+/**************************************************************************
+ * 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. *
+ **************************************************************************/
+
+#include "AliESDtrack.h"
+#include "AliTracker.h"
+#include "AliHMPIDtrack.h"
+
+ClassImp(AliHMPIDtrack)
+
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+AliHMPIDtrack::AliHMPIDtrack():AliKalmanTrack()
+{
+ //
+ // def. ctor
+ //
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+AliHMPIDtrack::AliHMPIDtrack(const AliHMPIDtrack& t):AliKalmanTrack(t)
+{
+ //
+ // cctor.
+ //
+ }
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+AliHMPIDtrack::AliHMPIDtrack(const AliESDtrack& t):AliKalmanTrack()
+{
+ //
+ // Constructor from AliESDtrack
+ //
+ SetLabel(t.GetLabel());
+ SetChi2(0.);
+ SetMass(t.GetMass());
+
+ Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance());
+
+ if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
+ StartTimeIntegral();
+ Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
+ SetIntegratedLength(t.GetIntegratedLength());
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+AliHMPIDtrack& AliHMPIDtrack::operator=(const AliHMPIDtrack &/*source*/)
+{
+ // ass. op.
+
+ return *this;
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDtrack::PropagateTo(Double_t xk, Double_t xx0, Double_t xrho)
+{
+ //
+ // Propagates this track to a reference plane defined by "xk" [cm]
+ // correcting for the mean crossed material.
+ // Arguments:
+ // "xx0" - thickness/rad.length [units of the radiation length]
+ // "xrho" - thickness*density [g/cm^2]
+ // Returns: kTRUE if the track propagates to plane, else kFALSE
+
+ if (xk == GetX()) {
+ return kTRUE;
+ }
+ Double_t bz = GetBz();
+ if (!AliExternalTrackParam::PropagateTo(xk,bz)) {
+ return kFALSE;
+ }
+ if (!AliExternalTrackParam::CorrectForMeanMaterial(xx0,xrho,GetMass())) {
+ return kFALSE;
+ }
+ return kTRUE;
+}//PropagateTo()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDtrack::Rotate(Double_t alpha, Bool_t absolute)
+{
+ //
+ // Rotates track parameters in R*phi plane
+ // if absolute rotation alpha is in global system
+ // otherwise alpha rotation is relative to the current rotation angle
+ //
+
+ if (absolute) {
+ alpha -= GetAlpha();
+ }
+
+
+ return AliExternalTrackParam::Rotate(GetAlpha()+alpha);
+
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Int_t AliHMPIDtrack::GetProlongation(Double_t xk, Double_t &y, Double_t &z)
+{
+ //
+ // Find a prolongation at given x
+ // Return 0 if it does not exist
+ //
+
+ Double_t bz = GetBz();
+
+ if (!AliExternalTrackParam::GetYAt(xk,bz,y)) {
+ return 0;
+ }
+ if (!AliExternalTrackParam::GetZAt(xk,bz,z)) {
+ return 0;
+ }
+
+ return 1;
+
+}
+
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Int_t AliHMPIDtrack::PropagateToR(Double_t r,Double_t step)
+{
+ //
+ // Propagate track to the radial position
+ // Rotation always connected to the last track position
+ //
+
+ Double_t xyz0[3];
+ Double_t xyz1[3];
+ Double_t y;
+ Double_t z;
+
+ Double_t radius = TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
+ // Direction +-
+ Double_t dir = (radius > r) ? -1.0 : 1.0;
+
+ for (Double_t x = radius+dir*step; dir*x < dir*r; x += dir*step) {
+
+ GetXYZ(xyz0);
+ Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
+ Rotate(alpha,kTRUE);
+ GetXYZ(xyz0);
+ GetProlongation(x,y,z);
+ xyz1[0] = x * TMath::Cos(alpha) + y * TMath::Sin(alpha);
+ xyz1[1] = x * TMath::Sin(alpha) - y * TMath::Cos(alpha);
+ xyz1[2] = z;
+ Double_t param[7];
+ AliTracker::MeanMaterialBudget(xyz0,xyz1,param);
+ if (param[1] <= 0) {
+ param[1] = 100000000;
+ }
+ PropagateTo(x,param[1],param[0]*param[4]);
+
+ }
+
+ GetXYZ(xyz0);
+ Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
+ Rotate(alpha,kTRUE);
+ GetXYZ(xyz0);
+ GetProlongation(r,y,z);
+ xyz1[0] = r * TMath::Cos(alpha) + y * TMath::Sin(alpha);
+ xyz1[1] = r * TMath::Sin(alpha) - y * TMath::Cos(alpha);
+ xyz1[2] = z;
+ Double_t param[7];
+ AliTracker::MeanMaterialBudget(xyz0,xyz1,param);
+
+ if (param[1] <= 0) {
+ param[1] = 100000000;
+ }
+ PropagateTo(r,param[1],param[0]*param[4]);
+
+ return 0;
+
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Double_t AliHMPIDtrack::GetPredictedChi2(const AliCluster3D *c) const {
+ //
+ // Arguments: AliCluster3D
+ // Returns: Chi2 of track for the cluster
+ Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
+ Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
+ Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
+ return AliExternalTrackParam::GetPredictedChi2(p, covyz, covxyz);
+}//GetPredictedChi2()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDtrack::PropagateTo(const AliCluster3D *c) {
+ //
+ // Arguments: AliCluster3D
+ // Returns: kTRUE if the track propagates to the plane of the cluster
+ Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
+ Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
+ Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
+ Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
+ Double_t bz=GetBz();
+
+ if(!AliExternalTrackParam::PropagateTo(p, covyz, covxyz, bz)) return kFALSE;
+ if(IsStartedTimeIntegral())
+ {
+ Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) + (GetY()-oldY)*(GetY()-oldY) + (GetZ()-oldZ)*(GetZ()-oldZ));
+ if (GetX()<oldX) d=-d;
+ AddTimeStep(d);
+ }
+ return kTRUE;
+}//PropagateTo()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Double_t AliHMPIDtrack::GetBz() const {
+ //
+ // Arguments: none
+ // Returns: Bz component of the magnetic field (kG)
+ //
+ if (AliTracker::UniformField()) return AliTracker::GetBz();
+ Double_t r[3]; GetXYZ(r);
+ return AliTracker::GetBz(r);
+}//GetBz()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDtrack::Intersect(Double_t pnt[3], Double_t norm[3], Double_t bz) const {
+ //+++++++++++++++++++++++++++++++++++++++++
+ // Origin: K. Shileev (Kirill.Shileev@cern.ch)
+ // Finds point of intersection (if exists) of the helix with the plane.
+ // Stores result in fX and fP.
+ // Arguments: planePoint,planeNorm - the plane defined by any plane's point
+ // and vector, normal to the plane
+ // Returns: kTrue if helix intersects the plane, kFALSE otherwise.
+ //+++++++++++++++++++++++++++++++++++++++++
+ Double_t x0[3]; GetXYZ(x0); //get track position in MARS
+ //Printf("xxx Intersect OLD: bz: %lf xxx",bz);
+
+ //estimates initial helix length up to plane
+ Double_t s=(pnt[0]-x0[0])*norm[0] + (pnt[1]-x0[1])*norm[1] + (pnt[2]-x0[2])*norm[2];
+ Double_t dist=99999,distPrev=dist;
+ Double_t x[3],p[3];
+ while(TMath::Abs(dist)>0.00001){
+ //calculates helix at the distance s from x0 ALONG the helix
+ Propagate(s,x,p,bz);
+ //distance between current helix position and plane
+ dist=(x[0]-pnt[0])*norm[0]+(x[1]-pnt[1])*norm[1]+(x[2]-pnt[2])*norm[2];
+ if(TMath::Abs(dist) >= TMath::Abs(distPrev)) {return kFALSE;}
+ distPrev=dist;
+ s-=dist;
+ }
+ //on exit pnt is intersection point,norm is track vector at that point,
+ //all in MARS
+ for (Int_t i=0; i<3; i++) {pnt[i]=x[i]; norm[i]=p[i];}
+ return kTRUE;
+}//Intersect()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDtrack::Intersect(AliHMPIDtrack *pTrk,Double_t pnt[3], Double_t norm[3]) {
+ // Finds point of intersection (if exists) of the helix with the plane.
+ // Stores result in fX and fP.
+ // Arguments: planePoint,planeNorm - the plane defined by any plane's point
+ // and vector, normal to the plane
+ // Returns: kTrue if helix intersects the plane, kFALSE otherwise.
+
+ //Printf(":::::: 111 :::::: pnt0: %lf pnt1: %lf pnt2: %lf norm0: %lf norm1: %lf norm2: %lf",pnt[0],pnt[1],pnt[2],norm[0],norm[1],norm[2]);
+
+ Double_t bz=-1.0*GetBz();
+ Double_t x0[3]; pTrk->GetXYZ(x0); //get track position in MARS
+ //Printf(":::::: 222 :::::: x0: %lf x1: %lf x2: %lf",x0[0],x0[1],x0[2]);
+
+ Double_t rad;
+ //estimates initial helix length up to plane
+ Double_t s=(pnt[0]-x0[0])*norm[0] + (pnt[1]-x0[1])*norm[1] + (pnt[2]-x0[2])*norm[2];
+ Double_t dist=99999,distPrev=dist;
+ Double_t x[3],p[3];
+ while(TMath::Abs(dist)>0.00001){
+ //calculates helix at the distance s from x0 ALONG the helix
+ Propagate(s,x,p,bz);
+
+ //distance between current helix position and plane
+ dist=(x[0]-pnt[0])*norm[0]+(x[1]-pnt[1])*norm[1]+(x[2]-pnt[2])*norm[2];
+ if(TMath::Abs(dist) >= TMath::Abs(distPrev)) {return kFALSE;}
+ distPrev=dist;
+ s-=dist;
+ }
+ // Printf(":::::: 333 :::::: pnt0: %lf pnt1: %lf pnt2: %lf norm0: %lf norm1: %lf norm2: %lf",pnt[0],pnt[1],pnt[2],norm[0],norm[1],norm[2]);
+ //on exit pnt is intersection point,norm is track vector at that point,
+ //all in MARS
+ rad=TMath::Sqrt(x[0]*x[0]+x[1]*x[1]);
+ PropagateTo(rad); //propagate with the average dens. rad. lenght
+ GetXYZAt(rad,bz,x);
+ GetPxPyPz(p); //propagate to the radial distance of the PC or the Radiator
+ for (Int_t i=0; i<3; i++) {pnt[i]=x[i]; norm[i]=p[i];}
+ // Printf(":::::: 444 :::::: pnt0: %lf pnt1: %lf pnt2: %lf norm0: %lf norm1: %lf norm2: %lf",pnt[0],pnt[1],pnt[2],norm[0],norm[1],norm[2]);
+ /*
+ pEsdTrk->SetHMPIDpx(p[0]);
+ pEsdTrk->SetHMPIDpy(p[1]);
+ pEsdTrk->SetHMPIDpz(p[2]);
+ */
+
+ return kTRUE;
+}//Intersect()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+void AliHMPIDtrack::Propagate(Double_t len, Double_t x[3],Double_t p[3], Double_t bz) const {
+ //+++++++++++++++++++++++++++++++++++++++++
+ // Origin: K. Shileev (Kirill.Shileev@cern.ch)
+ // Extrapolate track along simple helix in magnetic field
+ // Arguments: len -distance alogn helix, [cm]
+ // bz - mag field, [kGaus]
+ // Returns: x and p contain extrapolated positon and momentum
+ // The momentum returned for straight-line tracks is meaningless !
+ //+++++++++++++++++++++++++++++++++++++++++
+ GetXYZ(x);
+ if (OneOverPt() < kAlmost0 || TMath::Abs(bz) < kAlmost0Field ){ //straight-line tracks
+ Double_t unit[3]; GetDirection(unit);
+ x[0]+=unit[0]*len;
+ x[1]+=unit[1]*len;
+ x[2]+=unit[2]*len;
+
+ p[0]=unit[0]/kAlmost0;
+ p[1]=unit[1]/kAlmost0;
+ p[2]=unit[2]/kAlmost0;
+ } else {
+ GetPxPyPz(p);
+ Double_t pp=GetP();
+ Double_t a = -kB2C*bz*GetSign(); ////////// what is kB2C
+ Double_t rho = a/pp;
+ x[0] += p[0]*TMath::Sin(rho*len)/a - p[1]*(1-TMath::Cos(rho*len))/a;
+ x[1] += p[1]*TMath::Sin(rho*len)/a + p[0]*(1-TMath::Cos(rho*len))/a;
+ x[2] += p[2]*len/pp;
+ Double_t p0=p[0];
+ p[0] = p0 *TMath::Cos(rho*len) - p[1]*TMath::Sin(rho*len);
+ p[1] = p[1]*TMath::Cos(rho*len) + p0 *TMath::Sin(rho*len);
+ }
+}//Propagate()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff