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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 | ||
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 | /****************************************************************/ | |
114 | inline | |
115 | void 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 | /****************************************************************/ |
143 | inline | |
144 | void 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 | /****************************************************************/ | |
158 | inline | |
159 | void 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 | /****************************************************************/ | |
170 | inline | |
171 | void 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 | /****************************************************************/ | |
183 | inline | |
184 | void 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 | /****************************************************************/ |
197 | inline | |
198 | Double_t AliHBTPair::GetDeltaP() //return difference of momenta | |
199 | { | |
200 | CalculateDiffs(); | |
201 | return TMath::Sqrt(fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff); | |
202 | } | |
203 | /****************************************************************/ | |
204 | inline | |
205 | Double_t AliHBTPair::GetDeltaPx() | |
206 | { | |
207 | CalculateDiffs(); | |
208 | return fPxDiff; | |
209 | } | |
210 | /****************************************************************/ | |
211 | inline | |
212 | Double_t AliHBTPair::GetDeltaPy() | |
213 | { | |
214 | CalculateDiffs(); | |
215 | return fPyDiff; | |
216 | } | |
217 | ||
218 | /****************************************************************/ | |
219 | inline | |
220 | Double_t AliHBTPair::GetDeltaPz() | |
221 | { | |
222 | CalculateDiffs(); | |
223 | return fPzDiff; | |
224 | } | |
225 | ||
226 | ||
1b446896 | 227 | #endif |