1 #include "AliHBTPair.h"
2 #include "AliHBTParticle.h"
8 /************************************************************************/
9 AliHBTPair::AliHBTPair(Bool_t rev)
11 //value of rev defines if it is Swaped
12 //if you pass kTRUE swpaped pair will NOT be created
13 //though you wont be able to get the swaped pair from this pair
15 if(!rev) fSwapedPair = new AliHBTPair(kTRUE); //if false create swaped pair
16 else fSwapedPair = 0x0; //if true set the pointer to NULL
19 /************************************************************************/
20 Double_t AliHBTPair::GetInvMass()
24 CalculateInvMassSqr(); //method is inline so we not waste th time for jumping into method
26 if(fInvMassSqr<0) fInvMass = TMath::Sqrt(-fInvMassSqr);
27 else fInvMass = TMath::Sqrt(fInvMassSqr);
29 fInvMassNotCalc = kFALSE;
33 /************************************************************************/
34 Double_t AliHBTPair::GetQSideCMSLC()
36 //return Q Side in Central Of Mass System in Longitudialy Comoving Frame
38 if (fQSideCMSLCNotCalc)
40 fQSideCMSLC = (fPart1->Px()*fPart2->Py()-fPart2->Px()*fPart1->Py())/GetKt();
41 fQSideCMSLCNotCalc = kFALSE;
45 /************************************************************************/
46 Double_t AliHBTPair::GetQOutCMSLC()
52 Double_t k2 = fPxSum*fPxDiff+fPySum*fPyDiff;
53 fQOutCMSLC = 0.5*k2/GetKt();
54 fQOutCMSLCNotCalc = kFALSE;
58 /************************************************************************/
59 Double_t AliHBTPair::GetQLongCMSLC()
61 if (fQLongCMSLCNotCalc)
65 Double_t beta = fPzSum/fESum;
66 Double_t gamma = 1.0/TMath::Sqrt(1.0 - beta*beta);
67 fQLongCMSLC = gamma*( fPzDiff - beta*fEDiff );
68 fQLongCMSLCNotCalc = kFALSE;
72 /************************************************************************/
73 Double_t AliHBTPair::GetKt()
78 fKt = 0.5*TMath::Hypot(fPxSum,fPySum);
83 /************************************************************************/
85 Double_t AliHBTPair::GetKStar()
92 Double_t Ptrans = fPxSum*fPxSum + fPySum*fPySum;
93 Double_t Mtrans = fESum*fESum - fPzSum*fPzSum;
94 Double_t Pinv = TMath::Sqrt(Mtrans - Ptrans);
96 Double_t Q = ( fPart1->GetMass()*fPart1->GetMass() - fPart2->GetMass()*fPart2->GetMass())/Pinv;
100 Q = TMath::Sqrt( Q*Q - fQInvL);
102 fKStarNotCalc = kFALSE;
106 /************************************************************************/
108 Double_t AliHBTPair::GetQInv()
113 fQInv = TMath::Sqrt(TMath::Abs(fQInvL));
114 fQInvNotCalc = kFALSE;
119 /************************************************************************/
120 /************************************************************************/
122 /************************************************************************/