// which contains the result of the reconstruction
// and is the main set of classes for analaysis
// Origin: Christian Kuhn, IReS, Strasbourg, christian.kuhn@ires.in2p3.fr
+// Modified by: Antonin Maire,IPHC, Antonin.Maire@ires.in2p3.fr
+// and Boris Hippolyte,IPHC, hippolyt@in2p3.fr
//-------------------------------------------------------------------------
#include <TDatabasePDG.h>
#include <TMath.h>
+#include <TVector3.h>
-#include "AliLog.h"
-#include "AliExternalTrackParam.h"
-#include "AliESDv0.h"
#include "AliESDcascade.h"
+#include "AliLog.h"
ClassImp(AliESDcascade)
fBachMomCov[5]=1024;
}
-AliESDcascade::~AliESDcascade() {
+AliESDcascade::AliESDcascade(const AliESDcascade& cas) :
+ AliESDv0(cas),
+ fEffMassXi(cas.fEffMassXi),
+ fChi2Xi(cas.fChi2Xi),
+ fDcaXiDaughters(cas.fDcaXiDaughters),
+ fPdgCodeXi(cas.fPdgCodeXi),
+ fBachIdx(cas.fBachIdx)
+{
+ //--------------------------------------------------------------------
+ // The copy constructor
+ //--------------------------------------------------------------------
+ for (int i=0; i<3; i++) {
+ fPosXi[i] = cas.fPosXi[i];
+ fBachMom[i] = cas.fBachMom[i];
+ }
+ for (int i=0; i<6; i++) {
+ fPosCovXi[i] = cas.fPosCovXi[i];
+ fBachMomCov[i] = cas.fBachMomCov[i];
+ }
}
AliESDcascade::AliESDcascade(const AliESDv0 &v,
fPdgCodeXi(kXiMinus),
fBachIdx(i)
{
- //---------------------------------------------------------------------------------------------
+ //--------------------------------------------------------------------
// Main constructor (Xi-)
- //---------------------------------------------------------------------------------------------
+ //--------------------------------------------------------------------
Double_t r[3]; t.GetXYZ(r);
Double_t x1=r[0], y1=r[1], z1=r[2]; // position of the bachelor
Double_t ym=y2+a2*py2;
Double_t zm=z2+a2*pz2;
- //dca between V0 and bachelor
-
- fDcaXiDaughters = TMath::Sqrt((x1-xm)*(x1-xm) + (y1-ym)*(y1-ym) + (z1-zm)*(z1-zm));
-
// position of the cascade decay
fPosXi[0]=0.5*(x1+xm); fPosXi[1]=0.5*(y1+ym); fPosXi[2]=0.5*(z1+zm);
fBachMom[0]=px1; fBachMom[1]=py1; fBachMom[2]=pz1;
+ // Setting pdg code and fixing charge
+ if (t.Charge()<0)
+ fPdgCodeXi = kXiMinus;
+ else
+ fPdgCodeXi = kXiPlusBar;
+
//PH Covariance matrices: to be calculated correctly in the future
fPosCovXi[0]=1024;
fPosCovXi[1]=fPosCovXi[2]=0.;
fBachMomCov[4]=0.;
fBachMomCov[5]=1024;
- fChi2Xi=1024.;
+ fChi2Xi=1024.;
}
-AliESDcascade::AliESDcascade(const AliESDcascade& cas) :
- AliESDv0(cas),
- fPdgCodeXi(cas.fPdgCodeXi),
- fEffMassXi(cas.fEffMassXi),
- fChi2Xi(cas.fChi2Xi),
- fDcaXiDaughters(cas.fDcaXiDaughters),
- fBachIdx(cas.fBachIdx)
+AliESDcascade& AliESDcascade::operator=(const AliESDcascade& cas)
{
- //copy constructor
+ //--------------------------------------------------------------------
+ // The assignment operator
+ //--------------------------------------------------------------------
+
+ if(this==&cas) return *this;
+ AliESDv0::operator=(cas);
+
+ fEffMassXi = cas.fEffMassXi;
+ fChi2Xi = cas.fChi2Xi;
+ fDcaXiDaughters = cas.fDcaXiDaughters;
+ fPdgCodeXi = cas.fPdgCodeXi;
+ fBachIdx = cas.fBachIdx;
for (int i=0; i<3; i++) {
fPosXi[i] = cas.fPosXi[i];
- fBachMom[i] = cas.fBachMom[i];
+ fBachMom[i] = cas.fBachMom[i];
}
for (int i=0; i<6; i++) {
fPosCovXi[i] = cas.fPosCovXi[i];
fBachMomCov[i] = cas.fBachMomCov[i];
}
+ return *this;
}
+void AliESDcascade::Copy(TObject &obj) const {
+
+ // this overwrites the virtual TOBject::Copy()
+ // to allow run time copying without casting
+ // in AliESDEvent
+
+ if(this==&obj)return;
+ AliESDcascade *robj = dynamic_cast<AliESDcascade*>(&obj);
+ if(!robj)return; // not an AliESDcascade
+ *robj = *this;
+}
+
+AliESDcascade::~AliESDcascade() {
+ //--------------------------------------------------------------------
+ // Empty destructor
+ //--------------------------------------------------------------------
+}
+
+// Start with AliVParticle functions
+Double_t AliESDcascade::E() const {
+ //--------------------------------------------------------------------
+ // This gives the energy assuming the ChangeMassHypothesis was called
+ //--------------------------------------------------------------------
+ return E(fPdgCodeXi);
+}
+
+Double_t AliESDcascade::Y() const {
+ //--------------------------------------------------------------------
+ // This gives the energy assuming the ChangeMassHypothesis was called
+ //--------------------------------------------------------------------
+ return Y(fPdgCodeXi);
+}
+
+// Then extend AliVParticle functions
+Double_t AliESDcascade::E(Int_t pdg) const {
+ //--------------------------------------------------------------------
+ // This gives the energy with the particle hypothesis as argument
+ //--------------------------------------------------------------------
+ Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
+ return TMath::Sqrt(mass*mass+P()*P());
+}
+
+Double_t AliESDcascade::Y(Int_t pdg) const {
+ //--------------------------------------------------------------------
+ // This gives the rapidity with the particle hypothesis as argument
+ //--------------------------------------------------------------------
+ return 0.5*TMath::Log((E(pdg)+Pz())/(E(pdg)-Pz()+1.e-13));
+}
+
+// Now the functions for analysis consistency
+Double_t AliESDcascade::RapXi() const {
+ //--------------------------------------------------------------------
+ // This gives the pseudorapidity assuming a (Anti) Xi particle
+ //--------------------------------------------------------------------
+ return Y(kXiMinus);
+}
+
+Double_t AliESDcascade::RapOmega() const {
+ //--------------------------------------------------------------------
+ // This gives the pseudorapidity assuming a (Anti) Omega particle
+ //--------------------------------------------------------------------
+ return Y(kOmegaMinus);
+}
+
+Double_t AliESDcascade::AlphaXi() const {
+ //--------------------------------------------------------------------
+ // This gives the Armenteros-Podolanski alpha
+ //--------------------------------------------------------------------
+ TVector3 momBach(fBachMom[0],fBachMom[1],fBachMom[2]);
+ TVector3 momV0(fNmom[0]+fPmom[0],fNmom[1]+fPmom[1],fNmom[2]+fPmom[2]);
+ TVector3 momTot(Px(),Py(),Pz());
+
+ Double_t lQlBach = momBach.Dot(momTot)/momTot.Mag();
+ Double_t lQlV0 = momV0.Dot(momTot)/momTot.Mag();
+
+ return 1.-2./(1.+lQlBach/lQlV0);
+}
+
+Double_t AliESDcascade::PtArmXi() const {
+ //--------------------------------------------------------------------
+ // This gives the Armenteros-Podolanski ptarm
+ //--------------------------------------------------------------------
+ TVector3 momBach(fBachMom[0],fBachMom[1],fBachMom[2]);
+ TVector3 momTot(Px(),Py(),Pz());
+
+ return momBach.Perp(momTot);
+}
+
+// Then the older functions
Double_t AliESDcascade::ChangeMassHypothesis(Double_t &v0q, Int_t code) {
//--------------------------------------------------------------------
// This function changes the mass hypothesis for this cascade
Double_t nmass=0.13957, pmass=0.93827, ps0=0.101;
Double_t bmass=0.13957, mass =1.3213, ps =0.139;
- fPdgCodeXi=code;
+ if (Charge()*code<0)
+ fPdgCodeXi = code;
+ else {
+ AliWarning("Chosen PDG code does not match the sign of the bachelor... Corrected !!");
+ fPdgCodeXi = -code;
+ }
- switch (code) {
- case 213:
- bmass=0.93827;
- break;
+ switch (fPdgCodeXi) {
case kXiMinus:
break;
case kXiPlusBar:
bmass=0.49368; mass=1.67245; ps=0.211;
break;
default:
- AliError("Invalide PDG code ! Assuming XiMinus's...");
- fPdgCodeXi=kXiMinus;
+ AliError("Invalide PDG code ! Assuming a Xi particle...");
+ if (Charge()<0) {
+ fPdgCodeXi=kXiMinus;
+ }
+ else {
+ fPdgCodeXi=kXiPlusBar;
+ nmass=0.93827; pmass=0.13957;
+ }
break;
}
Double_t pxl=px0+pxb, pyl=py0+pyb, pzl=pz0+pzb;
Double_t pl=TMath::Sqrt(pxl*pxl + pyl*pyl + pzl*pzl);
- fEffMassXi=TMath::Sqrt((e0+eb)*(e0+eb) - pl*pl);
+ fEffMassXi=TMath::Sqrt(((e0+eb)-pl)*((e0+eb)+pl));
Double_t beta=pl/(e0+eb);
Double_t pl0=(px0*pxl + py0*pyl + pz0*pzl)/pl;
return d;
}
-Double_t AliESDcascade::GetCascadeCosineOfPointingAngle(Double_t& refPointX, Double_t& refPointY, Double_t& refPointZ) const {
+Double_t AliESDcascade::GetCascadeCosineOfPointingAngle(Double_t refPointX, Double_t refPointY, Double_t refPointZ) const {
// calculates the pointing angle of the cascade wrt a reference point
Double_t momCas[3]; //momentum of the cascade
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff