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