[u/mrichter/AliRoot.git] / STEER / AliAODRecoDecay.cxx

/**************************************************************************
 * Copyright(c) 1998-2006, 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.                  *
 **************************************************************************/

/////////////////////////////////////////////////////////////
//
// Base class for AOD reconstructed decay
//
// Author: A.Dainese, andrea.dainese@lnl.infn.it
/////////////////////////////////////////////////////////////

#include <TDatabasePDG.h>
#include <TVector3.h>
#include "AliVParticle.h"
#include "AliAODRecoDecay.h"

ClassImp(AliAODRecoDecay)

//--------------------------------------------------------------------------
AliAODRecoDecay::AliAODRecoDecay() :
  AliVParticle(),
  fSecondaryVtx(0x0),
  fCharge(0),
  fNProngs(0), fNDCA(0), fNPID(0),
  fPx(0x0), fPy(0x0), fPz(0x0),
  fd0(0x0),
  fDCA(0x0),
  fPID(0x0), 
  fEventNumber(-1),fRunNumber(-1)
{
  //
  // Default Constructor
  //
  fSecondaryVtx = new AliAODVertex();
}
//--------------------------------------------------------------------------
AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs,
				 Short_t charge,
				 Double_t *px,Double_t *py,Double_t *pz,
				 Double_t *d0) :
  AliVParticle(),
  fSecondaryVtx(vtx2),
  fCharge(charge),
  fNProngs(nprongs), fNDCA(0), fNPID(0),
  fPx(0x0), fPy(0x0), fPz(0x0),
  fd0(0x0),
  fDCA(0x0),
  fPID(0x0), 
  fEventNumber(-1),fRunNumber(-1)
{
  //
  // Constructor with AliAODVertex for decay vertex
  //

  fPx = new Double_t[GetNProngs()];
  fPy = new Double_t[GetNProngs()];
  fPz = new Double_t[GetNProngs()];
  fd0 = new Double_t[GetNProngs()];
  for(Int_t i=0; i<GetNProngs(); i++) {
    fPx[i] = px[i];
    fPy[i] = py[i];
    fPz[i] = pz[i];
    fd0[i] = d0[i];
  }
}
//--------------------------------------------------------------------------
AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs,
				 Short_t charge,
				 Double_t *d0) :
  AliVParticle(),
  fSecondaryVtx(vtx2),
  fCharge(charge),
  fNProngs(nprongs), fNDCA(0), fNPID(0),
  fPx(0x0), fPy(0x0), fPz(0x0),
  fd0(0x0),
  fDCA(0x0),
  fPID(0x0), 
  fEventNumber(-1),fRunNumber(-1)
{
  //
  // Constructor with AliAODVertex for decay vertex and without prongs momenta
  //

  fd0 = new Double_t[GetNProngs()];
  for(Int_t i=0; i<GetNProngs(); i++) fd0[i] = d0[i];
}
//--------------------------------------------------------------------------
AliAODRecoDecay::AliAODRecoDecay(const AliAODRecoDecay &source) :
  AliVParticle(source),
  fSecondaryVtx(source.fSecondaryVtx),
  fCharge(source.fCharge),
  fNProngs(source.fNProngs), fNDCA(source.fNDCA), fNPID(source.fNPID),
  fPx(0x0), fPy(0x0), fPz(0x0),
  fd0(0x0), 
  fDCA(0x0),
  fPID(0x0), 
  fEventNumber(source.fEventNumber),fRunNumber(source.fRunNumber)
{
  //
  // Copy constructor
  //
  if(source.GetNProngs()>0) {
    fd0 = new Double_t[GetNProngs()];
    memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double_t));
    if(source.fPx) {
      fPx = new Double_t[GetNProngs()];
      fPy = new Double_t[GetNProngs()];
      fPz = new Double_t[GetNProngs()];
      memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double_t));
      memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double_t));
      memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double_t));
    }
    if(source.fPID) {
      fPID = new Double_t[5*GetNProngs()];
      memcpy(fPID,source.fPID,GetNProngs()*sizeof(Double_t));
    }
    if(source.fDCA) {
      fDCA = new Float_t[GetNProngs()*(GetNProngs()-1)/2];
      memcpy(fDCA,source.fDCA,(GetNProngs()*(GetNProngs()-1)/2)*sizeof(Float_t));
    }
  }
}
//--------------------------------------------------------------------------
AliAODRecoDecay &AliAODRecoDecay::operator=(const AliAODRecoDecay &source)
{
  //
  // assignment operator
  //
  if(&source == this) return *this;
  fSecondaryVtx = source.fSecondaryVtx;
  fCharge = source.fCharge;
  fNProngs = source.fNProngs;
  fNDCA = source.fNDCA;
  fNPID = source.fNPID;
  fEventNumber = source.fEventNumber;
  fRunNumber = source.fRunNumber;
  if(source.GetNProngs()>0) {
    fd0 = new Double_t[GetNProngs()];
    memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double_t));
    if(source.fPx) {
      fPx = new Double_t[GetNProngs()];
      fPy = new Double_t[GetNProngs()];
      fPz = new Double_t[GetNProngs()];
      memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double_t));
      memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double_t));
      memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double_t));
    }
    if(source.fPID) {
      fPID = new Double_t[5*GetNProngs()];
      memcpy(fPID,source.fPID,GetNProngs()*sizeof(Double_t));
    }
    if(source.fDCA) {
      fDCA = new Float_t[GetNProngs()*(GetNProngs()-1)/2];
      memcpy(fDCA,source.fDCA,(GetNProngs()*(GetNProngs()-1)/2)*sizeof(Float_t));
    }
  }
  return *this;
}
//--------------------------------------------------------------------------
AliAODRecoDecay::~AliAODRecoDecay() {
  //  
  // Default Destructor
  //
  if(fSecondaryVtx) delete fSecondaryVtx;
  if(fPx) delete [] fPx;
  if(fPy) delete [] fPy;
  if(fPz) delete [] fPz;
  if(fd0) delete [] fd0;
  if(fPID) delete [] fPID;
  if(fDCA) delete [] fDCA;
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::Alpha() const 
{
  //
  // Armenteros-Podolanski alpha for 2-prong decays
  //
  if(GetNProngs()!=2) {
    printf("Can be called only for 2-prong decays");
    return (Double_t)-99999.;
  }
  return 1.-2./(1.+QlProng(0)/QlProng(1));
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::DecayLength(Double_t point[3]) const 
{
  //
  // Decay length assuming it is produced at "point" [cm]
  //
  return TMath::Sqrt((point[0]-GetSecVtxX())
		    *(point[0]-GetSecVtxX())
		    +(point[1]-GetSecVtxY())
		    *(point[1]-GetSecVtxY())
		    +(point[2]-GetSecVtxZ())
		    *(point[2]-GetSecVtxZ()));  
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::DecayLengthXY(Double_t point[3]) const 
{
  //
  // Decay length in XY assuming it is produced at "point" [cm]
  //
  return TMath::Sqrt((point[0]-GetSecVtxX())
		    *(point[0]-GetSecVtxX())
		    +(point[1]-GetSecVtxY())
		    *(point[1]-GetSecVtxY()));  
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::CosPointingAngle(Double_t point[3]) const 
{
  //
  // Cosine of pointing angle in space assuming it is produced at "point"
  //
  TVector3 mom(Px(),Py(),Pz());
  TVector3 fline(GetSecVtxX()-point[0],
		 GetSecVtxY()-point[1],
		 GetSecVtxZ()-point[2]);

  Double_t pta = mom.Angle(fline);

  return TMath::Cos(pta); 
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::CosPointingAngleXY(Double_t point[3]) const 
{
  //
  // Cosine of pointing angle in transverse plane assuming it is produced 
  // at "point"
  //
  TVector3 momXY(Px(),Py(),0.);
  TVector3 flineXY(GetSecVtxX()-point[0],
		   GetSecVtxY()-point[1],
		   0.);

  Double_t ptaXY = momXY.Angle(flineXY);

  return TMath::Cos(ptaXY); 
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::CosThetaStar(Int_t ip,UInt_t pdgvtx,UInt_t pdgprong0,UInt_t pdgprong1) const 
{
  //
  // Only for 2-prong decays: 
  // Cosine of decay angle (theta*) in the rest frame of the mother particle
  // for prong ip (0 or 1) with mass hypotheses pdgvtx for mother particle,
  // pdgprong0 for prong 0 and pdgprong1 for prong1
  //
  if(GetNProngs()!=2) {
    printf("Can be called only for 2-prong decays");
    return (Double_t)-99999.;
  }
  Double_t massvtx = TDatabasePDG::Instance()->GetParticle(pdgvtx)->Mass();
  Double_t massp[2];
  massp[0] = TDatabasePDG::Instance()->GetParticle(pdgprong0)->Mass();
  massp[1] = TDatabasePDG::Instance()->GetParticle(pdgprong1)->Mass();

  Double_t pStar = TMath::Sqrt(TMath::Power(massvtx*massvtx-massp[0]*massp[0]-massp[1]*massp[1],2.)-4.*massp[0]*massp[0]*massp[1]*massp[1])/(2.*massvtx);

  Double_t beta = P()/E(pdgvtx);
  Double_t gamma = E(pdgvtx)/massvtx;

  Double_t cts = (QlProng(ip)/gamma-beta*TMath::Sqrt(pStar*pStar+massp[ip]*massp[ip]))/pStar;

  return cts;
}
//---------------------------------------------------------------------------
Double_t AliAODRecoDecay::Ct(UInt_t pdg,Double_t point[3]) const
{
  //
  // Decay time * c assuming it is produced at "point" [cm]
  //
  Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
  return DecayLength(point)*mass/P();
}
//---------------------------------------------------------------------------
Double_t AliAODRecoDecay::E(UInt_t pdg) const 
{
  //
  // Energy
  //
  Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
  return TMath::Sqrt(mass*mass+P()*P());
}
//---------------------------------------------------------------------------
Double_t AliAODRecoDecay::EProng(Int_t ip,UInt_t pdg) const 
{
  //
  // Energy of ip-th prong 
  //
  Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
  return TMath::Sqrt(mass*mass+PProng(ip)*PProng(ip));
}
//---------------------------------------------------------------------------
/*Int_t AliAODRecoDecay::GetIndexProng(Int_t ip) const
{ 
  //
  // Index of prong ip
  //
  if(!GetNProngs()) return 999999;
  UShort_t *indices = fSecondaryVtx->GetIndices();
  return indices[ip];
}*/
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::ImpParXY(Double_t point[3]) const 
{
  //
  // Impact parameter in the bending plane of the particle 
  // w.r.t. to "point"
  //
  Double_t k = -(GetSecVtxX()-point[0])*Px()-(GetSecVtxY()-point[1])*Py();
  k /= Pt()*Pt();
  Double_t dx = GetSecVtxX()-point[0]+k*Px();
  Double_t dy = GetSecVtxY()-point[1]+k*Py();
  Double_t absImpPar = TMath::Sqrt(dx*dx+dy*dy);
  TVector3 mom(Px(),Py(),Pz());
  TVector3 fline(GetSecVtxX()-point[0],
		 GetSecVtxY()-point[1],
		 GetSecVtxZ()-point[2]);
  TVector3 cross = mom.Cross(fline);
  return (cross.Z()>0. ? absImpPar : -absImpPar);
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::InvMass(Int_t npdg,UInt_t *pdg) const 
{
  //
  // Invariant mass for prongs mass hypotheses in pdg array
  //
  if(GetNProngs()!=npdg) {
    printf("npdg != GetNProngs()");
    return (Double_t)-99999.;
  }
  Double_t energysum = 0.;

  for(Int_t i=0; i<GetNProngs(); i++) {
    energysum += EProng(i,pdg[i]);
  }

  Double_t mass = TMath::Sqrt(energysum*energysum-P()*P());

  return mass;
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::InvMass2Prongs(Int_t ip1,Int_t ip2,
				      UInt_t pdg1,UInt_t pdg2) const 
{
  //
  // 2-prong(ip1,ip2) invariant mass for prongs mass hypotheses in pdg1,2
  //
  Double_t energysum = EProng(ip1,pdg1) + EProng(ip2,pdg2);
  Double_t psum2 = (PxProng(ip1)+PxProng(ip2))*(PxProng(ip1)+PxProng(ip2))
                  +(PyProng(ip1)+PyProng(ip2))*(PyProng(ip1)+PyProng(ip2))
                  +(PzProng(ip1)+PzProng(ip2))*(PzProng(ip1)+PzProng(ip2));
  Double_t mass = TMath::Sqrt(energysum*energysum-psum2);

  return mass;
}
//---------------------------------------------------------------------------
void AliAODRecoDecay::Print(Option_t* /*option*/) const 
{
  //
  // Print some information
  //
  printf("AliAODRecoDecay with %d prongs\n",GetNProngs());
  printf("Secondary Vertex: (%f, %f, %f)\n",GetSecVtxX(),GetSecVtxY(),GetSecVtxZ());

  return;
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::ProngsRelAngle(Int_t ip1,Int_t ip2) const 
{
  //
  // Relative angle between two prongs
  //
  TVector3 momA(PxProng(ip1),PyProng(ip1),PzProng(ip1));
  TVector3 momB(PxProng(ip2),PyProng(ip2),PzProng(ip2));

  Double_t angle = momA.Angle(momB);

  return angle; 
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::QlProng(Int_t ip) const 
{
  //
  // Longitudinal momentum of prong w.r.t. to total momentum
  //
  TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
  TVector3 momTot(Px(),Py(),Pz());

  return mom.Dot(momTot)/momTot.Mag();
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::QtProng(Int_t ip) const 
{
  //
  // Transverse momentum of prong w.r.t. to total momentum  
  //
  TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
  TVector3 momTot(Px(),Py(),Pz());

  return mom.Perp(momTot);
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::QlProngFlightLine(Int_t ip,Double_t point[3]) const 
{
  //
  // Longitudinal momentum of prong w.r.t. to flight line between "point"
  // and fSecondaryVtx
  //
  TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
  TVector3 fline(GetSecVtxX()-point[0],
		 GetSecVtxY()-point[1],
		 GetSecVtxZ()-point[2]);

  return mom.Dot(fline)/fline.Mag();
}
//----------------------------------------------------------------------------
Double_t AliAODRecoDecay::QtProngFlightLine(Int_t ip,Double_t point[3]) const 
{
  //
  // Transverse momentum of prong w.r.t. to flight line between "point" and 
  // fSecondaryVtx 
  //
  TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
  TVector3 fline(GetSecVtxX()-point[0],
		 GetSecVtxY()-point[1],
		 GetSecVtxZ()-point[2]);

  return mom.Perp(fline);
}
//--------------------------------------------------------------------------
Commit	Line	Data
7de7497b	1	/**************************************************************************
	2	* Copyright(c) 1998-2006, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/////////////////////////////////////////////////////////////
	17	//
	18	// Base class for AOD reconstructed decay
	19	//
	20	// Author: A.Dainese, andrea.dainese@lnl.infn.it
	21	/////////////////////////////////////////////////////////////
	22
	23	#include <TDatabasePDG.h>
	24	#include <TVector3.h>
ff7c57dd	25	#include "AliVParticle.h"
7de7497b	26	#include "AliAODRecoDecay.h"
	27
	28	ClassImp(AliAODRecoDecay)
	29
	30	//--------------------------------------------------------------------------
	31	AliAODRecoDecay::AliAODRecoDecay() :
ff7c57dd	32	AliVParticle(),
7de7497b	33	fSecondaryVtx(0x0),
	34	fCharge(0),
	35	fNProngs(0), fNDCA(0), fNPID(0),
	36	fPx(0x0), fPy(0x0), fPz(0x0),
	37	fd0(0x0),
	38	fDCA(0x0),
	39	fPID(0x0),
	40	fEventNumber(-1),fRunNumber(-1)
	41	{
	42	//
	43	// Default Constructor
	44	//
	45	fSecondaryVtx = new AliAODVertex();
	46	}
	47	//--------------------------------------------------------------------------
	48	AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs,
	49	Short_t charge,
	50	Double_t px,Double_t py,Double_t *pz,
	51	Double_t *d0) :
ff7c57dd	52	AliVParticle(),
7de7497b	53	fSecondaryVtx(vtx2),
	54	fCharge(charge),
	55	fNProngs(nprongs), fNDCA(0), fNPID(0),
	56	fPx(0x0), fPy(0x0), fPz(0x0),
	57	fd0(0x0),
	58	fDCA(0x0),
	59	fPID(0x0),
	60	fEventNumber(-1),fRunNumber(-1)
	61	{
	62	//
	63	// Constructor with AliAODVertex for decay vertex
	64	//
	65
	66	fPx = new Double_t[GetNProngs()];
	67	fPy = new Double_t[GetNProngs()];
	68	fPz = new Double_t[GetNProngs()];
	69	fd0 = new Double_t[GetNProngs()];
	70	for(Int_t i=0; i<GetNProngs(); i++) {
	71	fPx[i] = px[i];
	72	fPy[i] = py[i];
	73	fPz[i] = pz[i];
	74	fd0[i] = d0[i];
	75	}
	76	}
	77	//--------------------------------------------------------------------------
	78	AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs,
	79	Short_t charge,
	80	Double_t *d0) :
ff7c57dd	81	AliVParticle(),
7de7497b	82	fSecondaryVtx(vtx2),
	83	fCharge(charge),
	84	fNProngs(nprongs), fNDCA(0), fNPID(0),
	85	fPx(0x0), fPy(0x0), fPz(0x0),
	86	fd0(0x0),
	87	fDCA(0x0),
	88	fPID(0x0),
	89	fEventNumber(-1),fRunNumber(-1)
	90	{
	91	//
	92	// Constructor with AliAODVertex for decay vertex and without prongs momenta
	93	//
	94
	95	fd0 = new Double_t[GetNProngs()];
	96	for(Int_t i=0; i<GetNProngs(); i++) fd0[i] = d0[i];
	97	}
	98	//--------------------------------------------------------------------------
	99	AliAODRecoDecay::AliAODRecoDecay(const AliAODRecoDecay &source) :
ff7c57dd	100	AliVParticle(source),
7de7497b	101	fSecondaryVtx(source.fSecondaryVtx),
	102	fCharge(source.fCharge),
	103	fNProngs(source.fNProngs), fNDCA(source.fNDCA), fNPID(source.fNPID),
	104	fPx(0x0), fPy(0x0), fPz(0x0),
	105	fd0(0x0),
	106	fDCA(0x0),
	107	fPID(0x0),
	108	fEventNumber(source.fEventNumber),fRunNumber(source.fRunNumber)
	109	{
	110	//
	111	// Copy constructor
	112	//
	113	if(source.GetNProngs()>0) {
	114	fd0 = new Double_t[GetNProngs()];
	115	memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double_t));
	116	if(source.fPx) {
	117	fPx = new Double_t[GetNProngs()];
	118	fPy = new Double_t[GetNProngs()];
	119	fPz = new Double_t[GetNProngs()];
	120	memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double_t));
	121	memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double_t));
	122	memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double_t));
	123	}
	124	if(source.fPID) {
	125	fPID = new Double_t[5*GetNProngs()];
	126	memcpy(fPID,source.fPID,GetNProngs()*sizeof(Double_t));
	127	}
	128	if(source.fDCA) {
	129	fDCA = new Float_t[GetNProngs()*(GetNProngs()-1)/2];
	130	memcpy(fDCA,source.fDCA,(GetNProngs()(GetNProngs()-1)/2)sizeof(Float_t));
	131	}
	132	}
	133	}
	134	//--------------------------------------------------------------------------
	135	AliAODRecoDecay &AliAODRecoDecay::operator=(const AliAODRecoDecay &source)
	136	{
	137	//
	138	// assignment operator
	139	//
	140	if(&source == this) return *this;
	141	fSecondaryVtx = source.fSecondaryVtx;
	142	fCharge = source.fCharge;
	143	fNProngs = source.fNProngs;
	144	fNDCA = source.fNDCA;
	145	fNPID = source.fNPID;
	146	fEventNumber = source.fEventNumber;
	147	fRunNumber = source.fRunNumber;
	148	if(source.GetNProngs()>0) {
	149	fd0 = new Double_t[GetNProngs()];
	150	memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double_t));
	151	if(source.fPx) {
	152	fPx = new Double_t[GetNProngs()];
	153	fPy = new Double_t[GetNProngs()];
	154	fPz = new Double_t[GetNProngs()];
	155	memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double_t));
	156	memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double_t));
	157	memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double_t));
	158	}
	159	if(source.fPID) {
	160	fPID = new Double_t[5*GetNProngs()];
	161	memcpy(fPID,source.fPID,GetNProngs()*sizeof(Double_t));
	162	}
	163	if(source.fDCA) {
	164	fDCA = new Float_t[GetNProngs()*(GetNProngs()-1)/2];
165	memcpy(fDCA,source.fDCA,(GetNProngs()(GetNProngs()-1)/2)sizeof(Float_t));
166	}
167	}
168	return *this;
169	}
170	//--------------------------------------------------------------------------
171	AliAODRecoDecay::~AliAODRecoDecay() {
172	//
173	// Default Destructor
174	//
175	if(fSecondaryVtx) delete fSecondaryVtx;
176	if(fPx) delete [] fPx;
177	if(fPy) delete [] fPy;
178	if(fPz) delete [] fPz;
179	if(fd0) delete [] fd0;
180	if(fPID) delete [] fPID;
181	if(fDCA) delete [] fDCA;
182	}
183	//----------------------------------------------------------------------------
184	Double_t AliAODRecoDecay::Alpha() const
185	{
186	//
187	// Armenteros-Podolanski alpha for 2-prong decays
188	//
189	if(GetNProngs()!=2) {
190	printf("Can be called only for 2-prong decays");
191	return (Double_t)-99999.;
192	}
193	return 1.-2./(1.+QlProng(0)/QlProng(1));
194	}
195	//----------------------------------------------------------------------------
196	Double_t AliAODRecoDecay::DecayLength(Double_t point[3]) const
197	{
198	//
199	// Decay length assuming it is produced at "point" [cm]
200	//
201	return TMath::Sqrt((point[0]-GetSecVtxX())
202	*(point[0]-GetSecVtxX())
203	+(point[1]-GetSecVtxY())
204	*(point[1]-GetSecVtxY())
205	+(point[2]-GetSecVtxZ())
206	*(point[2]-GetSecVtxZ()));
207	}
208	//----------------------------------------------------------------------------
209	Double_t AliAODRecoDecay::DecayLengthXY(Double_t point[3]) const
210	{
211	//
212	// Decay length in XY assuming it is produced at "point" [cm]
213	//
214	return TMath::Sqrt((point[0]-GetSecVtxX())
215	*(point[0]-GetSecVtxX())
216	+(point[1]-GetSecVtxY())
217	*(point[1]-GetSecVtxY()));
218	}
219	//----------------------------------------------------------------------------
220	Double_t AliAODRecoDecay::CosPointingAngle(Double_t point[3]) const
221	{
222	//
223	// Cosine of pointing angle in space assuming it is produced at "point"
224	//
225	TVector3 mom(Px(),Py(),Pz());
226	TVector3 fline(GetSecVtxX()-point[0],
227	GetSecVtxY()-point[1],
228	GetSecVtxZ()-point[2]);
229
230	Double_t pta = mom.Angle(fline);
231
232	return TMath::Cos(pta);
233	}
234	//----------------------------------------------------------------------------
235	Double_t AliAODRecoDecay::CosPointingAngleXY(Double_t point[3]) const
236	{
237	//
238	// Cosine of pointing angle in transverse plane assuming it is produced
239	// at "point"
240	//
241	TVector3 momXY(Px(),Py(),0.);
242	TVector3 flineXY(GetSecVtxX()-point[0],
243	GetSecVtxY()-point[1],
244	0.);
245
246	Double_t ptaXY = momXY.Angle(flineXY);
247
248	return TMath::Cos(ptaXY);
249	}
250	//----------------------------------------------------------------------------
251	Double_t AliAODRecoDecay::CosThetaStar(Int_t ip,UInt_t pdgvtx,UInt_t pdgprong0,UInt_t pdgprong1) const
252	{
253	//
254	// Only for 2-prong decays:
255	// Cosine of decay angle (theta*) in the rest frame of the mother particle
256	// for prong ip (0 or 1) with mass hypotheses pdgvtx for mother particle,
257	// pdgprong0 for prong 0 and pdgprong1 for prong1
258	//
259	if(GetNProngs()!=2) {
260	printf("Can be called only for 2-prong decays");
261	return (Double_t)-99999.;
262	}
263	Double_t massvtx = TDatabasePDG::Instance()->GetParticle(pdgvtx)->Mass();
264	Double_t massp[2];
265	massp[0] = TDatabasePDG::Instance()->GetParticle(pdgprong0)->Mass();
266	massp[1] = TDatabasePDG::Instance()->GetParticle(pdgprong1)->Mass();
267
268	Double_t pStar = TMath::Sqrt(TMath::Power(massvtxmassvtx-massp[0]massp[0]-massp[1]massp[1],2.)-4.massp[0]massp[0]massp[1]massp[1])/(2.massvtx);
269
270	Double_t beta = P()/E(pdgvtx);
271	Double_t gamma = E(pdgvtx)/massvtx;
272
273	Double_t cts = (QlProng(ip)/gamma-betaTMath::Sqrt(pStarpStar+massp[ip]*massp[ip]))/pStar;
274
275	return cts;
276	}
277	//---------------------------------------------------------------------------
278	Double_t AliAODRecoDecay::Ct(UInt_t pdg,Double_t point[3]) const
279	{
280	//
281	// Decay time * c assuming it is produced at "point" [cm]
282	//
283	Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
284	return DecayLength(point)*mass/P();
285	}
286	//---------------------------------------------------------------------------
287	Double_t AliAODRecoDecay::E(UInt_t pdg) const
288	{
289	//
290	// Energy
291	//
292	Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
293	return TMath::Sqrt(massmass+P()P());
294	}
295	//---------------------------------------------------------------------------
296	Double_t AliAODRecoDecay::EProng(Int_t ip,UInt_t pdg) const
297	{
298	//
299	// Energy of ip-th prong
300	//
301	Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
302	return TMath::Sqrt(massmass+PProng(ip)PProng(ip));
303	}
304	//---------------------------------------------------------------------------
305	/*Int_t AliAODRecoDecay::GetIndexProng(Int_t ip) const
306	{
307	//
308	// Index of prong ip
309	//
310	if(!GetNProngs()) return 999999;
311	UShort_t *indices = fSecondaryVtx->GetIndices();
312	return indices[ip];
313	}*/
314	//----------------------------------------------------------------------------
315	Double_t AliAODRecoDecay::ImpParXY(Double_t point[3]) const
316	{
317	//
318	// Impact parameter in the bending plane of the particle
319	// w.r.t. to "point"
320	//
321	Double_t k = -(GetSecVtxX()-point[0])Px()-(GetSecVtxY()-point[1])Py();
322	k /= Pt()*Pt();
323	Double_t dx = GetSecVtxX()-point[0]+k*Px();
324	Double_t dy = GetSecVtxY()-point[1]+k*Py();
325	Double_t absImpPar = TMath::Sqrt(dxdx+dydy);
326	TVector3 mom(Px(),Py(),Pz());
327	TVector3 fline(GetSecVtxX()-point[0],
328	GetSecVtxY()-point[1],
329	GetSecVtxZ()-point[2]);
330	TVector3 cross = mom.Cross(fline);
331	return (cross.Z()>0. ? absImpPar : -absImpPar);
332	}
333	//----------------------------------------------------------------------------
334	Double_t AliAODRecoDecay::InvMass(Int_t npdg,UInt_t *pdg) const
335	{
336	//
337	// Invariant mass for prongs mass hypotheses in pdg array
338	//
339	if(GetNProngs()!=npdg) {
340	printf("npdg != GetNProngs()");
341	return (Double_t)-99999.;
342	}
343	Double_t energysum = 0.;
344
345	for(Int_t i=0; i<GetNProngs(); i++) {
346	energysum += EProng(i,pdg[i]);
347	}
348
349	Double_t mass = TMath::Sqrt(energysumenergysum-P()P());
350
351	return mass;
352	}
353	//----------------------------------------------------------------------------
354	Double_t AliAODRecoDecay::InvMass2Prongs(Int_t ip1,Int_t ip2,
355	UInt_t pdg1,UInt_t pdg2) const
356	{
357	//
358	// 2-prong(ip1,ip2) invariant mass for prongs mass hypotheses in pdg1,2
359	//
360	Double_t energysum = EProng(ip1,pdg1) + EProng(ip2,pdg2);
361	Double_t psum2 = (PxProng(ip1)+PxProng(ip2))*(PxProng(ip1)+PxProng(ip2))
362	+(PyProng(ip1)+PyProng(ip2))*(PyProng(ip1)+PyProng(ip2))
363	+(PzProng(ip1)+PzProng(ip2))*(PzProng(ip1)+PzProng(ip2));
364	Double_t mass = TMath::Sqrt(energysum*energysum-psum2);
365
366	return mass;
367	}
368	//---------------------------------------------------------------------------
369	void AliAODRecoDecay::Print(Option_t* /option/) const
370	{
371	//
372	// Print some information
373	//
374	printf("AliAODRecoDecay with %d prongs\n",GetNProngs());
375	printf("Secondary Vertex: (%f, %f, %f)\n",GetSecVtxX(),GetSecVtxY(),GetSecVtxZ());
376
377	return;
378	}
379	//----------------------------------------------------------------------------
380	Double_t AliAODRecoDecay::ProngsRelAngle(Int_t ip1,Int_t ip2) const
381	{
382	//
383	// Relative angle between two prongs
384	//
385	TVector3 momA(PxProng(ip1),PyProng(ip1),PzProng(ip1));
386	TVector3 momB(PxProng(ip2),PyProng(ip2),PzProng(ip2));
387
388	Double_t angle = momA.Angle(momB);
389
390	return angle;
391	}
392	//----------------------------------------------------------------------------
393	Double_t AliAODRecoDecay::QlProng(Int_t ip) const
394	{
395	//
396	// Longitudinal momentum of prong w.r.t. to total momentum
397	//
398	TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
399	TVector3 momTot(Px(),Py(),Pz());
400
401	return mom.Dot(momTot)/momTot.Mag();
402	}
403	//----------------------------------------------------------------------------
404	Double_t AliAODRecoDecay::QtProng(Int_t ip) const
405	{
406	//
407	// Transverse momentum of prong w.r.t. to total momentum
408	//
409	TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
410	TVector3 momTot(Px(),Py(),Pz());
411
412	return mom.Perp(momTot);
413	}
414	//----------------------------------------------------------------------------
415	Double_t AliAODRecoDecay::QlProngFlightLine(Int_t ip,Double_t point[3]) const
416	{
417	//
418	// Longitudinal momentum of prong w.r.t. to flight line between "point"
419	// and fSecondaryVtx
420	//
421	TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
422	TVector3 fline(GetSecVtxX()-point[0],
423	GetSecVtxY()-point[1],
424	GetSecVtxZ()-point[2]);
425
426	return mom.Dot(fline)/fline.Mag();
427	}
428	//----------------------------------------------------------------------------
429	Double_t AliAODRecoDecay::QtProngFlightLine(Int_t ip,Double_t point[3]) const
430	{
431	//
432	// Transverse momentum of prong w.r.t. to flight line between "point" and
433	// fSecondaryVtx
434	//
435	TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
436	TVector3 fline(GetSecVtxX()-point[0],
437	GetSecVtxY()-point[1],
438	GetSecVtxZ()-point[2]);
439
440	return mom.Perp(fline);
441	}
442	//--------------------------------------------------------------------------