Bug correction: uninitialized fPartX
[u/mrichter/AliRoot.git] / HBTAN / AliHBTPair.h
CommitLineData
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
ec6e4013 16 AliHBTPair(AliHBTParticle* part1, AliHBTParticle* part2, Bool_t rev = kFALSE); //contructor
4ca0f301 17 virtual ~AliHBTPair(){}
1b446896 18 void SetParticles(AliHBTParticle*,AliHBTParticle*); //sets particles in the pair
19 AliHBTPair* GetSwapedPair() {return fSwapedPair;} //returns pair with swapped particles
20
21 AliHBTParticle* Particle1() const {return fPart1;} //returns pointer to first particle
22 AliHBTParticle* Particle2() const {return fPart2;} //returns pointer to decond particle
23
ec6e4013 24 void Changed();
1b446896 25 //Center Mass System - Longitudinally Comoving
26
27 Double_t GetInvMass(); //returns invariant mass of the pair
ec6e4013 28
29
bf94f9a5 30 Double_t GetQInv(); //returns Q invariant
1b446896 31 Double_t GetQSideCMSLC(); //returns Q Side CMS longitudionally co-moving
32 Double_t GetQOutCMSLC(); //returns Q out CMS longitudionally co-moving
33 Double_t GetQLongCMSLC(); //returns Q Long CMS longitudionally co-moving
34
35
36 Double_t GetKt(); //returns K transverse
37 Double_t GetKStar();
38
7836ee94 39 Double_t GetDeltaP(); //return difference of momenta
40 Double_t GetDeltaPx();
41 Double_t GetDeltaPy();
42 Double_t GetDeltaPz();
1b446896 43
44 protected:
45 AliHBTParticle* fPart1; //pointer to first particle
46 AliHBTParticle* fPart2; //pointer to second particle
47
48 AliHBTPair* fSwapedPair; //pointer to swapped pair
49
50/************************************************************/
51/************CMS (LC) Q's *********************************/
52/************************************************************/
53 //Center Mass System - Longitudinally Comoving
54
55 Double_t fQSideCMSLC; //value of Q side CMS longitudially co-moving
56 Bool_t fQSideCMSLCNotCalc; //flag indicating if fQSideCMSLC is already calculated for this pair
57
58 Double_t fQOutCMSLC; //value of Q out CMS longitudially co-moving
59 Bool_t fQOutCMSLCNotCalc;//flag indicating if fQOutCMSLC is already calculated for this pair
60
61 Double_t fQLongCMSLC; //value of Q long CMS longitudially co-moving
62 Bool_t fQLongCMSLCNotCalc;//flag indicating if fQLongCMSLC is already calculated for this pair
63/************************************************************/
64/************************************************************/
65 Double_t fQInv; //half of differnece of 4-momenta
66 Bool_t fQInvNotCalc;//flag indicating if fQInv is already calculated for this pair
67
68 Double_t fInvMass; //invariant mass
69 Bool_t fInvMassNotCalc;//flag indicating if fInvMass is already calculated for this pair
70
71 Double_t fKt; //K == sum vector of particle's momenta. Kt transverse component
72 Bool_t fKtNotCalc;//flag indicating if fKt is already calculated for this pair
73
30025bb4 74 Double_t fKStar; //
1b446896 75 Bool_t fKStarNotCalc;
76
77 Double_t fPInv; //invariant momentum
78 Double_t fQSide; //Q Side
79 Double_t fOut;//Q Out
80 Double_t fQLong;//Q Long
81
82
83 Double_t fInvMassSqr;//squre of invariant mass
84 Bool_t fMassSqrNotCalc; //
85 void CalculateInvMassSqr();
86
87 Double_t fQInvL;
88 Bool_t fQInvLNotCalc;
89 void CalculateQInvL();
90
91 Double_t fPxSum;
92 Double_t fPySum;
93 Double_t fPzSum;
94 Double_t fESum;
95 Bool_t fSumsNotCalc;
96 void CalculateSums();
97
98 Double_t fPxDiff;
99 Double_t fPyDiff;
100 Double_t fPzDiff;
101 Double_t fEDiff;
102 Bool_t fDiffsNotCalc;
103 void CalculateDiffs();
104
105
106 /***************************************************/
107 void CalculateBase();
108 Bool_t fChanged;
109
110
111 private:
112 public:
113 ClassDef(AliHBTPair,1)
114};
115/****************************************************************/
116inline
117void AliHBTPair::SetParticles(AliHBTParticle* p1,AliHBTParticle* p2)
118{
119 //sets the particle to the pair
120
121 fPart1 = p1;
122 fPart2 = p2;
123 if (fSwapedPair) //if we have Swaped (so we are not)
124 fSwapedPair->SetParticles(p2,p1); //set particles for him too
ec6e4013 125 Changed();
126 //and do nothing until will be asked for
127}
128/****************************************************************/
1b446896 129
ec6e4013 130inline
131void AliHBTPair::Changed()
132{
133 // Resel all calculations (flags)
1b446896 134 fChanged = kTRUE;
135 fSumsNotCalc = kTRUE;
136 fDiffsNotCalc = kTRUE;
137 fMassSqrNotCalc = kTRUE;
138 fInvMassNotCalc = kTRUE;
139 fQInvNotCalc = kTRUE;
140 fQSideCMSLCNotCalc = kTRUE;
141 fQOutCMSLCNotCalc = kTRUE;
142 fQLongCMSLCNotCalc = kTRUE;
143 fKtNotCalc = kTRUE;
144 fKStarNotCalc = kTRUE;
145 fQInvLNotCalc = kTRUE;
1b446896 146}
147/****************************************************************/
1b446896 148inline
149void AliHBTPair::CalculateInvMassSqr()
150 {
151 if (fMassSqrNotCalc)
152 {
153 CalculateSums();
154
155 Double_t fPart12s= (fPxSum*fPxSum) + (fPySum*fPySum) + (fPzSum*fPzSum);
156
157 fInvMassSqr=fESum*fESum-fPart12s;
158
159 fMassSqrNotCalc = kFALSE;
160 }
161 }
162/****************************************************************/
163inline
164void AliHBTPair::CalculateQInvL()
165 {
7836ee94 166 //Calculates square root of Qinv
1b446896 167 if (fQInvLNotCalc)
168 {
169 CalculateDiffs();
170 fQInvL = fEDiff*fEDiff - ( fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff );
171 fQInvLNotCalc = kFALSE;
172 }
173 }
174/****************************************************************/
175inline
176void AliHBTPair::CalculateSums()
177 {
178 if(fSumsNotCalc)
179 {
180 fPxSum = fPart1->Px()+fPart2->Px();
181 fPySum = fPart1->Py()+fPart2->Py();
182 fPzSum = fPart1->Pz()+fPart2->Pz();
183 fESum = fPart1->Energy() + fPart2->Energy();
184 fSumsNotCalc = kFALSE;
185 }
186 }
187/****************************************************************/
188inline
189void AliHBTPair::CalculateDiffs()
190 {
191 if(fDiffsNotCalc)
192 {
193 fPxDiff = fPart1->Px()-fPart2->Px();
194 fPyDiff = fPart1->Py()-fPart2->Py();
195 fPzDiff = fPart1->Pz()-fPart2->Pz();
196 fEDiff = fPart1->Energy() - fPart2->Energy();
197 fDiffsNotCalc = kFALSE;
198 }
199 }
200
7836ee94 201/****************************************************************/
202inline
203Double_t AliHBTPair::GetDeltaP() //return difference of momenta
204{
205 CalculateDiffs();
206 return TMath::Sqrt(fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff);
207}
208/****************************************************************/
209inline
210Double_t AliHBTPair::GetDeltaPx()
211 {
212 CalculateDiffs();
213 return fPxDiff;
214 }
215/****************************************************************/
216inline
217Double_t AliHBTPair::GetDeltaPy()
218 {
219 CalculateDiffs();
220 return fPyDiff;
221 }
222
223/****************************************************************/
224inline
225Double_t AliHBTPair::GetDeltaPz()
226 {
227 CalculateDiffs();
228 return fPzDiff;
229 }
230
231
1b446896 232#endif