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[u/mrichter/AliRoot.git] / HBTAN / AliHBTPair.h
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1b446896 1#ifndef ALIHBTPAIR_H
2#define ALIHBTPAIR_H
3
4#include <TObject.h>
5
6
7#include "AliHBTParticle.h"
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
12class AliHBTPair: public TObject
13{
14 public:
15 AliHBTPair(Bool_t rev = kFALSE); //contructor
4ca0f301 16 virtual ~AliHBTPair(){}
1b446896 17 void SetParticles(AliHBTParticle*,AliHBTParticle*); //sets particles in the pair
18 AliHBTPair* GetSwapedPair() {return fSwapedPair;} //returns pair with swapped particles
19
20 AliHBTParticle* Particle1() const {return fPart1;} //returns pointer to first particle
21 AliHBTParticle* Particle2() const {return fPart2;} //returns pointer to decond particle
22
23 //Center Mass System - Longitudinally Comoving
24
25 Double_t GetInvMass(); //returns invariant mass of the pair
26
bf94f9a5 27
28 Double_t GetQInv(); //returns Q invariant
1b446896 29 Double_t GetQSideCMSLC(); //returns Q Side CMS longitudionally co-moving
30 Double_t GetQOutCMSLC(); //returns Q out CMS longitudionally co-moving
31 Double_t GetQLongCMSLC(); //returns Q Long CMS longitudionally co-moving
32
33
34 Double_t GetKt(); //returns K transverse
35 Double_t GetKStar();
36
7836ee94 37 Double_t GetDeltaP(); //return difference of momenta
38 Double_t GetDeltaPx();
39 Double_t GetDeltaPy();
40 Double_t GetDeltaPz();
1b446896 41
42 protected:
43 AliHBTParticle* fPart1; //pointer to first particle
44 AliHBTParticle* fPart2; //pointer to second particle
45
46 AliHBTPair* fSwapedPair; //pointer to swapped pair
47
48/************************************************************/
49/************CMS (LC) Q's *********************************/
50/************************************************************/
51 //Center Mass System - Longitudinally Comoving
52
53 Double_t fQSideCMSLC; //value of Q side CMS longitudially co-moving
54 Bool_t fQSideCMSLCNotCalc; //flag indicating if fQSideCMSLC is already calculated for this pair
55
56 Double_t fQOutCMSLC; //value of Q out CMS longitudially co-moving
57 Bool_t fQOutCMSLCNotCalc;//flag indicating if fQOutCMSLC is already calculated for this pair
58
59 Double_t fQLongCMSLC; //value of Q long CMS longitudially co-moving
60 Bool_t fQLongCMSLCNotCalc;//flag indicating if fQLongCMSLC is already calculated for this pair
61/************************************************************/
62/************************************************************/
63 Double_t fQInv; //half of differnece of 4-momenta
64 Bool_t fQInvNotCalc;//flag indicating if fQInv is already calculated for this pair
65
66 Double_t fInvMass; //invariant mass
67 Bool_t fInvMassNotCalc;//flag indicating if fInvMass is already calculated for this pair
68
69 Double_t fKt; //K == sum vector of particle's momenta. Kt transverse component
70 Bool_t fKtNotCalc;//flag indicating if fKt is already calculated for this pair
71
30025bb4 72 Double_t fKStar; //
1b446896 73 Bool_t fKStarNotCalc;
74
75 Double_t fPInv; //invariant momentum
76 Double_t fQSide; //Q Side
77 Double_t fOut;//Q Out
78 Double_t fQLong;//Q Long
79
80
81 Double_t fInvMassSqr;//squre of invariant mass
82 Bool_t fMassSqrNotCalc; //
83 void CalculateInvMassSqr();
84
85 Double_t fQInvL;
86 Bool_t fQInvLNotCalc;
87 void CalculateQInvL();
88
89 Double_t fPxSum;
90 Double_t fPySum;
91 Double_t fPzSum;
92 Double_t fESum;
93 Bool_t fSumsNotCalc;
94 void CalculateSums();
95
96 Double_t fPxDiff;
97 Double_t fPyDiff;
98 Double_t fPzDiff;
99 Double_t fEDiff;
100 Bool_t fDiffsNotCalc;
101 void CalculateDiffs();
102
103
104 /***************************************************/
105 void CalculateBase();
106 Bool_t fChanged;
107
108
109 private:
110 public:
111 ClassDef(AliHBTPair,1)
112};
113/****************************************************************/
114inline
115void AliHBTPair::SetParticles(AliHBTParticle* p1,AliHBTParticle* p2)
116{
117 //sets the particle to the pair
118
119 fPart1 = p1;
120 fPart2 = p2;
121 if (fSwapedPair) //if we have Swaped (so we are not)
122 fSwapedPair->SetParticles(p2,p1); //set particles for him too
123
124 // Resel all calculations (flags)
125
126 fChanged = kTRUE;
127 fSumsNotCalc = kTRUE;
128 fDiffsNotCalc = kTRUE;
129 fMassSqrNotCalc = kTRUE;
130 fInvMassNotCalc = kTRUE;
131 fQInvNotCalc = kTRUE;
132 fQSideCMSLCNotCalc = kTRUE;
133 fQOutCMSLCNotCalc = kTRUE;
134 fQLongCMSLCNotCalc = kTRUE;
135 fKtNotCalc = kTRUE;
136 fKStarNotCalc = kTRUE;
137 fQInvLNotCalc = kTRUE;
138
139 //and do nothing until will be asked for
140}
141/****************************************************************/
1b446896 142/****************************************************************/
143inline
144void AliHBTPair::CalculateInvMassSqr()
145 {
146 if (fMassSqrNotCalc)
147 {
148 CalculateSums();
149
150 Double_t fPart12s= (fPxSum*fPxSum) + (fPySum*fPySum) + (fPzSum*fPzSum);
151
152 fInvMassSqr=fESum*fESum-fPart12s;
153
154 fMassSqrNotCalc = kFALSE;
155 }
156 }
157/****************************************************************/
158inline
159void AliHBTPair::CalculateQInvL()
160 {
7836ee94 161 //Calculates square root of Qinv
1b446896 162 if (fQInvLNotCalc)
163 {
164 CalculateDiffs();
165 fQInvL = fEDiff*fEDiff - ( fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff );
166 fQInvLNotCalc = kFALSE;
167 }
168 }
169/****************************************************************/
170inline
171void AliHBTPair::CalculateSums()
172 {
173 if(fSumsNotCalc)
174 {
175 fPxSum = fPart1->Px()+fPart2->Px();
176 fPySum = fPart1->Py()+fPart2->Py();
177 fPzSum = fPart1->Pz()+fPart2->Pz();
178 fESum = fPart1->Energy() + fPart2->Energy();
179 fSumsNotCalc = kFALSE;
180 }
181 }
182/****************************************************************/
183inline
184void AliHBTPair::CalculateDiffs()
185 {
186 if(fDiffsNotCalc)
187 {
188 fPxDiff = fPart1->Px()-fPart2->Px();
189 fPyDiff = fPart1->Py()-fPart2->Py();
190 fPzDiff = fPart1->Pz()-fPart2->Pz();
191 fEDiff = fPart1->Energy() - fPart2->Energy();
192 fDiffsNotCalc = kFALSE;
193 }
194 }
195
7836ee94 196/****************************************************************/
197inline
198Double_t AliHBTPair::GetDeltaP() //return difference of momenta
199{
200 CalculateDiffs();
201 return TMath::Sqrt(fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff);
202}
203/****************************************************************/
204inline
205Double_t AliHBTPair::GetDeltaPx()
206 {
207 CalculateDiffs();
208 return fPxDiff;
209 }
210/****************************************************************/
211inline
212Double_t AliHBTPair::GetDeltaPy()
213 {
214 CalculateDiffs();
215 return fPyDiff;
216 }
217
218/****************************************************************/
219inline
220Double_t AliHBTPair::GetDeltaPz()
221 {
222 CalculateDiffs();
223 return fPzDiff;
224 }
225
226
1b446896 227#endif