#include "AliLog.h"
#include "AliMUONTrackParam.h"
#include "TParticle.h"
#include "AliMuonForwardTrack.h"
#include "AliMUONTrackExtrap.h"
#include "TClonesArray.h"
#include "TDatabasePDG.h"
#include "TLorentzVector.h"
#include "TRandom.h"
#include "AliMuonForwardTrackPair.h"
ClassImp(AliMuonForwardTrackPair)
AliMuonForwardTrackPair::AliMuonForwardTrackPair():
TObject(),
fMuonForwardTracks(0),
fKinemMC(0,0,0,0),
fKinem(0,0,0,0),
fIsKinemSet(kFALSE),
fXPointOfClosestApproach(9999),
fYPointOfClosestApproach(9999),
fZPointOfClosestApproach(9999)
{
fMuonForwardTracks = new TClonesArray("AliMuonForwardTrack", 2);
fMuonForwardTracks -> SetOwner(kTRUE);
}
AliMuonForwardTrackPair::AliMuonForwardTrackPair(AliMuonForwardTrack *track0, AliMuonForwardTrack *track1):
TObject(),
fMuonForwardTracks(0),
fKinemMC(0,0,0,0),
fKinem(0,0,0,0),
fIsKinemSet(kFALSE),
fXPointOfClosestApproach(9999),
fYPointOfClosestApproach(9999),
fZPointOfClosestApproach(9999)
{
fMuonForwardTracks = new TClonesArray("AliMuonForwardTrack", 2);
fMuonForwardTracks->SetOwner(kTRUE);
new ((*fMuonForwardTracks)[0]) AliMuonForwardTrack(*track0);
new ((*fMuonForwardTracks)[1]) AliMuonForwardTrack(*track1);
SetKinemMC();
SetPointOfClosestApproach();
}
AliMuonForwardTrackPair::AliMuonForwardTrackPair(const AliMuonForwardTrackPair& trackPair):
TObject(trackPair),
fMuonForwardTracks(NULL),
fKinemMC(trackPair.fKinemMC),
fKinem(trackPair.fKinem),
fIsKinemSet(trackPair.fIsKinemSet),
fXPointOfClosestApproach(trackPair.fXPointOfClosestApproach),
fYPointOfClosestApproach(trackPair.fYPointOfClosestApproach),
fZPointOfClosestApproach(trackPair.fZPointOfClosestApproach)
{
fMuonForwardTracks = new TClonesArray(*(trackPair.fMuonForwardTracks));
fMuonForwardTracks -> SetOwner(kTRUE);
}
AliMuonForwardTrackPair& AliMuonForwardTrackPair::operator=(const AliMuonForwardTrackPair& trackPair) {
if (this == &trackPair) return *this;
AliMuonForwardTrackPair::operator=(trackPair);
Clear("");
fMuonForwardTracks = new TClonesArray(*(trackPair.fMuonForwardTracks));
fMuonForwardTracks->SetOwner(kTRUE);
fKinemMC = trackPair.fKinemMC;
fKinem = trackPair.fKinem;
fIsKinemSet = trackPair.fIsKinemSet;
fXPointOfClosestApproach = trackPair.fXPointOfClosestApproach;
fYPointOfClosestApproach = trackPair.fYPointOfClosestApproach;
fZPointOfClosestApproach = trackPair.fZPointOfClosestApproach;
return *this;
}
Double_t AliMuonForwardTrackPair::GetWeightedOffset(Double_t x, Double_t y, Double_t z) {
Double_t weightedOffset[2]={0};
weightedOffset[0] = GetTrack(0)->GetWeightedOffset(x, y, z);
weightedOffset[1] = GetTrack(1)->GetWeightedOffset(x, y, z);
Double_t weightedOffsetDimuon = TMath::Sqrt(0.5 * (weightedOffset[0]*weightedOffset[0] + weightedOffset[1]*weightedOffset[1]));
return weightedOffsetDimuon;
}
Double_t AliMuonForwardTrackPair::GetWeightedOffsetAtPCA() {
return GetWeightedOffset(fXPointOfClosestApproach, fYPointOfClosestApproach, fZPointOfClosestApproach);
}
Double_t AliMuonForwardTrackPair::GetPCAQuality() {
Double_t wOffset_1 = GetTrack(0)->GetWeightedOffset(fXPointOfClosestApproach, fYPointOfClosestApproach, fZPointOfClosestApproach);
Double_t wOffset_2 = GetTrack(1)->GetWeightedOffset(fXPointOfClosestApproach, fYPointOfClosestApproach, fZPointOfClosestApproach);
Double_t f1 = TMath::Exp(-0.5 * wOffset_1);
Double_t f2 = TMath::Exp(-0.5 * wOffset_2);
if (f1+f2 > 0.) return (2.*f1*f2)/(f1+f2);
else return 0.;
}
Double_t AliMuonForwardTrackPair::GetMassWithoutMFT(Double_t x, Double_t y, Double_t z, Int_t nClusters) {
Int_t idCluster[2] = {0};
if (nClusters>0) {
idCluster[0] = GetTrack(0)->GetNMUONClusters() - nClusters;
idCluster[1] = GetTrack(1)->GetNMUONClusters() - nClusters;
}
if (idCluster[0]<0) idCluster[0] = 0;
if (idCluster[1]<0) idCluster[1] = 0;
AliMUONTrackParam *param0 = GetTrack(0)->GetTrackParamAtMUONCluster(idCluster[0]);
AliMUONTrackParam *param1 = GetTrack(1)->GetTrackParamAtMUONCluster(idCluster[1]);
AliDebug(2, Form("MUON before extrap: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
param0->Px(), param0->Py(), param0->Pz(), param1->Px(), param1->Py(), param1->Pz()));
AliDebug(2, Form("Extrapolating 1st muon from z = %f to z = %f", param0->GetZ(), z));
AliMUONTrackExtrap::ExtrapToVertex(param0, x, y, z, 0., 0.);
AliDebug(2, Form("Extrapolating 2nd muon from z = %f to z = %f", param1->GetZ(), z));
AliMUONTrackExtrap::ExtrapToVertex(param1, x, y, z, 0., 0.);
AliDebug(2, Form("MUON after extrap: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
param0->Px(), param0->Py(), param0->Pz(), param1->Px(), param1->Py(), param1->Pz()));
Double_t momentum[2] = {0};
momentum[0] = param0->P();
momentum[1] = param1->P();
Double_t mMu = TDatabasePDG::Instance()->GetParticle("mu-")->Mass();
TLorentzVector dimu;
dimu.SetE(TMath::Sqrt(mMu*mMu + momentum[0]*momentum[0]) + TMath::Sqrt(mMu*mMu + momentum[1]*momentum[1]));
dimu.SetPx(param0->Px() + param1->Px());
dimu.SetPy(param0->Py() + param1->Py());
dimu.SetPz(param0->Pz() + param1->Pz());
return dimu.M();
}
void AliMuonForwardTrackPair::SetKinemMC() {
if ( !(GetTrack(0)->GetMCTrackRef()) || !(GetTrack(1)->GetMCTrackRef()) ) return;
AliDebug(2, Form("MC: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
GetTrack(0)->GetMCTrackRef()->Px(), GetTrack(0)->GetMCTrackRef()->Py(), GetTrack(0)->GetMCTrackRef()->Pz(),
GetTrack(1)->GetMCTrackRef()->Px(), GetTrack(1)->GetMCTrackRef()->Py(), GetTrack(1)->GetMCTrackRef()->Pz()));
fKinemMC.SetE(GetTrack(0)->GetMCTrackRef()->Energy() + GetTrack(1)->GetMCTrackRef()->Energy());
fKinemMC.SetPx(GetTrack(0)->GetMCTrackRef()->Px() + GetTrack(1)->GetMCTrackRef()->Px());
fKinemMC.SetPy(GetTrack(0)->GetMCTrackRef()->Py() + GetTrack(1)->GetMCTrackRef()->Py());
fKinemMC.SetPz(GetTrack(0)->GetMCTrackRef()->Pz() + GetTrack(1)->GetMCTrackRef()->Pz());
}
void AliMuonForwardTrackPair::SetKinem(Double_t z, Int_t nClusters) {
Int_t idCluster[2] = {0};
if (nClusters>0) {
idCluster[0] = GetTrack(0)->GetNMFTClusters() - nClusters;
idCluster[1] = GetTrack(1)->GetNMFTClusters() - nClusters;
}
if (idCluster[0]<0) idCluster[0] = 0;
if (idCluster[1]<0) idCluster[1] = 0;
Double_t momentum[2] = {0};
AliMUONTrackParam *param0 = GetTrack(0)->GetTrackParamAtMFTCluster(idCluster[0]);
AliMUONTrackParam *param1 = GetTrack(1)->GetTrackParamAtMFTCluster(idCluster[1]);
AliDebug(2, Form("MFT before extrap: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
param0->Px(), param0->Py(), param0->Pz(), param1->Px(), param1->Py(), param1->Pz()));
if (TMath::Abs(z)<1e6) {
AliDebug(2, Form("Extrapolating 1st muon from z = %f to z = %f", param0->GetZ(), z));
AliMUONTrackExtrap::ExtrapToZCov(param0, z);
AliDebug(2, Form("Extrapolating 2nd muon from z = %f to z = %f", param1->GetZ(), z));
AliMUONTrackExtrap::ExtrapToZCov(param1, z);
}
AliDebug(2, Form("MFT after extrap: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
param0->Px(), param0->Py(), param0->Pz(), param1->Px(), param1->Py(), param1->Pz()));
momentum[0] = (param0->P());
momentum[1] = (param1->P());
Double_t mMu = TDatabasePDG::Instance()->GetParticle("mu-")->Mass();
fKinem.SetE(TMath::Sqrt(mMu*mMu + momentum[0]*momentum[0]) + TMath::Sqrt(mMu*mMu + momentum[1]*momentum[1]));
fKinem.SetPx(param0->Px() + param1->Px());
fKinem.SetPy(param0->Py() + param1->Py());
fKinem.SetPz(param0->Pz() + param1->Pz());
fIsKinemSet = kTRUE;
}
void AliMuonForwardTrackPair::SetPointOfClosestApproach() {
AliMUONTrackParam *param0 = GetTrack(0)->GetTrackParamAtMFTCluster(0);
AliMUONTrackParam *param1 = GetTrack(1)->GetTrackParamAtMFTCluster(0);
Double_t step = 1.;
Double_t startPoint = 0.;
Double_t r[3]={0}, z[3]={startPoint, startPoint+step, startPoint+2*step};
for (Int_t i=0; i<3; i++) {
AliMUONTrackExtrap::ExtrapToZCov(param0, z[i]);
AliMUONTrackExtrap::ExtrapToZCov(param1, z[i]);
Double_t dX = param0->GetNonBendingCoor() - param1->GetNonBendingCoor();
Double_t dY = param0->GetBendingCoor() - param1->GetBendingCoor();
r[i] = TMath::Sqrt(dX*dX + dY*dY);
}
Double_t researchDirection=0.;
if (r[0]>r[1] && r[1]>r[2]) researchDirection = +1.;
else if (r[0]<r[1] && r[1]<r[2]) researchDirection = -1.;
else if (r[0]<r[1] && r[1]>r[2]) {
AliError("Point of closest approach cannot be found for dimuon (no minima)");
return;
}
while (TMath::Abs(researchDirection)>0.5) {
if (researchDirection>0.) {
z[0] = z[1];
z[1] = z[2];
z[2] = z[1]+researchDirection*step;
}
else {
z[2] = z[1];
z[1] = z[0];
z[0] = z[1]+researchDirection*step;
}
if (TMath::Abs(z[0])>900.) {
AliError("Point of closest approach cannot be found for dimuon (no minima)");
return;
}
for (Int_t i=0; i<3; i++) {
AliMUONTrackExtrap::ExtrapToZCov(param0, z[i]);
AliMUONTrackExtrap::ExtrapToZCov(param1, z[i]);
Double_t dX = param0->GetNonBendingCoor() - param1->GetNonBendingCoor();
Double_t dY = param0->GetBendingCoor() - param1->GetBendingCoor();
r[i] = TMath::Sqrt(dX*dX + dY*dY);
}
researchDirection=0.;
if (r[0]>r[1] && r[1]>r[2]) researchDirection = +1.;
else if (r[0]<r[1] && r[1]<r[2]) researchDirection = -1.;
}
AliDebug(2,"Minimum region has been found");
step *= 0.5;
while (step>AliMFTConstants::fPrecisionPointOfClosestApproach) {
z[0] = z[1]-step;
z[2] = z[1]+step;
for (Int_t i=0; i<3; i++) {
AliMUONTrackExtrap::ExtrapToZCov(param0, z[i]);
AliMUONTrackExtrap::ExtrapToZCov(param1, z[i]);
Double_t dX = param0->GetNonBendingCoor() - param1->GetNonBendingCoor();
Double_t dY = param0->GetBendingCoor() - param1->GetBendingCoor();
r[i] = TMath::Sqrt(dX*dX + dY*dY);
}
if (r[0]<r[1]) z[1] = z[0];
else if (r[2]<r[1]) z[1] = z[2];
else step *= 0.5;
}
fZPointOfClosestApproach = z[1];
AliMUONTrackExtrap::ExtrapToZCov(param0, fZPointOfClosestApproach);
AliMUONTrackExtrap::ExtrapToZCov(param1, fZPointOfClosestApproach);
fXPointOfClosestApproach = 0.5*(param0->GetNonBendingCoor() + param1->GetNonBendingCoor());
fYPointOfClosestApproach = 0.5*(param0->GetBendingCoor() + param1->GetBendingCoor());
AliDebug(2,Form("Point of Closest Approach: (%f, %f, %f)",fXPointOfClosestApproach,fYPointOfClosestApproach,fZPointOfClosestApproach));
}
Bool_t AliMuonForwardTrackPair::IsResonance() {
Bool_t result = kFALSE;
Int_t labelMC[2] = {0};
Int_t codePDG[2] = {0};
for (Int_t iTrack=0; iTrack<2; iTrack++) {
labelMC[iTrack] = GetTrack(iTrack)->GetParentMCLabel(0);
codePDG[iTrack] = GetTrack(iTrack)->GetParentPDGCode(0);
}
AliDebug(1, Form("Muons' mothers: (%d, %d)", labelMC[0], labelMC[1]));
if (labelMC[0]==labelMC[1] && codePDG[0]==codePDG[1] && (codePDG[0]== 113 ||
codePDG[0]== 221 ||
codePDG[0]== 223 ||
codePDG[0]== 331 ||
codePDG[0]== 333 ||
codePDG[0]== 443 ||
codePDG[0]==100443 ||
codePDG[0]== 553 ||
codePDG[0]==100553 ) ) result = kTRUE;
if (result) AliDebug(1, Form("Pair is a resonance %d", codePDG[0]));
return result;
}
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