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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 | ||
12 | class AliHBTPair: public TObject | |
13 | { | |
14 | public: | |
15 | AliHBTPair(Bool_t rev = kFALSE); //contructor | |
16 | ~AliHBTPair(){} | |
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 | ||
27 | Double_t GetQSideCMSLC(); //returns Q Side CMS longitudionally co-moving | |
28 | Double_t GetQOutCMSLC(); //returns Q out CMS longitudionally co-moving | |
29 | Double_t GetQLongCMSLC(); //returns Q Long CMS longitudionally co-moving | |
30 | ||
31 | ||
32 | Double_t GetKt(); //returns K transverse | |
33 | Double_t GetKStar(); | |
34 | ||
35 | Double_t GetQInv(); //returns Q invariant | |
36 | Double_t GetQSide(); //returns Q side | |
37 | Double_t GetQLong(); //returns Q long | |
38 | Double_t GetQOut(); //returns Q out | |
39 | ||
40 | ||
41 | protected: | |
42 | AliHBTParticle* fPart1; //pointer to first particle | |
43 | AliHBTParticle* fPart2; //pointer to second particle | |
44 | ||
45 | AliHBTPair* fSwapedPair; //pointer to swapped pair | |
46 | ||
47 | /************************************************************/ | |
48 | /************CMS (LC) Q's *********************************/ | |
49 | /************************************************************/ | |
50 | //Center Mass System - Longitudinally Comoving | |
51 | ||
52 | Double_t fQSideCMSLC; //value of Q side CMS longitudially co-moving | |
53 | Bool_t fQSideCMSLCNotCalc; //flag indicating if fQSideCMSLC is already calculated for this pair | |
54 | ||
55 | Double_t fQOutCMSLC; //value of Q out CMS longitudially co-moving | |
56 | Bool_t fQOutCMSLCNotCalc;//flag indicating if fQOutCMSLC is already calculated for this pair | |
57 | ||
58 | Double_t fQLongCMSLC; //value of Q long CMS longitudially co-moving | |
59 | Bool_t fQLongCMSLCNotCalc;//flag indicating if fQLongCMSLC is already calculated for this pair | |
60 | /************************************************************/ | |
61 | /************************************************************/ | |
62 | Double_t fQInv; //half of differnece of 4-momenta | |
63 | Bool_t fQInvNotCalc;//flag indicating if fQInv is already calculated for this pair | |
64 | ||
65 | Double_t fInvMass; //invariant mass | |
66 | Bool_t fInvMassNotCalc;//flag indicating if fInvMass is already calculated for this pair | |
67 | ||
68 | Double_t fKt; //K == sum vector of particle's momenta. Kt transverse component | |
69 | Bool_t fKtNotCalc;//flag indicating if fKt is already calculated for this pair | |
70 | ||
30025bb4 | 71 | Double_t fKStar; // |
1b446896 | 72 | Bool_t fKStarNotCalc; |
73 | ||
74 | Double_t fPInv; //invariant momentum | |
75 | Double_t fQSide; //Q Side | |
76 | Double_t fOut;//Q Out | |
77 | Double_t fQLong;//Q Long | |
78 | ||
79 | ||
80 | Double_t fInvMassSqr;//squre of invariant mass | |
81 | Bool_t fMassSqrNotCalc; // | |
82 | void CalculateInvMassSqr(); | |
83 | ||
84 | Double_t fQInvL; | |
85 | Bool_t fQInvLNotCalc; | |
86 | void CalculateQInvL(); | |
87 | ||
88 | Double_t fPxSum; | |
89 | Double_t fPySum; | |
90 | Double_t fPzSum; | |
91 | Double_t fESum; | |
92 | Bool_t fSumsNotCalc; | |
93 | void CalculateSums(); | |
94 | ||
95 | Double_t fPxDiff; | |
96 | Double_t fPyDiff; | |
97 | Double_t fPzDiff; | |
98 | Double_t fEDiff; | |
99 | Bool_t fDiffsNotCalc; | |
100 | void CalculateDiffs(); | |
101 | ||
102 | ||
103 | /***************************************************/ | |
104 | void CalculateBase(); | |
105 | Bool_t fChanged; | |
106 | ||
107 | ||
108 | private: | |
109 | public: | |
110 | ClassDef(AliHBTPair,1) | |
111 | }; | |
112 | /****************************************************************/ | |
113 | inline | |
114 | void AliHBTPair::SetParticles(AliHBTParticle* p1,AliHBTParticle* p2) | |
115 | { | |
116 | //sets the particle to the pair | |
117 | ||
118 | fPart1 = p1; | |
119 | fPart2 = p2; | |
120 | if (fSwapedPair) //if we have Swaped (so we are not) | |
121 | fSwapedPair->SetParticles(p2,p1); //set particles for him too | |
122 | ||
123 | // Resel all calculations (flags) | |
124 | ||
125 | fChanged = kTRUE; | |
126 | fSumsNotCalc = kTRUE; | |
127 | fDiffsNotCalc = kTRUE; | |
128 | fMassSqrNotCalc = kTRUE; | |
129 | fInvMassNotCalc = kTRUE; | |
130 | fQInvNotCalc = kTRUE; | |
131 | fQSideCMSLCNotCalc = kTRUE; | |
132 | fQOutCMSLCNotCalc = kTRUE; | |
133 | fQLongCMSLCNotCalc = kTRUE; | |
134 | fKtNotCalc = kTRUE; | |
135 | fKStarNotCalc = kTRUE; | |
136 | fQInvLNotCalc = kTRUE; | |
137 | ||
138 | //and do nothing until will be asked for | |
139 | } | |
140 | /****************************************************************/ | |
1b446896 | 141 | /****************************************************************/ |
142 | inline | |
143 | void AliHBTPair::CalculateInvMassSqr() | |
144 | { | |
145 | if (fMassSqrNotCalc) | |
146 | { | |
147 | CalculateSums(); | |
148 | ||
149 | Double_t fPart12s= (fPxSum*fPxSum) + (fPySum*fPySum) + (fPzSum*fPzSum); | |
150 | ||
151 | fInvMassSqr=fESum*fESum-fPart12s; | |
152 | ||
153 | fMassSqrNotCalc = kFALSE; | |
154 | } | |
155 | } | |
156 | /****************************************************************/ | |
157 | inline | |
158 | void AliHBTPair::CalculateQInvL() | |
159 | { | |
160 | if (fQInvLNotCalc) | |
161 | { | |
162 | CalculateDiffs(); | |
163 | fQInvL = fEDiff*fEDiff - ( fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff ); | |
164 | fQInvLNotCalc = kFALSE; | |
165 | } | |
166 | } | |
167 | /****************************************************************/ | |
168 | inline | |
169 | void AliHBTPair::CalculateSums() | |
170 | { | |
171 | if(fSumsNotCalc) | |
172 | { | |
173 | fPxSum = fPart1->Px()+fPart2->Px(); | |
174 | fPySum = fPart1->Py()+fPart2->Py(); | |
175 | fPzSum = fPart1->Pz()+fPart2->Pz(); | |
176 | fESum = fPart1->Energy() + fPart2->Energy(); | |
177 | fSumsNotCalc = kFALSE; | |
178 | } | |
179 | } | |
180 | /****************************************************************/ | |
181 | inline | |
182 | void AliHBTPair::CalculateDiffs() | |
183 | { | |
184 | if(fDiffsNotCalc) | |
185 | { | |
186 | fPxDiff = fPart1->Px()-fPart2->Px(); | |
187 | fPyDiff = fPart1->Py()-fPart2->Py(); | |
188 | fPzDiff = fPart1->Pz()-fPart2->Pz(); | |
189 | fEDiff = fPart1->Energy() - fPart2->Energy(); | |
190 | fDiffsNotCalc = kFALSE; | |
191 | } | |
192 | } | |
193 | ||
194 | #endif |