]>
Commit | Line | Data |
---|---|---|
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 | ||
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 | /****************************************************************/ | |
116 | inline | |
117 | void 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 | 130 | inline |
131 | void 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 | 148 | inline |
149 | void 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 | /****************************************************************/ | |
163 | inline | |
164 | void 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 | /****************************************************************/ | |
175 | inline | |
176 | void 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 | /****************************************************************/ | |
188 | inline | |
189 | void 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 | /****************************************************************/ |
202 | inline | |
203 | Double_t AliHBTPair::GetDeltaP() //return difference of momenta | |
204 | { | |
205 | CalculateDiffs(); | |
206 | return TMath::Sqrt(fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff); | |
207 | } | |
208 | /****************************************************************/ | |
209 | inline | |
210 | Double_t AliHBTPair::GetDeltaPx() | |
211 | { | |
212 | CalculateDiffs(); | |
213 | return fPxDiff; | |
214 | } | |
215 | /****************************************************************/ | |
216 | inline | |
217 | Double_t AliHBTPair::GetDeltaPy() | |
218 | { | |
219 | CalculateDiffs(); | |
220 | return fPyDiff; | |
221 | } | |
222 | ||
223 | /****************************************************************/ | |
224 | inline | |
225 | Double_t AliHBTPair::GetDeltaPz() | |
226 | { | |
227 | CalculateDiffs(); | |
228 | return fPzDiff; | |
229 | } | |
230 | ||
231 | ||
1b446896 | 232 | #endif |