--- /dev/null
+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * SigmaEffect_thetadegrees *
+ * 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 purpeateose. It is *
+ * provided "as is" without express or implied warranty. *
+ **************************************************************************/
+
+/* $Id$ */
+
+//===================================================================
+//This class was prepared by INFN Cagliari, July 2006
+//(authors: H.Woehri, A.de Falco)
+//
+// Compact information for the generated muon pairs in the MUON arm
+// useful at the last stage of the analysis chain
+// Pairs are built with two AliMUONTrackLight objects
+// Using the class AliMUONTrackLight this class combines the decay
+// information ("history") of the reconstructed tracks and fills
+// a series of flags for the formed reconstructed dimuon:
+// fIsCorrelated, fCreationProcess, fIsFeedDown, ...
+// for information about the dimuon, use PrintInfo with the appropriate
+// printflag
+// To be used together with AliMUONTrackLight
+//===================================================================
+
+
+//MUON classes
+#include "AliMUONPairLight.h"
+//Root classes
+#include "TString.h"
+
+ClassImp(AliMUONPairLight)
+
+//====================================
+AliMUONPairLight::AliMUONPairLight() :
+ TObject(),
+ fMu0(),
+ fMu1(),
+ fCreationProcess(-999),
+ fIsCorrelated(kFALSE),
+ fCauseOfCorrelation (-1),
+ fIsFeedDown(kFALSE)
+{
+ /// default constructor
+ ;
+}
+
+//====================================
+
+AliMUONPairLight::AliMUONPairLight(AliMUONPairLight &dimuCopy)
+ : TObject(dimuCopy),
+ fMu0(dimuCopy.fMu0),
+ fMu1(dimuCopy.fMu0),
+ fCreationProcess(dimuCopy.fCreationProcess),
+ fIsCorrelated(dimuCopy.fIsCorrelated),
+ fCauseOfCorrelation (dimuCopy.fCauseOfCorrelation),
+ fIsFeedDown(dimuCopy.fIsFeedDown)
+{
+/// copy constructor
+/// fMu0 = AliMUONTrackLight(dimuCopy.fMu0);
+/// fMu1 = AliMUONTrackLight(dimuCopy.fMu1);
+/// fIsCorrelated = dimuCopy.fIsCorrelated;
+/// fCauseOfCorrelation = dimuCopy.fCauseOfCorrelation;
+/// fCreationProcess = dimuCopy.fCreationProcess;
+/// fIsFeedDown = dimuCopy.fIsFeedDown;
+ ;
+}
+
+//====================================
+
+AliMUONPairLight::~AliMUONPairLight(){
+ /// destructor
+}
+
+//====================================
+
+Bool_t AliMUONPairLight::IsAResonance(){
+ /// checks if muon pair comes from a resonance decay
+ if (!fIsCorrelated) return kFALSE; //if muons not correlated, cannot be a resonance
+ //if muons are correlated, check if the PDG of the
+ //common mother is a resonance
+ Int_t pdg = GetCauseOfCorrelation();
+ if(pdg < 10) return kFALSE;
+ Int_t id=pdg%100000;
+ if(((id-id%10)%110)) return kFALSE;
+ else return kTRUE;
+ printf("<AliMUONPairLight::IsAResonance> arriving after this piece of code\n");
+
+}
+
+//====================================
+
+AliMUONTrackLight* AliMUONPairLight::GetMuon(Int_t index) {
+ /// return muon 0 or 1
+ if (index==0) return &fMu0;
+ else if (index==1) return &fMu1;
+ else{ printf ("Index can be either 0 or 1\n"); return 0;}
+ // else return &fMu1;
+}
+
+//====================================
+
+Int_t AliMUONPairLight::GetMuonMotherPDG(Int_t imuon, Int_t mother) {
+ /// return muon mother pdg code
+ if (imuon==0) return fMu0.GetParentPDGCode(mother);
+ else if (imuon==1) return fMu1.GetParentPDGCode(mother);
+ else { printf ("Index must be only 0 or 1\n"); return -999; }
+}
+
+//====================================
+void AliMUONPairLight::SetProcess(){
+ /// finds the process related to the muon pair (open charm/beauty, resonance,
+ /// uncorrelated...)
+ AliMUONTrackLight *mu1 = &fMu0;
+ AliMUONTrackLight *mu2 = &fMu1;
+
+ //1.) check if one of the tracks is not a muon
+ if(IsOneTrackNotAMuon()) {
+ this->SetCorrelated(kFALSE);
+ return;
+ }
+
+ // check if the two muons are correlated
+ // first check if they come from the same hadron (resonance or beauty/charm meson)
+ Int_t npar1 = mu1->GetNParents();
+ Int_t npar2 = mu2->GetNParents();
+ // for (Int_t imoth1 = 0; imoth1<npar1; imoth1++) {
+ for (Int_t imoth1 = npar1-1; imoth1>=0; imoth1--) {
+ Int_t lineMo1 = mu1->GetParentPythiaLine(imoth1);
+ // for (Int_t imoth2 = 0; imoth2<npar2; imoth2++) {
+ for (Int_t imoth2 = npar2-1; imoth2>=0; imoth2--) {
+ Int_t lineMo2 = mu2->GetParentPythiaLine(imoth2);
+ if(lineMo1 == lineMo2) {
+ this->SetCorrelated(kTRUE);
+ this->SetCauseOfCorrelation(mu1->GetParentPDGCode(imoth1));
+ if(!IsAResonance()) fCreationProcess = 3;
+ else fCreationProcess = -1;
+ return; // <<<<---------------- RETURN?
+ }
+ }
+ }
+
+ // if Open Beauty/Charm we can have 3 creation processes
+ // (pair creation [0], gluon splitting [1] or flavour excitation [2])
+ //
+ // 1.) gluon splitting: gluon (stored with index 2, id=21) must be the same
+ if (mu1->GetQuarkPythiaLine(2) == mu2->GetQuarkPythiaLine(2) && mu1->GetQuarkPDGCode(2) == 21) {
+ this->SetCorrelated(kTRUE);
+ if(GetCauseOfCorrelation() == -1){
+ this->SetCauseOfCorrelation(mu1->GetQuarkPDGCode(2));
+ }
+ fCreationProcess = 1;
+ return;
+ }
+
+ // 2.) pair creation: if pythia line 6 of one track *and* pythia line 7 of second track
+ // are filled with a Q and Qbar
+ Int_t line1 = mu1->GetQuarkPythiaLine(2); //[2] ... very first quark
+ Int_t line2 = mu2->GetQuarkPythiaLine(2);
+ Int_t flavour1 = TMath::Abs(mu1->GetQuarkPDGCode(2)); //[2] ... very first quark
+ Int_t flavour2 = TMath::Abs(mu2->GetQuarkPDGCode(2));
+ if ((line1 == 6 || line1 == 7) && (line2 == 6 || line2 == 7)) {
+ if((flavour1 == 4 || flavour1 == 5) && (flavour2 == 4 || flavour2 == 5)){
+ this->SetCorrelated(kTRUE);
+ fCreationProcess = 0;
+ return;
+ }
+ }
+
+ // 3.)flavour excitation:
+ if((((line1 == 6 || line1 == 7) && (flavour1 == 4 || flavour1 == 5)) && //first track has Q in line 6 or 7
+ ((line2 == 2 || line2 == 3) && (flavour2 == 21 || flavour2 < 10))) || //second track has a g/q in line 2 or 3
+ (((line2 == 6 || line2 == 7) && (flavour2 == 4 || flavour2 == 5)) && //or the same,
+ ((line1 == 2 || line1 == 3) && (flavour1 == 21 || flavour1 < 10)))){ // swapping the track's indices
+
+// printf("candidate for flavour excitation\n");
+
+ //Hermine: is it needed to check the lines 4-7???
+
+ //now, we have a candidate for flavour excitation
+ //we must also verify if in the Pythia listing
+ //the "incoming" lines 4 and 5 and "outgoing" lines 6 and 7
+ //are filled with g Q each: e.g. 4(g),5(Q),5(g),6(Q)
+// Int_t pdg4 = TMath::Abs(stack()->Particle(4)->GetPdgCode());
+// Int_t pdg5 = TMath::Abs(stack()->Particle(5)->GetPdgCode());
+// Int_t pdg6 = TMath::Abs(stack()->Particle(6)->GetPdgCode());
+// Int_t pdg7 = TMath::Abs(stack()->Particle(7)->GetPdgCode());
+// if((pdg4 == 21 && pdg5 < 10 || pdg5 == 21 && pdg4 < 10 ) &&
+// (pdg6 == 21 && pdg7 < 10 || pdg7 == 21 && pdg6 < 10 )){
+// this->PrintInfo("H");
+ this->SetCorrelated(kTRUE);
+ fCreationProcess = 2;
+ return;
+// }
+ }
+}
+
+//====================================
+void AliMUONPairLight::SetMuons(AliMUONTrackLight mu0, AliMUONTrackLight mu1){
+ /// set the two muons
+ fMu0 = mu0;
+ fMu1 = mu1;
+ this->SetProcess();
+}
+
+//====================================
+void AliMUONPairLight::PrintInfo(Option_t* opt){
+ /// print information about muon pairs
+ /// Options:
+ /// - "H" single muons' decay histories
+ /// - "K" dimuon kinematics
+ /// - "F" dimuon flags
+ /// - "A" all variables
+ TString options(opt);
+ options.ToUpper();
+
+ if(options.Contains("H") || options.Contains("A")){//muon decay histories
+
+ AliMUONTrackLight *mu1 = &fMu0;
+ AliMUONTrackLight *mu2 = &fMu1;
+
+ printf("========= History =======================\n");
+ printf("first muon");
+ mu1->PrintInfo("H");
+ printf("second muon");
+ mu2->PrintInfo("H");
+ printf("=========================================\n");
+ }
+ if(options.Contains("F") || options.Contains("A")){//flags
+ printf("the flags set for this muon pair are:\n");
+ printf("=====================================\n");
+ if(this->IsOneTrackNotAMuon()) printf("(*) one rec. track is not a muon\n");
+ fIsCorrelated ? printf("(*) it is a correlated pair\n") : printf("(*) it is not a correlated pair\n");
+ if(IsOpenCharm()) printf("(*) correlated open charm: ");
+ if(IsOpenBeauty()) printf("(*) correlated open beauty: ");
+ if(IsOpenCharm() || IsOpenBeauty()){
+ switch(fCreationProcess){
+ case 0:
+ printf("pair creation");
+ break;
+ case 1:
+ printf("gluon splitting");
+ break;
+ case 2:
+ printf("flavour excitation");
+ break;
+ case 3:
+ printf("both muons come from same fragmented mother");
+ break;
+ }
+ if(this->GetMuon(0)->GetOscillation() || this->GetMuon(1)->GetOscillation())
+ printf("... where oscillation occured\n");
+ else{
+ if(IsOpenBeauty())
+ printf(" (no oscillation)\n");
+ else
+ printf("\n");
+ }
+ }
+ IsAResonance() ? printf("(*) it is a resonance: %d\n", this->GetMuonMotherPDG(fIsFeedDown)) : printf("(*) it is not a resonance\n");
+ fIsFeedDown ? printf("(*) mother has feed-down: %d --> %d\n", this->GetMuonMotherPDG(1), this->GetMuonMotherPDG(0)) : printf("(*) no feed-down\n");
+ printf("=====================================\n");
+ }
+ if(options.Contains("K") || options.Contains("A")){//dimuon kinematics
+ Double_t *vtx = this->GetMuon(0)->GetVertex();
+ TLorentzVector momRec = this->GetPRec();
+ TLorentzVector momGen = this->GetPGen();
+ printf("the dimuon charge is %d\n", this->GetCharge());
+ printf("primary Vertex: Vx = %1.3f, Vy = %1.3f, Vz = %1.3f\n", vtx[0], vtx[1], vtx[2]);
+ printf("Generated: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momGen.Px(), momGen.Py(), momGen.Pz());
+ printf("Reconstructed: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momRec.Px(), momRec.Py(), momRec.Pz());
+ //rapidity, pT, angles, ...
+ printf("Rec. variables: pT %1.3f, pseudo-rapidity %1.3f, openingAngle %1.3f (%1.3f degree), theta %1.3f (%1.3f degree), phi %1.3f (%1.3f degree)\n",
+ momRec.Pt(), momRec.Eta(),
+ TMath::Pi()/180.*this->GetOpeningAngle(), this->GetOpeningAngle(),
+ momRec.Theta(), 180./TMath::Pi() * momRec.Theta(),
+ momRec.Phi(), 180./TMath::Pi() * momRec.Phi());
+ }
+}
+
+Double_t AliMUONPairLight::GetOpeningAngle() {
+ // opening angle between the two muons in the lab frame (in degrees)
+ TLorentzVector pRecMu0 = fMu0.GetPRec();
+ TLorentzVector pRecMu1 = fMu1.GetPRec();
+ TVector3 pRecMu03 = pRecMu0.Vect();
+ TVector3 pRecMu13 = pRecMu1.Vect();
+ Double_t scalar = pRecMu03.Dot(pRecMu13);
+ Double_t modMu0 = pRecMu03.Mag();
+ Double_t modMu1 = pRecMu13.Mag();
+ Double_t theta = (TMath::ACos(scalar/(modMu0*modMu1)))*(180./TMath::Pi());
+ return theta;
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff