AliTRDCalPIDLQ.h"
+
ClassImp(AliTRDpidESD)
Bool_t AliTRDpidESD::fCheckTrackStatus = kTRUE;
//_____________________________________________________________________________
AliTRDpidESD::AliTRDpidESD()
- :TObject()
+ :TObject(), fTrack(0x0)
{
//
// Default constructor
//_____________________________________________________________________________
AliTRDpidESD::AliTRDpidESD(const AliTRDpidESD &p)
- :TObject(p)
+ :TObject(p), fTrack(0x0)
{
//
// AliTRDpidESD copy constructor
}
+//_____________________________________________________________________________
+AliTRDpidESD::~AliTRDpidESD()
+{
+ //
+ // Destructor
+ //
+ if(fTrack) delete fTrack;
+}
+
//_____________________________________________________________________________
AliTRDpidESD &AliTRDpidESD::operator=(const AliTRDpidESD &p)
{
((AliTRDpidESD &) p).fCheckTrackStatus = fCheckTrackStatus;
((AliTRDpidESD &) p).fCheckKinkStatus = fCheckKinkStatus;
((AliTRDpidESD &) p).fMinPlane = fMinPlane;
-
+ ((AliTRDpidESD &) p).fTrack = 0x0;
+
}
//_____________________________________________________________________________
return -1;
}
-
// Loop through all ESD tracks
Double_t p[10];
AliESDtrack *t = 0x0;
- Double_t dedx[AliTRDtrack::kNslice], dEdx;
- Int_t timebin;
- Float_t mom, length, probTotal;
- Int_t nPlanePID;
+ Float_t dedx[AliTRDtrack::kNslice], dEdx;
+ Int_t timebin;
+ Float_t mom, length;
+ Int_t nPlanePID;
for (Int_t i=0; i<event->GetNumberOfTracks(); i++) {
t = event->GetTrack(i);
-
+
// Check track
if(!CheckTrack(t)) continue;
+
// Skip tracks which have no TRD signal at all
if (t->GetTRDsignal() == 0.) continue;
// Loop over detector layers
- mom = 0.; //t->GetP();
- length = 0.;
- probTotal = 0.;
+ mom = 0.;
+ length = 0.;
nPlanePID = 0;
- for (Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) p[iSpecies] = 1.;
+ for (Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) p[iSpecies] = 1./AliPID::kSPECIES;
for (Int_t iPlan = 0; iPlan < AliTRDgeometry::kNplan; iPlan++) {
// read data for track segment
for(int iSlice=0; iSlice<AliTRDtrack::kNslice; iSlice++)
if ((dEdx <= 0.) || (timebin <= -1.)) continue;
// retrive kinematic info for this track segment
- if(!GetTrackSegmentKine(t, iPlan, mom, length)) continue;
+ if(!RecalculateTrackSegmentKine(t, iPlan, mom, length)) continue;
// this track segment has fulfilled all requierments
nPlanePID++;
// Get the probabilities for the different particle species
for (Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) {
p[iSpecies] *= pd->GetProbability(iSpecies, mom, dedx, length);
- p[iSpecies] *= pd->GetProbabilityT(iSpecies, mom, timebin);
- probTotal += p[iSpecies];
+ //p[iSpecies] *= pd->GetProbabilityT(iSpecies, mom, timebin);
}
}
-
+ if(nPlanePID == 0) continue;
+
// normalize probabilities
- if(probTotal > 0.)
- for (Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++)
- if(nPlanePID > fMinPlane) p[iSpecies] /= probTotal;
- else p[iSpecies] = 1.0;
-
+ Double_t probTotal = 0.;
+ for (Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) probTotal += p[iSpecies];
+ if(probTotal <= 0.){
+ AliWarningGeneral("AliTRDpidESD::MakePID()",
+ Form("The total probability over all species <= 0 in ESD track %d. This may be caused by some error in reference data. Calculation continue but results might be corrupted.", i));
+ continue;
+ }
+ for(Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) p[iSpecies] /= probTotal;
// book PID to the track
t->SetTRDpid(p);
+ t->SetTRDpidQuality(nPlanePID);
}
return 0;
}
//_____________________________________________________________________________
-Bool_t AliTRDpidESD::GetTrackSegmentKine(AliESDtrack *t, Int_t plan, Float_t &mom, Float_t &length)
+Bool_t AliTRDpidESD::RecalculateTrackSegmentKine(AliESDtrack *esd, Int_t plan, Float_t &mom, Float_t &length)
{
//
// Retrive momentum "mom" and track "length" in TRD chamber from plane
// "plan" according to information stored in AliESDtrack "t".
- //
+ //
+ // Origin
+ // Alex Bercuci (A.Bercuci@gsi.de)
- if(!gAlice){
- AliErrorGeneral("AliTRDpidESD::GetTrackSegmentKine()"
- ,"No gAlice object to retrive TRDgeometry and Magnetic fied - this has to be removed in the future.");
- return kFALSE;
- }
-
- // Retrieve TRD geometry -> Maybe there is a better way to do this
- AliTRDgeometry trdGeom;
const Float_t kAmHalfWidth = AliTRDgeometry::AmThick() / 2.;
const Float_t kDrWidth = AliTRDgeometry::DrThick();
-
+ const Float_t kTime0 = AliTRDgeometry::GetTime0(plan);
- // retrive the magnetic field
- Double_t xyz0[3] = { 0., 0., 0.}, xyz1[3];
- Double_t b[3], alpha;
- gAlice->Field(xyz0,b); // b[] is in kilo Gauss
- Float_t field = b[2] * 0.1; // Tesla
+ // set initial length value to chamber height
+ length = 2 * kAmHalfWidth + kDrWidth;
- // find momentum at chamber entrance and track length in chamber
- AliExternalTrackParam *param = (plan<3) ? new AliExternalTrackParam(*t->GetInnerParam()) : new AliExternalTrackParam(*t->GetOuterParam());
-
- param->PropagateTo(trdGeom.GetTime0(plan)+kAmHalfWidth, field);
- param->GetXYZ(xyz0);
- alpha = param->GetAlpha();
- param->PropagateTo(trdGeom.GetTime0(plan)-kAmHalfWidth-kDrWidth, field);
- // eliminate track segments which are crossing SM boundaries along chamber
- if(TMath::Abs(alpha-param->GetAlpha())>.01){
- delete param;
+ // retrive track's outer param
+ const AliExternalTrackParam *op = esd->GetOuterParam();
+ if(!op){
+ mom = esd->GetP();
return kFALSE;
}
- param->GetXYZ(xyz1);
- length = sqrt(
- (xyz1[0]-xyz0[0])*(xyz1[0]-xyz0[0])+
- (xyz1[1]-xyz0[1])*(xyz1[1]-xyz0[1])+
- (xyz1[2]-xyz0[2])*(xyz1[2]-xyz0[2])
- );
- param->GetPxPyPz(xyz1);
- mom = sqrt(xyz1[0]*xyz1[0] + xyz1[1]*xyz1[1] + xyz1[2]*xyz1[2]);
- delete param;
+ AliExternalTrackParam *param = 0x0;
+ if(!fTrack){
+ fTrack = new AliExternalTrackParam(*op);
+ param = fTrack;
+ } else param = new(&fTrack) AliExternalTrackParam(*op);
+
+ // retrive the magnetic field
+ Double_t xyz0[3];
+ op->GetXYZ(xyz0);
+ Float_t field = AliTracker::GetBz(xyz0); // Bz in kG at point xyz0
+ // propagate to chamber entrance
+ if(!param->PropagateTo(kTime0-kAmHalfWidth-kDrWidth, field)){
+ mom = op->GetP();
+ return kFALSE;
+ }
+ mom = param->GetP();
+ Double_t s = param->GetSnp();
+ Double_t t = param->GetTgl();
+ length /= TMath::Sqrt((1. - s*s) / (1. - t*t));
+
+ // check if track is crossing tracking sector by propagating to chamber exit- maybe is too much :)
+ Double_t alpha = param->GetAlpha();
+ if(!param->PropagateTo(kTime0+kAmHalfWidth, field)) return kFALSE;
+
+ // mark track segments which are crossing SM boundaries along chamber
+ if(TMath::Abs(alpha-param->GetAlpha())>.01) return kFALSE;
+
return kTRUE;
}
class AliESD;
class AliESDtrack;
+class AliExternalTrackParam;
class AliTRDpidESD : public TObject {
public:
AliTRDpidESD();
AliTRDpidESD(const AliTRDpidESD &p);
- virtual ~AliTRDpidESD() {}
+ virtual ~AliTRDpidESD();
AliTRDpidESD &operator=(const AliTRDpidESD &p);
virtual void Copy(TObject &p) const;
static Bool_t CheckTrack(AliESDtrack *t);
- static Int_t MakePID(AliESD *event);
+ Int_t MakePID(AliESD *event);
void SetCheckTrackStatus(Bool_t status = kTRUE) { fCheckTrackStatus = status; };
void SetCheckKinkStatus(Bool_t status = kTRUE) { fCheckKinkStatus = status; };
Bool_t GetCheckTrackStatus() { return fCheckTrackStatus; };
Bool_t GetCheckKinkStatus() { return fCheckKinkStatus; };
Int_t GetMinPlane() { return fMinPlane; };
- static Bool_t GetTrackSegmentKine(AliESDtrack *t, Int_t plan, Float_t &mom, Float_t &length);
- private:
+
+private:
+ Bool_t RecalculateTrackSegmentKine(AliESDtrack *t, Int_t plan, Float_t &mom, Float_t &length);
+
+private:
static Bool_t fCheckTrackStatus; // Enable check on ESD track status
static Bool_t fCheckKinkStatus; // Enable check on ESD kink track
static Int_t fMinPlane; // Minimum number of planes
+ AliExternalTrackParam *fTrack; //! Memory holder for Track segment calculations
+
ClassDef(AliTRDpidESD,2) // TRD PID class
};
}
//_____________________________________________________________________________
-void AliTRDtrack::CookdEdx(Double_t low, Double_t up)
+void AliTRDtrack::CookdEdx(Double_t low, Double_t up)
{
//
// Calculates the truncated dE/dx within the "low" and "up" cuts.
//
- Int_t i = 0;
-
// Array to sort the dEdx values according to amplitude
Float_t sorted[kMAXCLUSTERSPERTRACK];
-
- // Number of clusters used for dedx
- Int_t nc = fNdedx;
-
+ fdEdx = 0.0;
+
// Require at least 10 clusters for a dedx measurement
- if (nc < 10) {
- SetdEdx(0);
- return;
- }
-
- // Lower and upper bound
- Int_t nl = Int_t(low * nc);
- Int_t nu = Int_t( up * nc);
+ if (fNdedx < 10) return;
// Can fdQdl be negative ????
- for (i = 0; i < nc; i++) {
+ for (Int_t i = 0; i < fNdedx; i++) {
sorted[i] = TMath::Abs(fdQdl[i]);
}
-
// Sort the dedx values by amplitude
- Int_t *index = new Int_t[nc];
- TMath::Sort(nc,sorted,index,kFALSE);
+ Int_t *index = new Int_t[fNdedx];
+ TMath::Sort(fNdedx, sorted, index, kFALSE);
- // Sum up the truncated charge between nl and nu
- Float_t dedx = 0.0;
- for (i = nl; i <= nu; i++) {
- dedx += sorted[index[i]];
+ // Sum up the truncated charge between lower and upper bounds
+ Int_t nl = Int_t(low * fNdedx);
+ Int_t nu = Int_t( up * fNdedx);
+ for (Int_t i = nl; i <= nu; i++) {
+ fdEdx += sorted[index[i]];
}
- dedx /= (nu - nl + 1.0);
- SetdEdx(dedx);
+ fdEdx /= (nu - nl + 1.0);
-}
+ delete[] index;
+
+}
//_____________________________________________________________________________
Bool_t AliTRDtrack::PropagateTo(Double_t xk, Double_t x0, Double_t rho)
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff