//-------------------------------------------------------------------------
#include "AliKalmanTrack.h"
-#include "AliLog.h"
+#include "TGeoManager.h"
ClassImp(AliKalmanTrack)
-Double_t AliKalmanTrack::fgConvConst;
+const AliMagF *AliKalmanTrack::fgkFieldMap=0;
+Double_t AliKalmanTrack::fgConvConst=0.;
//_______________________________________________________________________
AliKalmanTrack::AliKalmanTrack():
fFakeRatio(0),
fChi2(0),
fMass(AliPID::ParticleMass(AliPID::kPion)),
- fN(0)
+ fN(0),
+ fLocalConvConst(0),
+ fStartTimeIntegral(kFALSE),
+ fIntegratedLength(0)
{
//
// Default constructor
//
- if (fgConvConst==0) {
+ if (fgkFieldMap==0) {
AliFatal("The magnetic field has not been set!");
}
-
- fStartTimeIntegral = kFALSE;
- fIntegratedLength = 0;
- for(Int_t i=0; i<5; i++) fIntegratedTime[i] = 0;
+
+ for(Int_t i=0; i<AliPID::kSPECIES; i++) fIntegratedTime[i] = 0;
}
//_______________________________________________________________________
fFakeRatio(t.fFakeRatio),
fChi2(t.fChi2),
fMass(t.fMass),
- fN(t.fN)
+ fN(t.fN),
+ fLocalConvConst(t.fLocalConvConst),
+ fStartTimeIntegral(t.fStartTimeIntegral),
+ fIntegratedLength(t.fIntegratedLength)
{
//
// Copy constructor
//
- if (fgConvConst==0) {
+ if (fgkFieldMap==0) {
AliFatal("The magnetic field has not been set!");
}
-
- fStartTimeIntegral = t.fStartTimeIntegral;
- fIntegratedLength = t.fIntegratedLength;
- for (Int_t i=0; i<5; i++)
- fIntegratedTime[i] = t.fIntegratedTime[i];
+ for (Int_t i=0; i<AliPID::kSPECIES; i++)
+ fIntegratedTime[i] = t.fIntegratedTime[i];
}
//_______________________________________________________________________
printf("\n");
}
-static void External2Helix(const AliKalmanTrack *t, Double_t helix[6]) {
+void AliKalmanTrack::External2Helix(Double_t helix[6]) const {
//--------------------------------------------------------------------
// External track parameters -> helix parameters
//--------------------------------------------------------------------
Double_t alpha,x,cs,sn;
- t->GetExternalParameters(x,helix); alpha=t->GetAlpha();
+ GetExternalParameters(x,helix); alpha=GetAlpha();
cs=TMath::Cos(alpha); sn=TMath::Sin(alpha);
helix[5]=x*cs - helix[0]*sn; // x0
//helix[1]= // z0
helix[2]=TMath::ASin(helix[2]) + alpha; // phi0
//helix[3]= // tgl
- helix[4]=helix[4]/t->GetConvConst(); // C
+ helix[4]=helix[4]/GetLocalConvConst(); // C
}
static void Evaluate(const Double_t *h, Double_t t,
//dx2=dy2=dz2=1.;
- Double_t p1[8]; External2Helix(this,p1);
+ Double_t p1[8]; External2Helix(p1);
p1[6]=TMath::Sin(p1[2]); p1[7]=TMath::Cos(p1[2]);
- Double_t p2[8]; External2Helix(p,p2);
+ Double_t p2[8]; p->External2Helix(p2);
p2[6]=TMath::Sin(p2[2]); p2[7]=TMath::Cos(p2[2]);
return dca;
}
+
+
+
+
+
+Double_t AliKalmanTrack::MeanMaterialBudget(Double_t *start, Double_t *end, Double_t *mparam)
+{
+ //
+ // calculate mean material budget and material properties beween point start and end
+ // mparam - returns parameters used for dEdx and multiple scatering
+ //
+ // mparam[0] - density mean
+ // mparam[1] - rad length
+ // mparam[2] - A mean
+ // mparam[3] - Z mean
+ // mparam[4] - length
+ // mparam[5] - Z/A mean
+ // mparam[6] - number of boundary crosses
+ //
+ mparam[0]=0; mparam[1]=1; mparam[2] =0; mparam[3] =0, mparam[4]=0, mparam[5]=0; mparam[6]=0;
+ //
+ Double_t bparam[6], lparam[6]; // bparam - total param - lparam - local parameters
+ for (Int_t i=0;i<6;i++) bparam[i]=0; //
+
+ if (!gGeoManager) {
+ printf("ERROR: no TGeo\n");
+ return 0.;
+ }
+ //
+ Double_t length;
+ Double_t dir[3];
+ length = TMath::Sqrt((end[0]-start[0])*(end[0]-start[0])+
+ (end[1]-start[1])*(end[1]-start[1])+
+ (end[2]-start[2])*(end[2]-start[2]));
+ mparam[4]=length;
+ if (length<TGeoShape::Tolerance()) return 0.0;
+ Double_t invlen = 1./length;
+ dir[0] = (end[0]-start[0])*invlen;
+ dir[1] = (end[1]-start[1])*invlen;
+ dir[2] = (end[2]-start[2])*invlen;
+ // Initialize start point and direction
+ TGeoNode *currentnode = 0;
+ TGeoNode *startnode = gGeoManager->InitTrack(start, dir);
+ // printf("%s length=%f\n",gGeoManager->GetPath(),length);
+ if (!startnode) {
+ printf("ERROR: start point out of geometry\n");
+ return 0.0;
+ }
+ TGeoMaterial *material = startnode->GetVolume()->GetMedium()->GetMaterial();
+ lparam[0] = material->GetDensity();
+ lparam[1] = material->GetRadLen();
+ lparam[2] = material->GetA();
+ lparam[3] = material->GetZ();
+ lparam[5] = lparam[3]/lparam[2];
+ if (material->IsMixture()) {
+ lparam[1]*=lparam[0]; // different normalization in the modeler for mixture
+ TGeoMixture * mixture = (TGeoMixture*)material;
+ lparam[5] =0;
+ Double_t sum =0;
+ for (Int_t iel=0;iel<mixture->GetNelements();iel++){
+ sum += mixture->GetWmixt()[iel];
+ lparam[5]+= mixture->GetZmixt()[iel]*mixture->GetWmixt()[iel]/mixture->GetAmixt()[iel];
+ }
+ lparam[5]/=sum;
+ }
+ gGeoManager->FindNextBoundary(length);
+ Double_t snext = gGeoManager->GetStep();
+ Double_t step = 0.0;
+ // If no boundary within proposed length, return current density
+ if (snext>=length) {
+ for (Int_t ip=0;ip<5;ip++) mparam[ip] = lparam[ip];
+ return lparam[0];
+ }
+ // Try to cross the boundary and see what is next
+ while (length>TGeoShape::Tolerance()) {
+ mparam[6]+=1.;
+ currentnode = gGeoManager->Step();
+ step += snext+1.E-6;
+ bparam[1] += snext*lparam[1];
+ bparam[2] += snext*lparam[2];
+ bparam[3] += snext*lparam[3];
+ bparam[5] += snext*lparam[5];
+ bparam[0] += snext*lparam[0];
+
+ if (snext>=length) break;
+ // printf("%s snext=%f density=%f bparam[0]=%f\n", gGeoManager->GetPath(),snext,density,bparam[0]);
+ if (!gGeoManager->IsEntering()) {
+ gGeoManager->SetStep(1.E-3);
+ currentnode = gGeoManager->Step();
+ if (!gGeoManager->IsEntering() || !currentnode) {
+ // printf("ERROR: cannot cross boundary\n");
+ mparam[0] = bparam[0]/step;
+ mparam[1] = bparam[1]/step;
+ mparam[2] = bparam[2]/step;
+ mparam[3] = bparam[3]/step;
+ mparam[5] = bparam[5]/step;
+ mparam[4] = step;
+ mparam[0] = 0.; // if crash of navigation take mean density 0
+ mparam[1] = 1000000; // and infinite rad length
+ return bparam[0]/step;
+ }
+ step += 1.E-3;
+ snext += 1.E-3;
+ bparam[0] += lparam[0]*1.E-3;
+ bparam[1] += lparam[1]*1.E-3;
+ bparam[2] += lparam[2]*1.E-3;
+ bparam[3] += lparam[3]*1.E-3;
+ bparam[5] += lparam[5]*1.E-3;
+ }
+ length -= snext;
+ material = currentnode->GetVolume()->GetMedium()->GetMaterial();
+ lparam[0] = material->GetDensity();
+ lparam[1] = material->GetRadLen();
+ lparam[2] = material->GetA();
+ lparam[3] = material->GetZ();
+ lparam[5] = lparam[3]/lparam[2];
+ if (material->IsMixture()) {
+ lparam[1]*=lparam[0];
+ TGeoMixture * mixture = (TGeoMixture*)material;
+ lparam[5]=0;
+ Double_t sum =0;
+ for (Int_t iel=0;iel<mixture->GetNelements();iel++){
+ sum+= mixture->GetWmixt()[iel];
+ lparam[5]+= mixture->GetZmixt()[iel]*mixture->GetWmixt()[iel]/mixture->GetAmixt()[iel];
+ }
+ lparam[5]/=sum;
+ }
+ gGeoManager->FindNextBoundary(length);
+ snext = gGeoManager->GetStep();
+ }
+ mparam[0] = bparam[0]/step;
+ mparam[1] = bparam[1]/step;
+ mparam[2] = bparam[2]/step;
+ mparam[3] = bparam[3]/step;
+ mparam[5] = bparam[5]/step;
+ return bparam[0]/step;
+
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff