[u/mrichter/AliRoot.git] / ANALYSIS / AliAODPair.h

#ifndef AliAODPair_H
#define AliAODPair_H
//_________________________________________________________________________
///////////////////////////////////////////////////////////////////////////
//
// class AliAODPair
//
// class implements pair of particles and taking care of caluclation (almost)
// all of pair properties (Qinv, InvMass,...)
// more info: http://aliweb.cern.ch/people/skowron/analyzer/index.html
//
////////////////////////////////////////////////////////////////////////////

#include <TObject.h>
#include "AliVAODParticle.h"


class AliAODPair: public TObject
{
 public:
   AliAODPair(Bool_t rev = kFALSE); //contructor
   AliAODPair(AliVAODParticle* part1, AliVAODParticle* part2, Bool_t rev = kFALSE); //contructor
   AliAODPair(const AliAODPair& in);
   
   virtual ~AliAODPair(){}
   
   AliAODPair& operator=(const AliAODPair& in);
   
   void SetParticles(AliVAODParticle* p1,AliVAODParticle* p2); //sets particles in the pair
   AliAODPair* GetSwappedPair() {return fSwappedPair;} //returns pair with swapped particles
   
   AliVAODParticle* Particle1() const {return fPart1;} //returns pointer to first particle
   AliVAODParticle* Particle2() const {return fPart2;} //returns pointer to decond particle
   
   virtual void     Changed();
   //Center Mass System - Longitudinally Comoving
   
   virtual Double_t GetInvMass(); //returns invariant mass of the pair
   virtual Double_t GetMt();
   virtual Double_t GetQInv(); //returns Q invariant
   virtual Double_t GetQSideLCMS(); //returns Q Side CMS longitudionally co-moving
   virtual Double_t GetQOutLCMS(); //returns Q out CMS longitudionally co-moving
   virtual Double_t GetQLongLCMS(); //returns Q Long CMS longitudionally co-moving
   virtual Double_t GetQtLCMS(); //returns Q transverse CMS longitudionally co-moving
   
   virtual Double_t GetQt(); //returns Q transverse to Kt
   
   
   virtual Double_t GetKt();  //returns K transverse
   virtual Double_t GetKStar();
   virtual Double_t GetKStarOut();  //z.ch.
   virtual Double_t GetKStarSide(); //z.ch.
   virtual Double_t GetKStarLong(); //z.ch.
   

   virtual Double_t GetAvarageDistance();//returns avarage distnace between two tracks
   
   virtual Double_t GetDeltaE(); //return difference of Energies
   virtual Double_t GetDeltaP(); //return difference of momenta (scalar difference)
   virtual Double_t GetDeltaPvector(); //return legth of difference vector of momenta
   virtual Double_t GetDeltaPt();
   virtual Double_t GetDeltaPx();
   virtual Double_t GetDeltaPy();
   virtual Double_t GetDeltaPz();
   
   virtual Double_t GetDeltaTheta();
   virtual Double_t GetDeltaPhi();
   
   virtual Double_t GetGammaToLCMS();
   virtual Double_t GetGammaToTransverse();
   virtual Double_t GetPIDProb() const {return fPart1->GetPidProb()*fPart2->GetPidProb();}
   
   virtual Double_t GetRStar() ;
   virtual Double_t GetR() ;//returns distance between particle production points   
   
   void   MirrorSecond();
   void   DeleteSecond();
   
   void   Print(const Option_t* option ) const {TObject::Print(option);}
   void   Print() ;
   
 protected:
   AliVAODParticle* fPart1;  //pointer to first particle
   AliVAODParticle* fPart2;  //pointer to second particle
  
   AliAODPair* fSwappedPair; //pointer to swapped pair
   
/************************************************************/
/************CMS (LC) Q's   *********************************/
/************************************************************/
   //Center Mass System - Longitudinally Comoving
   
   Double_t fQSideLCMS;  //value of Q side CMS longitudially co-moving
   Bool_t   fQSideLCMSNotCalc; //flag indicating if fQSideLCMS is already calculated for this pair
   
   Double_t fQOutLCMS; //value of Q out CMS longitudially co-moving
   Bool_t   fQOutLCMSNotCalc;//flag indicating if fQOutLCMS is already calculated for this pair
   
   Double_t fQLongLCMS; //value of Q long CMS longitudially co-moving
   Bool_t   fQLongLCMSNotCalc;//flag indicating if fQLongLCMS is already calculated for this pair
   
   Double_t fQtLCMS; //value of Qt CMS longitudially co-moving (hypot(qsidelcms,qoutlcms))
   Bool_t   fQtLCMSNotCalc;//flag indicating if fQLongLCMS is already calculated for this pair

   Double_t fQt; //value of Qt, projection of 3-mom diff to Kt
   Bool_t   fQtNotCalc;//flag indicating if fQt is already calculated for this pair
   
/************************************************************/
/************************************************************/
   Double_t fQInv;  //half of differnece of 4-momenta
   Bool_t   fQInvNotCalc;//flag indicating if fQInv is already calculated for this pair
   
   Double_t fInvMass;  //invariant mass
   Bool_t   fInvMassNotCalc;//flag indicating if fInvMass is already calculated for this pair
   
   Double_t fKt; //K == sum vector of particle's momenta. Kt transverse component
   Bool_t   fKtNotCalc;//flag indicating if fKt is already calculated for this pair
   
   Double_t fKStar; // KStar
   Bool_t   fKStarNotCalc;// flag indicating if fKStar is calculated
   Double_t fKStarOut; // KStarOut   z.ch.
   Double_t fKStarSide;// KStarSide  z.ch.
   Double_t fKStarLong;// KStarLong  z.ch.

   Bool_t   fKStarCompNotCalc; // flag indicating if CalcuteKStarComp() is calculated  z.ch.

   Double_t fPInv;  //invariant momentum
   
   Double_t fQSide; //Q Side
   Double_t fOut;//Q Out
   Double_t fQLong;//Q Long

   Double_t fMt;//Transverse coordinate of Inv. Mass
   Bool_t   fMtNotCalc;//flag indicating if Mt is calculated for current pair
      
   Double_t fInvMassSqr;//squre of invariant mass
   Bool_t   fMassSqrNotCalc; //flag indicating if fInvMassSqr for this pair
   void     CalculateInvMassSqr();
   
   Double_t fQInvL; //Qinv in longitudional direction
   Bool_t   fQInvLNotCalc;//flag indicating if fQInvL is calculated for current pair
   void     CalculateQInvL();

   Double_t fAvarageDistance;//value of the avarage distance calculated out of track points
   Bool_t   fAvarageDistanceNotCalc;//flag indicating if the avarage distance is calculated
   
   Double_t fPxSum;// Sum of Px momenta
   Double_t fPySum;// Sum of Py momenta
   Double_t fPzSum;// Sum of Pz momenta
   Double_t fESum;// Sum of energies
   Bool_t   fSumsNotCalc;//flag indicating if fPxSum,fPxSum,fPxSum and fESum is calculated for current pair
   void     CalculateSums();
   void     CalculateKStarComp();
   
   Double_t fPxDiff;// Difference of Px momenta
   Double_t fPyDiff;// Difference of Px momenta
   Double_t fPzDiff;// Difference of Px momenta
   Double_t fEDiff;// Difference of Px momenta
   Bool_t   fDiffsNotCalc;//flag indicating if fPxDiff,fPxDiff,fPxDiff and fEDiff is calculated for current pair
   void     CalculateDiffs();
   
   Double_t fGammaLCMS;//gamma of boost in LCMS
   Bool_t   fGammaLCMSNotCalc;//flag indicating if fGammaLCMS is calculated for current pair
   /***************************************************/
   Bool_t   fChanged;//flag indicating if object has been changed

   void     CalculateBase();
   Double_t AvDistance();
   
   
 private:
  ClassDef(AliAODPair,1)
};
/****************************************************************/
inline
void AliAODPair::SetParticles(AliVAODParticle* p1,AliVAODParticle* p2)
{
 //sets the particle to the pair
 
 fPart1 = p1; 
 fPart2 = p2;
 if (fSwappedPair) //if we have Swapped (so we are not)
   fSwappedPair->SetParticles(fPart2,p1); //set particles for him too
 Changed();
 //and do nothing until will be asked for
} 
/****************************************************************/

inline
void AliAODPair::Changed()
{
 // Resel all calculations (flags)
 fChanged           = kTRUE;
 fSumsNotCalc       = kTRUE;
 fDiffsNotCalc      = kTRUE;
 fMassSqrNotCalc    = kTRUE;
 fInvMassNotCalc    = kTRUE;
 fQInvNotCalc       = kTRUE;
 fMtNotCalc         = kTRUE;
 fQSideLCMSNotCalc = kTRUE;
 fQOutLCMSNotCalc  = kTRUE;
 fQLongLCMSNotCalc = kTRUE;
 fQtLCMSNotCalc    = kTRUE;
 fQtNotCalc        = kTRUE;
 fKtNotCalc         = kTRUE;
 fKStarNotCalc      = kTRUE;
 fKStarCompNotCalc  = kTRUE;
 fQInvLNotCalc      = kTRUE;
 fGammaLCMSNotCalc = kTRUE;
 fAvarageDistanceNotCalc = kTRUE;
}
/****************************************************************/
inline 
void AliAODPair::CalculateInvMassSqr()
 {
  //calculates square of qinv
  if (fMassSqrNotCalc)
   {
     CalculateSums();
 
     Double_t fPart12s= (fPxSum*fPxSum) + (fPySum*fPySum) + (fPzSum*fPzSum);
 
     fInvMassSqr=fESum*fESum-fPart12s;

     fMassSqrNotCalc = kFALSE;
   }
 }
/****************************************************************/
inline 
void AliAODPair::CalculateQInvL()
 {
 //Calculates square root of Qinv
  if (fQInvLNotCalc)
  {
   CalculateDiffs();
   fQInvL = fEDiff*fEDiff - ( fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff );
   fQInvLNotCalc = kFALSE;
  }
 }
/****************************************************************/ 
inline 
void AliAODPair::CalculateSums()
 {
   //calculates momenta and energy sums
   if(fSumsNotCalc)
    {
     fPxSum = fPart1->Px()+fPart2->Px();
     fPySum = fPart1->Py()+fPart2->Py();
     fPzSum = fPart1->Pz()+fPart2->Pz();
     fESum  = fPart1->E() + fPart2->E();
     fSumsNotCalc = kFALSE;
    }
 }
/****************************************************************/
inline
void AliAODPair::CalculateKStarComp()
{
  
  if (fKStarCompNotCalc)
    {
      CalculateSums();

      Double_t ptrans = fPxSum*fPxSum + fPySum*fPySum;
      Double_t mtrans = fESum*fESum - fPzSum*fPzSum;
      Double_t pinv  =  TMath::Sqrt(mtrans - ptrans);
      ptrans         =  TMath::Sqrt(ptrans);
      mtrans         =  TMath::Sqrt(mtrans);
      
      Double_t px1   = fPart1->Px();
      Double_t py1   = fPart1->Py();
      Double_t pz1   = fPart1->Pz();
      Double_t pE1   = fPart1->E();

      // boost to LCMS
      Double_t beta  = fPzSum / fESum;
      Double_t gamma = fESum / mtrans;

      fKStarLong     = gamma * (pz1 - beta * pE1);
      double   temp  = gamma * (pE1 - beta * pz1);

      // rotate in transverse plane
      fKStarSide = (-px1*fPySum + py1*fPxSum)/ptrans;
      fKStarOut  = ( px1*fPxSum + py1*fPySum)/ptrans;
 
      // go from LCMS to CMS
      gamma = mtrans/pinv;
      beta  = ptrans/mtrans;
      fKStarOut  = gamma * (fKStarOut - beta * temp);

      fKStarCompNotCalc = kFALSE;
    }
}

/****************************************************************/
inline 
void AliAODPair::CalculateDiffs()
 {
   //calculates momenta and energy differences 
   if(fDiffsNotCalc)
    {
     fPxDiff = fPart1->Px()-fPart2->Px();
     fPyDiff = fPart1->Py()-fPart2->Py();
     fPzDiff = fPart1->Pz()-fPart2->Pz();
     fEDiff  = fPart1->E() - fPart2->E();
     fDiffsNotCalc = kFALSE;
    }
 }

/****************************************************************/

inline 
Double_t AliAODPair::GetDeltaE() 
{
 //returns difference of energies
  return fPart1->E() - fPart2->E();
}
/****************************************************************/

inline 
Double_t AliAODPair::GetDeltaP() 
{
 //returns difference of momenta (scalars)
 return fPart1->P() - fPart2->P();
}
/****************************************************************/

inline 
Double_t AliAODPair::GetDeltaPvector() //return difference of momenta
{
 //returns legth of the momenta difference vector 
 CalculateDiffs();
 return TMath::Sqrt(fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff);
}
/****************************************************************/

inline 
Double_t AliAODPair::GetDeltaPt()
 {
   //returns difference of Pz
   return fPart1->Pt()-fPart2->Pt();
 }
/****************************************************************/

inline 
Double_t AliAODPair::GetDeltaPx()
 {
   //returns difference of Pz
   CalculateDiffs();
   return fPxDiff;
 }
/****************************************************************/
inline 
Double_t AliAODPair::GetDeltaPy()
 {
   //returns difference of Py
   CalculateDiffs();
   return fPyDiff;
 }

/****************************************************************/
inline 
Double_t AliAODPair::GetDeltaPz()
 {
   //returns difference of Pz
   CalculateDiffs();
   return fPzDiff;
 }
/****************************************************************/

inline 
Double_t AliAODPair::GetDeltaPhi()
 {
   //returns difference of Phi
   Double_t phi1 = fPart1->Phi();
   Double_t phi2 = fPart2->Phi();
   Double_t diff = phi1-phi2;
   if (TMath::Abs(diff) > TMath::Pi())
    {
      if (phi1 > TMath::Pi())
       {
         phi1-=TMath::TwoPi();
       }
      else
       {
         phi2-=TMath::TwoPi();
       }
      diff = phi1-phi2; 
    }
   return diff;
 }
/****************************************************************/

inline 
Double_t AliAODPair::GetDeltaTheta()
 {
   //returns difference of Theta
   return fPart1->Theta()-fPart2->Theta();
 }
/****************************************************************/


#endif
Commit	Line	Data
78d7c6d3	1	#ifndef AliAODPair_H
	2	#define AliAODPair_H
	3	//_________________________________________________________________________
	4	///////////////////////////////////////////////////////////////////////////
	5	//
	6	// class AliAODPair
	7	//
	8	// class implements pair of particles and taking care of caluclation (almost)
	9	// all of pair properties (Qinv, InvMass,...)
c7ffd78f	10	// more info: http://aliweb.cern.ch/people/skowron/analyzer/index.html
78d7c6d3	11	//
	12	////////////////////////////////////////////////////////////////////////////
	13
	14	#include <TObject.h>
	15	#include "AliVAODParticle.h"
	16
	17
	18	class AliAODPair: public TObject
	19	{
	20	public:
	21	AliAODPair(Bool_t rev = kFALSE); //contructor
	22	AliAODPair(AliVAODParticle* part1, AliVAODParticle* part2, Bool_t rev = kFALSE); //contructor
	23	AliAODPair(const AliAODPair& in);
	24
	25	virtual ~AliAODPair(){}
	26
	27	AliAODPair& operator=(const AliAODPair& in);
	28
	29	void SetParticles(AliVAODParticle* p1,AliVAODParticle* p2); //sets particles in the pair
	30	AliAODPair* GetSwappedPair() {return fSwappedPair;} //returns pair with swapped particles
	31
	32	AliVAODParticle* Particle1() const {return fPart1;} //returns pointer to first particle
	33	AliVAODParticle* Particle2() const {return fPart2;} //returns pointer to decond particle
	34
	35	virtual void Changed();
	36	//Center Mass System - Longitudinally Comoving
	37
	38	virtual Double_t GetInvMass(); //returns invariant mass of the pair
	39	virtual Double_t GetMt();
	40	virtual Double_t GetQInv(); //returns Q invariant
	41	virtual Double_t GetQSideLCMS(); //returns Q Side CMS longitudionally co-moving
	42	virtual Double_t GetQOutLCMS(); //returns Q out CMS longitudionally co-moving
	43	virtual Double_t GetQLongLCMS(); //returns Q Long CMS longitudionally co-moving
f422a7da	44	virtual Double_t GetQtLCMS(); //returns Q transverse CMS longitudionally co-moving
f422a7da	45
fb629e2d	46	virtual Double_t GetQt(); //returns Q transverse to Kt
78d7c6d3	47
	48
	49	virtual Double_t GetKt(); //returns K transverse
	50	virtual Double_t GetKStar();
a40c0433	51	virtual Double_t GetKStarOut(); //z.ch.
	52	virtual Double_t GetKStarSide(); //z.ch.
	53	virtual Double_t GetKStarLong(); //z.ch.
78d7c6d3	54
a40c0433	55
78d7c6d3	56	virtual Double_t GetAvarageDistance();//returns avarage distnace between two tracks
78d7c6d3	57
b327f095	58	virtual Double_t GetDeltaE(); //return difference of Energies
	59	virtual Double_t GetDeltaP(); //return difference of momenta (scalar difference)
	60	virtual Double_t GetDeltaPvector(); //return legth of difference vector of momenta
78d7c6d3	61	virtual Double_t GetDeltaPt();
	62	virtual Double_t GetDeltaPx();
	63	virtual Double_t GetDeltaPy();
	64	virtual Double_t GetDeltaPz();
	65
	66	virtual Double_t GetDeltaTheta();
	67	virtual Double_t GetDeltaPhi();
	68
	69	virtual Double_t GetGammaToLCMS();
fe3f2f54	70	virtual Double_t GetGammaToTransverse();
78d7c6d3	71	virtual Double_t GetPIDProb() const {return fPart1->GetPidProb()*fPart2->GetPidProb();}
78d7c6d3	72
8ea30edc	73	virtual Double_t GetRStar() ;
	74	virtual Double_t GetR() ;//returns distance between particle production points
	75
af2872da	76	void MirrorSecond();
af2872da	77	void DeleteSecond();
fe3f2f54	78
201c7e13	79	void Print(const Option_t* option ) const {TObject::Print(option);}
201c7e13	80	void Print() ;
fe3f2f54	81
78d7c6d3	82	protected:
	83	AliVAODParticle* fPart1; //pointer to first particle
	84	AliVAODParticle* fPart2; //pointer to second particle
	85
	86	AliAODPair* fSwappedPair; //pointer to swapped pair
	87
	88	/************************************************************/
	89	/**********CMS (LC) Q's *******************************/
	90	/************************************************************/
	91	//Center Mass System - Longitudinally Comoving
	92
	93	Double_t fQSideLCMS; //value of Q side CMS longitudially co-moving
	94	Bool_t fQSideLCMSNotCalc; //flag indicating if fQSideLCMS is already calculated for this pair
	95
	96	Double_t fQOutLCMS; //value of Q out CMS longitudially co-moving
	97	Bool_t fQOutLCMSNotCalc;//flag indicating if fQOutLCMS is already calculated for this pair
	98
	99	Double_t fQLongLCMS; //value of Q long CMS longitudially co-moving
	100	Bool_t fQLongLCMSNotCalc;//flag indicating if fQLongLCMS is already calculated for this pair
f422a7da	101
fb629e2d	102	Double_t fQtLCMS; //value of Qt CMS longitudially co-moving (hypot(qsidelcms,qoutlcms))
f422a7da	103	Bool_t fQtLCMSNotCalc;//flag indicating if fQLongLCMS is already calculated for this pair
fb629e2d	104
	105	Double_t fQt; //value of Qt, projection of 3-mom diff to Kt
	106	Bool_t fQtNotCalc;//flag indicating if fQt is already calculated for this pair
	107
78d7c6d3	108	/************************************************************/
	109	/************************************************************/
	110	Double_t fQInv; //half of differnece of 4-momenta
	111	Bool_t fQInvNotCalc;//flag indicating if fQInv is already calculated for this pair
	112
	113	Double_t fInvMass; //invariant mass
	114	Bool_t fInvMassNotCalc;//flag indicating if fInvMass is already calculated for this pair
	115
	116	Double_t fKt; //K == sum vector of particle's momenta. Kt transverse component
	117	Bool_t fKtNotCalc;//flag indicating if fKt is already calculated for this pair
	118
	119	Double_t fKStar; // KStar
	120	Bool_t fKStarNotCalc;// flag indicating if fKStar is calculated
a40c0433	121	Double_t fKStarOut; // KStarOut z.ch.
	122	Double_t fKStarSide;// KStarSide z.ch.
	123	Double_t fKStarLong;// KStarLong z.ch.
	124
	125	Bool_t fKStarCompNotCalc; // flag indicating if CalcuteKStarComp() is calculated z.ch.
	126
78d7c6d3	127	Double_t fPInv; //invariant momentum
	128
	129	Double_t fQSide; //Q Side
	130	Double_t fOut;//Q Out
	131	Double_t fQLong;//Q Long
	132
	133	Double_t fMt;//Transverse coordinate of Inv. Mass
	134	Bool_t fMtNotCalc;//flag indicating if Mt is calculated for current pair
	135
	136	Double_t fInvMassSqr;//squre of invariant mass
	137	Bool_t fMassSqrNotCalc; //flag indicating if fInvMassSqr for this pair
	138	void CalculateInvMassSqr();
	139
	140	Double_t fQInvL; //Qinv in longitudional direction
	141	Bool_t fQInvLNotCalc;//flag indicating if fQInvL is calculated for current pair
	142	void CalculateQInvL();
	143
	144	Double_t fAvarageDistance;//value of the avarage distance calculated out of track points
	145	Bool_t fAvarageDistanceNotCalc;//flag indicating if the avarage distance is calculated
	146
	147	Double_t fPxSum;// Sum of Px momenta
	148	Double_t fPySum;// Sum of Py momenta
	149	Double_t fPzSum;// Sum of Pz momenta
	150	Double_t fESum;// Sum of energies
	151	Bool_t fSumsNotCalc;//flag indicating if fPxSum,fPxSum,fPxSum and fESum is calculated for current pair
	152	void CalculateSums();
a40c0433	153	void CalculateKStarComp();
78d7c6d3	154
	155	Double_t fPxDiff;// Difference of Px momenta
	156	Double_t fPyDiff;// Difference of Px momenta
	157	Double_t fPzDiff;// Difference of Px momenta
	158	Double_t fEDiff;// Difference of Px momenta
	159	Bool_t fDiffsNotCalc;//flag indicating if fPxDiff,fPxDiff,fPxDiff and fEDiff is calculated for current pair
	160	void CalculateDiffs();
	161
	162	Double_t fGammaLCMS;//gamma of boost in LCMS
	163	Bool_t fGammaLCMSNotCalc;//flag indicating if fGammaLCMS is calculated for current pair
	164	/***************************************************/
	165	Bool_t fChanged;//flag indicating if object has been changed
	166
	167	void CalculateBase();
	168	Double_t AvDistance();
	169
	170
	171	private:
	172	ClassDef(AliAODPair,1)
	173	};
	174	/****************************************************************/
	175	inline
	176	void AliAODPair::SetParticles(AliVAODParticle* p1,AliVAODParticle* p2)
	177	{
	178	//sets the particle to the pair
	179
af2872da	180	fPart1 = p1;
78d7c6d3	181	fPart2 = p2;
78d7c6d3	182	if (fSwappedPair) //if we have Swapped (so we are not)
af2872da	183	fSwappedPair->SetParticles(fPart2,p1); //set particles for him too
78d7c6d3	184	Changed();
	185	//and do nothing until will be asked for
	186	}
	187	/****************************************************************/
	188
	189	inline
	190	void AliAODPair::Changed()
	191	{
	192	// Resel all calculations (flags)
	193	fChanged = kTRUE;
	194	fSumsNotCalc = kTRUE;
	195	fDiffsNotCalc = kTRUE;
	196	fMassSqrNotCalc = kTRUE;
	197	fInvMassNotCalc = kTRUE;
	198	fQInvNotCalc = kTRUE;
	199	fMtNotCalc = kTRUE;
	200	fQSideLCMSNotCalc = kTRUE;
	201	fQOutLCMSNotCalc = kTRUE;
	202	fQLongLCMSNotCalc = kTRUE;
fb629e2d	203	fQtLCMSNotCalc = kTRUE;
fb629e2d	204	fQtNotCalc = kTRUE;
78d7c6d3	205	fKtNotCalc = kTRUE;
78d7c6d3	206	fKStarNotCalc = kTRUE;
a40c0433	207	fKStarCompNotCalc = kTRUE;
78d7c6d3	208	fQInvLNotCalc = kTRUE;
	209	fGammaLCMSNotCalc = kTRUE;
	210	fAvarageDistanceNotCalc = kTRUE;
	211	}
	212	/****************************************************************/
	213	inline
	214	void AliAODPair::CalculateInvMassSqr()
	215	{
	216	//calculates square of qinv
	217	if (fMassSqrNotCalc)
	218	{
	219	CalculateSums();
	220
	221	Double_t fPart12s= (fPxSumfPxSum) + (fPySumfPySum) + (fPzSum*fPzSum);
	222
	223	fInvMassSqr=fESum*fESum-fPart12s;
	224
	225	fMassSqrNotCalc = kFALSE;
	226	}
	227	}
	228	/****************************************************************/
	229	inline
	230	void AliAODPair::CalculateQInvL()
	231	{
	232	//Calculates square root of Qinv
	233	if (fQInvLNotCalc)
	234	{
	235	CalculateDiffs();
	236	fQInvL = fEDifffEDiff - ( fPxDifffPxDiff + fPyDifffPyDiff + fPzDifffPzDiff );
	237	fQInvLNotCalc = kFALSE;
	238	}
	239	}
	240	/****************************************************************/
	241	inline
	242	void AliAODPair::CalculateSums()
	243	{
	244	//calculates momenta and energy sums
	245	if(fSumsNotCalc)
	246	{
	247	fPxSum = fPart1->Px()+fPart2->Px();
	248	fPySum = fPart1->Py()+fPart2->Py();
	249	fPzSum = fPart1->Pz()+fPart2->Pz();
	250	fESum = fPart1->E() + fPart2->E();
	251	fSumsNotCalc = kFALSE;
	252	}
	253	}
a40c0433	254	/****************************************************************/
	255	inline
	256	void AliAODPair::CalculateKStarComp()
	257	{
	258
	259	if (fKStarCompNotCalc)
	260	{
	261	CalculateSums();
	262
	263	Double_t ptrans = fPxSumfPxSum + fPySumfPySum;
	264	Double_t mtrans = fESumfESum - fPzSumfPzSum;
	265	Double_t pinv = TMath::Sqrt(mtrans - ptrans);
	266	ptrans = TMath::Sqrt(ptrans);
	267	mtrans = TMath::Sqrt(mtrans);
	268
	269	Double_t px1 = fPart1->Px();
	270	Double_t py1 = fPart1->Py();
	271	Double_t pz1 = fPart1->Pz();
	272	Double_t pE1 = fPart1->E();
	273
	274	// boost to LCMS
	275	Double_t beta = fPzSum / fESum;
	276	Double_t gamma = fESum / mtrans;
	277
	278	fKStarLong = gamma * (pz1 - beta * pE1);
	279	double temp = gamma * (pE1 - beta * pz1);
	280
	281	// rotate in transverse plane
	282	fKStarSide = (-px1fPySum + py1fPxSum)/ptrans;
	283	fKStarOut = ( px1fPxSum + py1fPySum)/ptrans;
	284
	285	// go from LCMS to CMS
	286	gamma = mtrans/pinv;
	287	beta = ptrans/mtrans;
	288	fKStarOut = gamma * (fKStarOut - beta * temp);
	289
	290	fKStarCompNotCalc = kFALSE;
	291	}
	292	}
	293
78d7c6d3	294	/****************************************************************/
	295	inline
	296	void AliAODPair::CalculateDiffs()
	297	{
	298	//calculates momenta and energy differences
	299	if(fDiffsNotCalc)
	300	{
	301	fPxDiff = fPart1->Px()-fPart2->Px();
	302	fPyDiff = fPart1->Py()-fPart2->Py();
	303	fPzDiff = fPart1->Pz()-fPart2->Pz();
	304	fEDiff = fPart1->E() - fPart2->E();
	305	fDiffsNotCalc = kFALSE;
	306	}
	307	}
	308
	309	/****************************************************************/
b327f095	310
	311	inline
	312	Double_t AliAODPair::GetDeltaE()
	313	{
	314	//returns difference of energies
	315	return fPart1->E() - fPart2->E();
	316	}
	317	/****************************************************************/
	318
	319	inline
	320	Double_t AliAODPair::GetDeltaP()
	321	{
	322	//returns difference of momenta (scalars)
	323	return fPart1->P() - fPart2->P();
	324	}
	325	/****************************************************************/
	326
78d7c6d3	327	inline
b327f095	328	Double_t AliAODPair::GetDeltaPvector() //return difference of momenta
78d7c6d3	329	{
b327f095	330	//returns legth of the momenta difference vector
78d7c6d3	331	CalculateDiffs();
	332	return TMath::Sqrt(fPxDifffPxDiff + fPyDifffPyDiff + fPzDiff*fPzDiff);
	333	}
	334	/****************************************************************/
	335
	336	inline
	337	Double_t AliAODPair::GetDeltaPt()
	338	{
	339	//returns difference of Pz
	340	return fPart1->Pt()-fPart2->Pt();
	341	}
	342	/****************************************************************/
	343
	344	inline
	345	Double_t AliAODPair::GetDeltaPx()
	346	{
	347	//returns difference of Pz
	348	CalculateDiffs();
	349	return fPxDiff;
	350	}
	351	/****************************************************************/
	352	inline
	353	Double_t AliAODPair::GetDeltaPy()
	354	{
	355	//returns difference of Py
	356	CalculateDiffs();
	357	return fPyDiff;
	358	}
	359
	360	/****************************************************************/
	361	inline
	362	Double_t AliAODPair::GetDeltaPz()
	363	{
	364	//returns difference of Pz
	365	CalculateDiffs();
	366	return fPzDiff;
	367	}
	368	/****************************************************************/
	369
	370	inline
	371	Double_t AliAODPair::GetDeltaPhi()
	372	{
	373	//returns difference of Phi
	374	Double_t phi1 = fPart1->Phi();
	375	Double_t phi2 = fPart2->Phi();
	376	Double_t diff = phi1-phi2;
	377	if (TMath::Abs(diff) > TMath::Pi())
	378	{
	379	if (phi1 > TMath::Pi())
	380	{
	381	phi1-=TMath::TwoPi();
	382	}
	383	else
	384	{
	385	phi2-=TMath::TwoPi();
	386	}
	387	diff = phi1-phi2;
	388	}
	389	return diff;
	390	}
	391	/****************************************************************/
	392
	393	inline
	394	Double_t AliAODPair::GetDeltaTheta()
395	{
396	//returns difference of Theta
397	return fPart1->Theta()-fPart2->Theta();
398	}
399	/****************************************************************/
400
401
402	#endif