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78d7c6d3 | 1 | #ifndef AliAODPair_H |
2 | #define AliAODPair_H | |
3 | //_________________________________________________________________________ | |
4 | /////////////////////////////////////////////////////////////////////////// | |
5 | // | |
6 | // class AliAODPair | |
7 | // | |
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 | //////////////////////////////////////////////////////////////////////////// | |
13 | ||
14 | #include <TObject.h> | |
15 | #include "AliVAODParticle.h" | |
16 | ||
17 | ||
18 | class AliAODPair: public TObject | |
19 | { | |
20 | public: | |
21 | AliAODPair(Bool_t rev = kFALSE); //contructor | |
22 | AliAODPair(AliVAODParticle* part1, AliVAODParticle* part2, Bool_t rev = kFALSE); //contructor | |
23 | AliAODPair(const AliAODPair& in); | |
24 | ||
25 | virtual ~AliAODPair(){} | |
26 | ||
27 | AliAODPair& operator=(const AliAODPair& in); | |
28 | ||
29 | void SetParticles(AliVAODParticle* p1,AliVAODParticle* p2); //sets particles in the pair | |
30 | AliAODPair* GetSwappedPair() {return fSwappedPair;} //returns pair with swapped particles | |
31 | ||
32 | AliVAODParticle* Particle1() const {return fPart1;} //returns pointer to first particle | |
33 | AliVAODParticle* Particle2() const {return fPart2;} //returns pointer to decond particle | |
34 | ||
35 | virtual void Changed(); | |
36 | //Center Mass System - Longitudinally Comoving | |
37 | ||
38 | virtual Double_t GetInvMass(); //returns invariant mass of the pair | |
39 | virtual Double_t GetMt(); | |
40 | virtual Double_t GetQInv(); //returns Q invariant | |
41 | virtual Double_t GetQSideLCMS(); //returns Q Side CMS longitudionally co-moving | |
42 | virtual Double_t GetQOutLCMS(); //returns Q out CMS longitudionally co-moving | |
43 | virtual Double_t GetQLongLCMS(); //returns Q Long CMS longitudionally co-moving | |
f422a7da | 44 | virtual Double_t GetQtLCMS(); //returns Q transverse CMS longitudionally co-moving |
45 | ||
fb629e2d | 46 | virtual Double_t GetQt(); //returns Q transverse to Kt |
78d7c6d3 | 47 | |
48 | ||
49 | virtual Double_t GetKt(); //returns K transverse | |
50 | virtual Double_t GetKStar(); | |
a40c0433 | 51 | virtual Double_t GetKStarOut(); //z.ch. |
52 | virtual Double_t GetKStarSide(); //z.ch. | |
53 | virtual Double_t GetKStarLong(); //z.ch. | |
78d7c6d3 | 54 | |
a40c0433 | 55 | |
78d7c6d3 | 56 | virtual Double_t GetAvarageDistance();//returns avarage distnace between two tracks |
57 | ||
b327f095 | 58 | virtual Double_t GetDeltaE(); //return difference of Energies |
59 | virtual Double_t GetDeltaP(); //return difference of momenta (scalar difference) | |
60 | virtual Double_t GetDeltaPvector(); //return legth of difference vector of momenta | |
78d7c6d3 | 61 | virtual Double_t GetDeltaPt(); |
62 | virtual Double_t GetDeltaPx(); | |
63 | virtual Double_t GetDeltaPy(); | |
64 | virtual Double_t GetDeltaPz(); | |
65 | ||
66 | virtual Double_t GetDeltaTheta(); | |
67 | virtual Double_t GetDeltaPhi(); | |
68 | ||
69 | virtual Double_t GetGammaToLCMS(); | |
70 | virtual Double_t GetPIDProb() const {return fPart1->GetPidProb()*fPart2->GetPidProb();} | |
71 | ||
8ea30edc | 72 | virtual Double_t GetRStar() ; |
73 | virtual Double_t GetR() ;//returns distance between particle production points | |
74 | ||
78d7c6d3 | 75 | protected: |
76 | AliVAODParticle* fPart1; //pointer to first particle | |
77 | AliVAODParticle* fPart2; //pointer to second particle | |
78 | ||
79 | AliAODPair* fSwappedPair; //pointer to swapped pair | |
80 | ||
81 | /************************************************************/ | |
82 | /************CMS (LC) Q's *********************************/ | |
83 | /************************************************************/ | |
84 | //Center Mass System - Longitudinally Comoving | |
85 | ||
86 | Double_t fQSideLCMS; //value of Q side CMS longitudially co-moving | |
87 | Bool_t fQSideLCMSNotCalc; //flag indicating if fQSideLCMS is already calculated for this pair | |
88 | ||
89 | Double_t fQOutLCMS; //value of Q out CMS longitudially co-moving | |
90 | Bool_t fQOutLCMSNotCalc;//flag indicating if fQOutLCMS is already calculated for this pair | |
91 | ||
92 | Double_t fQLongLCMS; //value of Q long CMS longitudially co-moving | |
93 | Bool_t fQLongLCMSNotCalc;//flag indicating if fQLongLCMS is already calculated for this pair | |
f422a7da | 94 | |
fb629e2d | 95 | Double_t fQtLCMS; //value of Qt CMS longitudially co-moving (hypot(qsidelcms,qoutlcms)) |
f422a7da | 96 | Bool_t fQtLCMSNotCalc;//flag indicating if fQLongLCMS is already calculated for this pair |
fb629e2d | 97 | |
98 | Double_t fQt; //value of Qt, projection of 3-mom diff to Kt | |
99 | Bool_t fQtNotCalc;//flag indicating if fQt is already calculated for this pair | |
100 | ||
78d7c6d3 | 101 | /************************************************************/ |
102 | /************************************************************/ | |
103 | Double_t fQInv; //half of differnece of 4-momenta | |
104 | Bool_t fQInvNotCalc;//flag indicating if fQInv is already calculated for this pair | |
105 | ||
106 | Double_t fInvMass; //invariant mass | |
107 | Bool_t fInvMassNotCalc;//flag indicating if fInvMass is already calculated for this pair | |
108 | ||
109 | Double_t fKt; //K == sum vector of particle's momenta. Kt transverse component | |
110 | Bool_t fKtNotCalc;//flag indicating if fKt is already calculated for this pair | |
111 | ||
112 | Double_t fKStar; // KStar | |
113 | Bool_t fKStarNotCalc;// flag indicating if fKStar is calculated | |
a40c0433 | 114 | Double_t fKStarOut; // KStarOut z.ch. |
115 | Double_t fKStarSide;// KStarSide z.ch. | |
116 | Double_t fKStarLong;// KStarLong z.ch. | |
117 | ||
118 | Bool_t fKStarCompNotCalc; // flag indicating if CalcuteKStarComp() is calculated z.ch. | |
119 | ||
78d7c6d3 | 120 | Double_t fPInv; //invariant momentum |
121 | ||
122 | Double_t fQSide; //Q Side | |
123 | Double_t fOut;//Q Out | |
124 | Double_t fQLong;//Q Long | |
125 | ||
126 | Double_t fMt;//Transverse coordinate of Inv. Mass | |
127 | Bool_t fMtNotCalc;//flag indicating if Mt is calculated for current pair | |
128 | ||
129 | Double_t fInvMassSqr;//squre of invariant mass | |
130 | Bool_t fMassSqrNotCalc; //flag indicating if fInvMassSqr for this pair | |
131 | void CalculateInvMassSqr(); | |
132 | ||
133 | Double_t fQInvL; //Qinv in longitudional direction | |
134 | Bool_t fQInvLNotCalc;//flag indicating if fQInvL is calculated for current pair | |
135 | void CalculateQInvL(); | |
136 | ||
137 | Double_t fAvarageDistance;//value of the avarage distance calculated out of track points | |
138 | Bool_t fAvarageDistanceNotCalc;//flag indicating if the avarage distance is calculated | |
139 | ||
140 | Double_t fPxSum;// Sum of Px momenta | |
141 | Double_t fPySum;// Sum of Py momenta | |
142 | Double_t fPzSum;// Sum of Pz momenta | |
143 | Double_t fESum;// Sum of energies | |
144 | Bool_t fSumsNotCalc;//flag indicating if fPxSum,fPxSum,fPxSum and fESum is calculated for current pair | |
145 | void CalculateSums(); | |
a40c0433 | 146 | void CalculateKStarComp(); |
78d7c6d3 | 147 | |
148 | Double_t fPxDiff;// Difference of Px momenta | |
149 | Double_t fPyDiff;// Difference of Px momenta | |
150 | Double_t fPzDiff;// Difference of Px momenta | |
151 | Double_t fEDiff;// Difference of Px momenta | |
152 | Bool_t fDiffsNotCalc;//flag indicating if fPxDiff,fPxDiff,fPxDiff and fEDiff is calculated for current pair | |
153 | void CalculateDiffs(); | |
154 | ||
155 | Double_t fGammaLCMS;//gamma of boost in LCMS | |
156 | Bool_t fGammaLCMSNotCalc;//flag indicating if fGammaLCMS is calculated for current pair | |
157 | /***************************************************/ | |
158 | Bool_t fChanged;//flag indicating if object has been changed | |
159 | ||
160 | void CalculateBase(); | |
161 | Double_t AvDistance(); | |
162 | ||
163 | ||
164 | private: | |
165 | ClassDef(AliAODPair,1) | |
166 | }; | |
167 | /****************************************************************/ | |
168 | inline | |
169 | void AliAODPair::SetParticles(AliVAODParticle* p1,AliVAODParticle* p2) | |
170 | { | |
171 | //sets the particle to the pair | |
172 | ||
173 | fPart1 = p1; | |
174 | fPart2 = p2; | |
175 | if (fSwappedPair) //if we have Swapped (so we are not) | |
176 | fSwappedPair->SetParticles(p2,p1); //set particles for him too | |
177 | Changed(); | |
178 | //and do nothing until will be asked for | |
179 | } | |
180 | /****************************************************************/ | |
181 | ||
182 | inline | |
183 | void AliAODPair::Changed() | |
184 | { | |
185 | // Resel all calculations (flags) | |
186 | fChanged = kTRUE; | |
187 | fSumsNotCalc = kTRUE; | |
188 | fDiffsNotCalc = kTRUE; | |
189 | fMassSqrNotCalc = kTRUE; | |
190 | fInvMassNotCalc = kTRUE; | |
191 | fQInvNotCalc = kTRUE; | |
192 | fMtNotCalc = kTRUE; | |
193 | fQSideLCMSNotCalc = kTRUE; | |
194 | fQOutLCMSNotCalc = kTRUE; | |
195 | fQLongLCMSNotCalc = kTRUE; | |
fb629e2d | 196 | fQtLCMSNotCalc = kTRUE; |
197 | fQtNotCalc = kTRUE; | |
78d7c6d3 | 198 | fKtNotCalc = kTRUE; |
199 | fKStarNotCalc = kTRUE; | |
a40c0433 | 200 | fKStarCompNotCalc = kTRUE; |
78d7c6d3 | 201 | fQInvLNotCalc = kTRUE; |
202 | fGammaLCMSNotCalc = kTRUE; | |
203 | fAvarageDistanceNotCalc = kTRUE; | |
204 | } | |
205 | /****************************************************************/ | |
206 | inline | |
207 | void AliAODPair::CalculateInvMassSqr() | |
208 | { | |
209 | //calculates square of qinv | |
210 | if (fMassSqrNotCalc) | |
211 | { | |
212 | CalculateSums(); | |
213 | ||
214 | Double_t fPart12s= (fPxSum*fPxSum) + (fPySum*fPySum) + (fPzSum*fPzSum); | |
215 | ||
216 | fInvMassSqr=fESum*fESum-fPart12s; | |
217 | ||
218 | fMassSqrNotCalc = kFALSE; | |
219 | } | |
220 | } | |
221 | /****************************************************************/ | |
222 | inline | |
223 | void AliAODPair::CalculateQInvL() | |
224 | { | |
225 | //Calculates square root of Qinv | |
226 | if (fQInvLNotCalc) | |
227 | { | |
228 | CalculateDiffs(); | |
229 | fQInvL = fEDiff*fEDiff - ( fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff ); | |
230 | fQInvLNotCalc = kFALSE; | |
231 | } | |
232 | } | |
233 | /****************************************************************/ | |
234 | inline | |
235 | void AliAODPair::CalculateSums() | |
236 | { | |
237 | //calculates momenta and energy sums | |
238 | if(fSumsNotCalc) | |
239 | { | |
240 | fPxSum = fPart1->Px()+fPart2->Px(); | |
241 | fPySum = fPart1->Py()+fPart2->Py(); | |
242 | fPzSum = fPart1->Pz()+fPart2->Pz(); | |
243 | fESum = fPart1->E() + fPart2->E(); | |
244 | fSumsNotCalc = kFALSE; | |
245 | } | |
246 | } | |
a40c0433 | 247 | /****************************************************************/ |
248 | inline | |
249 | void AliAODPair::CalculateKStarComp() | |
250 | { | |
251 | ||
252 | if (fKStarCompNotCalc) | |
253 | { | |
254 | CalculateSums(); | |
255 | ||
256 | Double_t ptrans = fPxSum*fPxSum + fPySum*fPySum; | |
257 | Double_t mtrans = fESum*fESum - fPzSum*fPzSum; | |
258 | Double_t pinv = TMath::Sqrt(mtrans - ptrans); | |
259 | ptrans = TMath::Sqrt(ptrans); | |
260 | mtrans = TMath::Sqrt(mtrans); | |
261 | ||
262 | Double_t px1 = fPart1->Px(); | |
263 | Double_t py1 = fPart1->Py(); | |
264 | Double_t pz1 = fPart1->Pz(); | |
265 | Double_t pE1 = fPart1->E(); | |
266 | ||
267 | // boost to LCMS | |
268 | Double_t beta = fPzSum / fESum; | |
269 | Double_t gamma = fESum / mtrans; | |
270 | ||
271 | fKStarLong = gamma * (pz1 - beta * pE1); | |
272 | double temp = gamma * (pE1 - beta * pz1); | |
273 | ||
274 | // rotate in transverse plane | |
275 | fKStarSide = (-px1*fPySum + py1*fPxSum)/ptrans; | |
276 | fKStarOut = ( px1*fPxSum + py1*fPySum)/ptrans; | |
277 | ||
278 | // go from LCMS to CMS | |
279 | gamma = mtrans/pinv; | |
280 | beta = ptrans/mtrans; | |
281 | fKStarOut = gamma * (fKStarOut - beta * temp); | |
282 | ||
283 | fKStarCompNotCalc = kFALSE; | |
284 | } | |
285 | } | |
286 | ||
78d7c6d3 | 287 | /****************************************************************/ |
288 | inline | |
289 | void AliAODPair::CalculateDiffs() | |
290 | { | |
291 | //calculates momenta and energy differences | |
292 | if(fDiffsNotCalc) | |
293 | { | |
294 | fPxDiff = fPart1->Px()-fPart2->Px(); | |
295 | fPyDiff = fPart1->Py()-fPart2->Py(); | |
296 | fPzDiff = fPart1->Pz()-fPart2->Pz(); | |
297 | fEDiff = fPart1->E() - fPart2->E(); | |
298 | fDiffsNotCalc = kFALSE; | |
299 | } | |
300 | } | |
301 | ||
302 | /****************************************************************/ | |
b327f095 | 303 | |
304 | inline | |
305 | Double_t AliAODPair::GetDeltaE() | |
306 | { | |
307 | //returns difference of energies | |
308 | return fPart1->E() - fPart2->E(); | |
309 | } | |
310 | /****************************************************************/ | |
311 | ||
312 | inline | |
313 | Double_t AliAODPair::GetDeltaP() | |
314 | { | |
315 | //returns difference of momenta (scalars) | |
316 | return fPart1->P() - fPart2->P(); | |
317 | } | |
318 | /****************************************************************/ | |
319 | ||
78d7c6d3 | 320 | inline |
b327f095 | 321 | Double_t AliAODPair::GetDeltaPvector() //return difference of momenta |
78d7c6d3 | 322 | { |
b327f095 | 323 | //returns legth of the momenta difference vector |
78d7c6d3 | 324 | CalculateDiffs(); |
325 | return TMath::Sqrt(fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff); | |
326 | } | |
327 | /****************************************************************/ | |
328 | ||
329 | inline | |
330 | Double_t AliAODPair::GetDeltaPt() | |
331 | { | |
332 | //returns difference of Pz | |
333 | return fPart1->Pt()-fPart2->Pt(); | |
334 | } | |
335 | /****************************************************************/ | |
336 | ||
337 | inline | |
338 | Double_t AliAODPair::GetDeltaPx() | |
339 | { | |
340 | //returns difference of Pz | |
341 | CalculateDiffs(); | |
342 | return fPxDiff; | |
343 | } | |
344 | /****************************************************************/ | |
345 | inline | |
346 | Double_t AliAODPair::GetDeltaPy() | |
347 | { | |
348 | //returns difference of Py | |
349 | CalculateDiffs(); | |
350 | return fPyDiff; | |
351 | } | |
352 | ||
353 | /****************************************************************/ | |
354 | inline | |
355 | Double_t AliAODPair::GetDeltaPz() | |
356 | { | |
357 | //returns difference of Pz | |
358 | CalculateDiffs(); | |
359 | return fPzDiff; | |
360 | } | |
361 | /****************************************************************/ | |
362 | ||
363 | inline | |
364 | Double_t AliAODPair::GetDeltaPhi() | |
365 | { | |
366 | //returns difference of Phi | |
367 | Double_t phi1 = fPart1->Phi(); | |
368 | Double_t phi2 = fPart2->Phi(); | |
369 | Double_t diff = phi1-phi2; | |
370 | if (TMath::Abs(diff) > TMath::Pi()) | |
371 | { | |
372 | if (phi1 > TMath::Pi()) | |
373 | { | |
374 | phi1-=TMath::TwoPi(); | |
375 | } | |
376 | else | |
377 | { | |
378 | phi2-=TMath::TwoPi(); | |
379 | } | |
380 | diff = phi1-phi2; | |
381 | } | |
382 | return diff; | |
383 | } | |
384 | /****************************************************************/ | |
385 | ||
386 | inline | |
387 | Double_t AliAODPair::GetDeltaTheta() | |
388 | { | |
389 | //returns difference of Theta | |
390 | return fPart1->Theta()-fPart2->Theta(); | |
391 | } | |
392 | /****************************************************************/ | |
393 | ||
394 | ||
395 | #endif |