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