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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 | |
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 | ||
951aadb9 | 27 | virtual Double_t GetInvMass(); //returns invariant mass of the pair |
28 | virtual Double_t GetMt(); | |
29 | virtual Double_t GetQInv(); //returns Q invariant | |
30 | virtual Double_t GetQSideCMSLC(); //returns Q Side CMS longitudionally co-moving | |
31 | virtual Double_t GetQOutCMSLC(); //returns Q out CMS longitudionally co-moving | |
32 | virtual Double_t GetQLongCMSLC(); //returns Q Long CMS longitudionally co-moving | |
1b446896 | 33 | |
34 | ||
951aadb9 | 35 | virtual Double_t GetKt(); //returns K transverse |
36 | virtual Double_t GetKStar(); | |
1b446896 | 37 | |
951aadb9 | 38 | virtual Double_t GetDeltaP(); //return difference of momenta |
39 | virtual Double_t GetDeltaPx(); | |
40 | virtual Double_t GetDeltaPy(); | |
41 | virtual Double_t GetDeltaPz(); | |
1b446896 | 42 | |
951aadb9 | 43 | virtual Double_t GetGammaToCMSLC(); |
1b446896 | 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 | |
951aadb9 | 78 | |
1b446896 | 79 | Double_t fQSide; //Q Side |
80 | Double_t fOut;//Q Out | |
81 | Double_t fQLong;//Q Long | |
82 | ||
951aadb9 | 83 | Double_t fMt;//Transverse coordinate of Inv. Mass |
84 | Bool_t fMtNotCalc;//flag indicating if Mt is calculated | |
85 | ||
1b446896 | 86 | Double_t fInvMassSqr;//squre of invariant mass |
87 | Bool_t fMassSqrNotCalc; // | |
88 | void CalculateInvMassSqr(); | |
89 | ||
90 | Double_t fQInvL; | |
91 | Bool_t fQInvLNotCalc; | |
92 | void CalculateQInvL(); | |
93 | ||
94 | Double_t fPxSum; | |
95 | Double_t fPySum; | |
96 | Double_t fPzSum; | |
97 | Double_t fESum; | |
98 | Bool_t fSumsNotCalc; | |
99 | void CalculateSums(); | |
100 | ||
101 | Double_t fPxDiff; | |
102 | Double_t fPyDiff; | |
103 | Double_t fPzDiff; | |
104 | Double_t fEDiff; | |
105 | Bool_t fDiffsNotCalc; | |
106 | void CalculateDiffs(); | |
107 | ||
951aadb9 | 108 | Double_t fGammaCMSLC; |
109 | Bool_t fGammaCMSLCNotCalc; | |
1b446896 | 110 | /***************************************************/ |
111 | void CalculateBase(); | |
112 | Bool_t fChanged; | |
113 | ||
114 | ||
115 | private: | |
116 | public: | |
117 | ClassDef(AliHBTPair,1) | |
118 | }; | |
119 | /****************************************************************/ | |
120 | inline | |
121 | void AliHBTPair::SetParticles(AliHBTParticle* p1,AliHBTParticle* p2) | |
122 | { | |
123 | //sets the particle to the pair | |
124 | ||
125 | fPart1 = p1; | |
126 | fPart2 = p2; | |
127 | if (fSwapedPair) //if we have Swaped (so we are not) | |
128 | fSwapedPair->SetParticles(p2,p1); //set particles for him too | |
ec6e4013 | 129 | Changed(); |
130 | //and do nothing until will be asked for | |
131 | } | |
132 | /****************************************************************/ | |
1b446896 | 133 | |
ec6e4013 | 134 | inline |
135 | void AliHBTPair::Changed() | |
136 | { | |
137 | // Resel all calculations (flags) | |
1b446896 | 138 | fChanged = kTRUE; |
139 | fSumsNotCalc = kTRUE; | |
140 | fDiffsNotCalc = kTRUE; | |
141 | fMassSqrNotCalc = kTRUE; | |
142 | fInvMassNotCalc = kTRUE; | |
143 | fQInvNotCalc = kTRUE; | |
951aadb9 | 144 | fMtNotCalc = kTRUE; |
1b446896 | 145 | fQSideCMSLCNotCalc = kTRUE; |
146 | fQOutCMSLCNotCalc = kTRUE; | |
147 | fQLongCMSLCNotCalc = kTRUE; | |
148 | fKtNotCalc = kTRUE; | |
149 | fKStarNotCalc = kTRUE; | |
150 | fQInvLNotCalc = kTRUE; | |
951aadb9 | 151 | fGammaCMSLCNotCalc = kTRUE; |
1b446896 | 152 | } |
153 | /****************************************************************/ | |
1b446896 | 154 | inline |
155 | void AliHBTPair::CalculateInvMassSqr() | |
156 | { | |
157 | if (fMassSqrNotCalc) | |
158 | { | |
159 | CalculateSums(); | |
160 | ||
161 | Double_t fPart12s= (fPxSum*fPxSum) + (fPySum*fPySum) + (fPzSum*fPzSum); | |
162 | ||
163 | fInvMassSqr=fESum*fESum-fPart12s; | |
164 | ||
165 | fMassSqrNotCalc = kFALSE; | |
166 | } | |
167 | } | |
168 | /****************************************************************/ | |
169 | inline | |
170 | void AliHBTPair::CalculateQInvL() | |
171 | { | |
7836ee94 | 172 | //Calculates square root of Qinv |
1b446896 | 173 | if (fQInvLNotCalc) |
174 | { | |
175 | CalculateDiffs(); | |
176 | fQInvL = fEDiff*fEDiff - ( fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff ); | |
177 | fQInvLNotCalc = kFALSE; | |
178 | } | |
179 | } | |
180 | /****************************************************************/ | |
181 | inline | |
182 | void AliHBTPair::CalculateSums() | |
183 | { | |
184 | if(fSumsNotCalc) | |
185 | { | |
186 | fPxSum = fPart1->Px()+fPart2->Px(); | |
187 | fPySum = fPart1->Py()+fPart2->Py(); | |
188 | fPzSum = fPart1->Pz()+fPart2->Pz(); | |
189 | fESum = fPart1->Energy() + fPart2->Energy(); | |
190 | fSumsNotCalc = kFALSE; | |
191 | } | |
192 | } | |
193 | /****************************************************************/ | |
194 | inline | |
195 | void AliHBTPair::CalculateDiffs() | |
196 | { | |
197 | if(fDiffsNotCalc) | |
198 | { | |
199 | fPxDiff = fPart1->Px()-fPart2->Px(); | |
200 | fPyDiff = fPart1->Py()-fPart2->Py(); | |
201 | fPzDiff = fPart1->Pz()-fPart2->Pz(); | |
202 | fEDiff = fPart1->Energy() - fPart2->Energy(); | |
203 | fDiffsNotCalc = kFALSE; | |
204 | } | |
205 | } | |
206 | ||
7836ee94 | 207 | /****************************************************************/ |
208 | inline | |
209 | Double_t AliHBTPair::GetDeltaP() //return difference of momenta | |
210 | { | |
211 | CalculateDiffs(); | |
212 | return TMath::Sqrt(fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff); | |
213 | } | |
214 | /****************************************************************/ | |
215 | inline | |
216 | Double_t AliHBTPair::GetDeltaPx() | |
217 | { | |
218 | CalculateDiffs(); | |
219 | return fPxDiff; | |
220 | } | |
221 | /****************************************************************/ | |
222 | inline | |
223 | Double_t AliHBTPair::GetDeltaPy() | |
224 | { | |
225 | CalculateDiffs(); | |
226 | return fPyDiff; | |
227 | } | |
228 | ||
229 | /****************************************************************/ | |
230 | inline | |
231 | Double_t AliHBTPair::GetDeltaPz() | |
232 | { | |
233 | CalculateDiffs(); | |
234 | return fPzDiff; | |
235 | } | |
236 | ||
237 | ||
1b446896 | 238 | #endif |