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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(); |
47d9a058 | 44 | Double_t GetLLWeight(); |
1b446896 | 45 | protected: |
46 | AliHBTParticle* fPart1; //pointer to first particle | |
47 | AliHBTParticle* fPart2; //pointer to second particle | |
48 | ||
49 | AliHBTPair* fSwapedPair; //pointer to swapped pair | |
50 | ||
51 | /************************************************************/ | |
52 | /************CMS (LC) Q's *********************************/ | |
53 | /************************************************************/ | |
54 | //Center Mass System - Longitudinally Comoving | |
55 | ||
56 | Double_t fQSideCMSLC; //value of Q side CMS longitudially co-moving | |
57 | Bool_t fQSideCMSLCNotCalc; //flag indicating if fQSideCMSLC is already calculated for this pair | |
58 | ||
59 | Double_t fQOutCMSLC; //value of Q out CMS longitudially co-moving | |
60 | Bool_t fQOutCMSLCNotCalc;//flag indicating if fQOutCMSLC is already calculated for this pair | |
61 | ||
62 | Double_t fQLongCMSLC; //value of Q long CMS longitudially co-moving | |
63 | Bool_t fQLongCMSLCNotCalc;//flag indicating if fQLongCMSLC is already calculated for this pair | |
64 | /************************************************************/ | |
65 | /************************************************************/ | |
66 | Double_t fQInv; //half of differnece of 4-momenta | |
67 | Bool_t fQInvNotCalc;//flag indicating if fQInv is already calculated for this pair | |
68 | ||
69 | Double_t fInvMass; //invariant mass | |
70 | Bool_t fInvMassNotCalc;//flag indicating if fInvMass is already calculated for this pair | |
71 | ||
72 | Double_t fKt; //K == sum vector of particle's momenta. Kt transverse component | |
73 | Bool_t fKtNotCalc;//flag indicating if fKt is already calculated for this pair | |
74 | ||
30025bb4 | 75 | Double_t fKStar; // |
1b446896 | 76 | Bool_t fKStarNotCalc; |
77 | ||
78 | Double_t fPInv; //invariant momentum | |
951aadb9 | 79 | |
1b446896 | 80 | Double_t fQSide; //Q Side |
81 | Double_t fOut;//Q Out | |
82 | Double_t fQLong;//Q Long | |
83 | ||
951aadb9 | 84 | Double_t fMt;//Transverse coordinate of Inv. Mass |
85 | Bool_t fMtNotCalc;//flag indicating if Mt is calculated | |
86 | ||
1b446896 | 87 | Double_t fInvMassSqr;//squre of invariant mass |
88 | Bool_t fMassSqrNotCalc; // | |
89 | void CalculateInvMassSqr(); | |
90 | ||
91 | Double_t fQInvL; | |
92 | Bool_t fQInvLNotCalc; | |
93 | void CalculateQInvL(); | |
47d9a058 | 94 | |
95 | Double_t fLLWeight; | |
96 | Bool_t ffLLWeightNotCalc; | |
1b446896 | 97 | |
98 | Double_t fPxSum; | |
99 | Double_t fPySum; | |
100 | Double_t fPzSum; | |
101 | Double_t fESum; | |
102 | Bool_t fSumsNotCalc; | |
103 | void CalculateSums(); | |
104 | ||
105 | Double_t fPxDiff; | |
106 | Double_t fPyDiff; | |
107 | Double_t fPzDiff; | |
108 | Double_t fEDiff; | |
109 | Bool_t fDiffsNotCalc; | |
110 | void CalculateDiffs(); | |
111 | ||
951aadb9 | 112 | Double_t fGammaCMSLC; |
113 | Bool_t fGammaCMSLCNotCalc; | |
1b446896 | 114 | /***************************************************/ |
115 | void CalculateBase(); | |
116 | Bool_t fChanged; | |
117 | ||
118 | ||
119 | private: | |
120 | public: | |
121 | ClassDef(AliHBTPair,1) | |
122 | }; | |
123 | /****************************************************************/ | |
124 | inline | |
125 | void AliHBTPair::SetParticles(AliHBTParticle* p1,AliHBTParticle* p2) | |
126 | { | |
127 | //sets the particle to the pair | |
128 | ||
129 | fPart1 = p1; | |
130 | fPart2 = p2; | |
131 | if (fSwapedPair) //if we have Swaped (so we are not) | |
132 | fSwapedPair->SetParticles(p2,p1); //set particles for him too | |
ec6e4013 | 133 | Changed(); |
134 | //and do nothing until will be asked for | |
135 | } | |
136 | /****************************************************************/ | |
1b446896 | 137 | |
ec6e4013 | 138 | inline |
139 | void AliHBTPair::Changed() | |
140 | { | |
141 | // Resel all calculations (flags) | |
1b446896 | 142 | fChanged = kTRUE; |
143 | fSumsNotCalc = kTRUE; | |
144 | fDiffsNotCalc = kTRUE; | |
145 | fMassSqrNotCalc = kTRUE; | |
146 | fInvMassNotCalc = kTRUE; | |
147 | fQInvNotCalc = kTRUE; | |
951aadb9 | 148 | fMtNotCalc = kTRUE; |
1b446896 | 149 | fQSideCMSLCNotCalc = kTRUE; |
150 | fQOutCMSLCNotCalc = kTRUE; | |
151 | fQLongCMSLCNotCalc = kTRUE; | |
152 | fKtNotCalc = kTRUE; | |
153 | fKStarNotCalc = kTRUE; | |
154 | fQInvLNotCalc = kTRUE; | |
951aadb9 | 155 | fGammaCMSLCNotCalc = kTRUE; |
47d9a058 | 156 | ffLLWeightNotCalc = kTRUE; |
1b446896 | 157 | } |
158 | /****************************************************************/ | |
1b446896 | 159 | inline |
160 | void AliHBTPair::CalculateInvMassSqr() | |
161 | { | |
162 | if (fMassSqrNotCalc) | |
163 | { | |
164 | CalculateSums(); | |
165 | ||
166 | Double_t fPart12s= (fPxSum*fPxSum) + (fPySum*fPySum) + (fPzSum*fPzSum); | |
167 | ||
168 | fInvMassSqr=fESum*fESum-fPart12s; | |
169 | ||
170 | fMassSqrNotCalc = kFALSE; | |
171 | } | |
172 | } | |
173 | /****************************************************************/ | |
174 | inline | |
175 | void AliHBTPair::CalculateQInvL() | |
176 | { | |
7836ee94 | 177 | //Calculates square root of Qinv |
1b446896 | 178 | if (fQInvLNotCalc) |
179 | { | |
180 | CalculateDiffs(); | |
181 | fQInvL = fEDiff*fEDiff - ( fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff ); | |
182 | fQInvLNotCalc = kFALSE; | |
183 | } | |
184 | } | |
185 | /****************************************************************/ | |
186 | inline | |
187 | void AliHBTPair::CalculateSums() | |
188 | { | |
189 | if(fSumsNotCalc) | |
190 | { | |
191 | fPxSum = fPart1->Px()+fPart2->Px(); | |
192 | fPySum = fPart1->Py()+fPart2->Py(); | |
193 | fPzSum = fPart1->Pz()+fPart2->Pz(); | |
194 | fESum = fPart1->Energy() + fPart2->Energy(); | |
195 | fSumsNotCalc = kFALSE; | |
196 | } | |
197 | } | |
198 | /****************************************************************/ | |
199 | inline | |
200 | void AliHBTPair::CalculateDiffs() | |
201 | { | |
202 | if(fDiffsNotCalc) | |
203 | { | |
204 | fPxDiff = fPart1->Px()-fPart2->Px(); | |
205 | fPyDiff = fPart1->Py()-fPart2->Py(); | |
206 | fPzDiff = fPart1->Pz()-fPart2->Pz(); | |
207 | fEDiff = fPart1->Energy() - fPart2->Energy(); | |
208 | fDiffsNotCalc = kFALSE; | |
209 | } | |
210 | } | |
211 | ||
7836ee94 | 212 | /****************************************************************/ |
213 | inline | |
214 | Double_t AliHBTPair::GetDeltaP() //return difference of momenta | |
215 | { | |
216 | CalculateDiffs(); | |
217 | return TMath::Sqrt(fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff); | |
218 | } | |
219 | /****************************************************************/ | |
220 | inline | |
221 | Double_t AliHBTPair::GetDeltaPx() | |
222 | { | |
223 | CalculateDiffs(); | |
224 | return fPxDiff; | |
225 | } | |
226 | /****************************************************************/ | |
227 | inline | |
228 | Double_t AliHBTPair::GetDeltaPy() | |
229 | { | |
230 | CalculateDiffs(); | |
231 | return fPyDiff; | |
232 | } | |
233 | ||
234 | /****************************************************************/ | |
235 | inline | |
236 | Double_t AliHBTPair::GetDeltaPz() | |
237 | { | |
238 | CalculateDiffs(); | |
239 | return fPzDiff; | |
240 | } | |
241 | ||
242 | ||
1b446896 | 243 | #endif |