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866d8d78 | 1 | // AliAODDimuon: a class for AODs for the MUON Arm of the ALICE Experiment |
2 | // Author: P. Cortese, Universita' del Piemonte Orientale in Alessandria and | |
3 | // INFN of Torino - Italy | |
4 | // | |
5 | // The class defines a dimuon pair object from two AliAODTrack objects. | |
6 | // AliAODDimuon objects are supposed to be added to the AliAODEvent structure | |
7 | // during analysis. They would then allow to calculate the dimuon-related | |
8 | // kinematic variables with a minimal disk occupancy. | |
9 | // The payload of the class has been reduced to two pointers to the two | |
10 | // tracks. An instance of this class has also to be added to the AliAODEvent | |
11 | // structure to provide additional information that is specific to MUON and | |
12 | // therefore has not been included into the AOD header. | |
13 | // Two transient data members are not stored on file as they can be recomputed | |
14 | // at runtime. | |
15 | // | |
16 | ||
17 | #include "AliAODDimuon.h" | |
18 | #include "TLorentzVector.h" | |
19 | #define AliAODDimuon_CXX | |
20 | ||
21 | ClassImp(AliAODDimuon) | |
22 | ||
23 | //______________________________________________________________________________ | |
24 | AliAODDimuon::AliAODDimuon():AliVParticle(),fP(0),fMProton(0.93827231) | |
25 | { | |
26 | // default constructor | |
27 | fMu[0]=0; | |
28 | fMu[1]=0; | |
29 | } | |
30 | ||
31 | //______________________________________________________________________________ | |
32 | AliAODDimuon::AliAODDimuon(const AliAODDimuon& dimu): | |
33 | AliVParticle(dimu), | |
34 | fP(0),fMProton(0.93827231) | |
35 | { | |
36 | // copy constructor | |
37 | fMu[0]=dimu.Mu(0); | |
38 | fMu[1]=dimu.Mu(1); | |
39 | } | |
40 | ||
41 | //______________________________________________________________________________ | |
42 | AliAODDimuon &AliAODDimuon::operator=(const AliAODDimuon& dimu) | |
43 | { | |
44 | // assignment operator | |
45 | if(&dimu != this){ | |
46 | fP=0; | |
47 | fMProton=0.93827231; | |
48 | fMu[0]=dimu.Mu(0); | |
49 | fMu[1]=dimu.Mu(1); | |
50 | } | |
51 | return *this; | |
52 | } | |
53 | ||
54 | //______________________________________________________________________________ | |
55 | AliAODDimuon::AliAODDimuon(TObject *mu0, TObject *mu1): | |
56 | fP(0),fMProton(0.93827231) | |
57 | { | |
58 | // Creates a dimuon pair from two tracks | |
8f6e7d10 | 59 | |
866d8d78 | 60 | fMu[0]=mu0; |
61 | fMu[1]=mu1; | |
62 | } | |
63 | ||
64 | //______________________________________________________________________________ | |
65 | AliAODDimuon::~AliAODDimuon() | |
66 | { | |
67 | // destructor | |
68 | if(fP)delete fP; | |
69 | fP=0; | |
70 | } | |
71 | ||
72 | //______________________________________________________________________________ | |
73 | void AliAODDimuon::BookP(){ | |
8f6e7d10 | 74 | // |
75 | // build the TLorentz vector | |
76 | // | |
866d8d78 | 77 | fP=new TLorentzVector(Px(),Py(),Pz(),E()); |
866d8d78 | 78 | fP->SetPxPyPzE(Px(),Py(),Pz(),E()); |
866d8d78 | 79 | } |
80 | ||
81 | //______________________________________________________________________________ | |
82 | Double_t AliAODDimuon::Px() const { | |
83 | // Px of the dimuon | |
84 | if(this->CheckPointers())return -999999999; | |
85 | return ((AliAODTrack*)fMu[0].GetObject())->Px()+ | |
86 | ((AliAODTrack*)fMu[1].GetObject())->Px(); | |
87 | } | |
88 | ||
89 | //______________________________________________________________________________ | |
90 | Double_t AliAODDimuon::Py() const { | |
91 | // Py of the dimuon | |
92 | if(this->CheckPointers())return -999999999; | |
93 | return ((AliAODTrack*)fMu[0].GetObject())->Py()+ | |
94 | ((AliAODTrack*)fMu[1].GetObject())->Py(); | |
95 | } | |
96 | ||
97 | //______________________________________________________________________________ | |
98 | Double_t AliAODDimuon::Pz() const { | |
99 | // Pz of the dimuon | |
100 | if(this->CheckPointers())return -999999999; | |
101 | return ((AliAODTrack*)fMu[0].GetObject())->Pz()+ | |
102 | ((AliAODTrack*)fMu[1].GetObject())->Pz(); | |
103 | } | |
104 | ||
105 | //______________________________________________________________________________ | |
106 | Double_t AliAODDimuon::Pt() const { | |
107 | // Pt of the dimuon | |
108 | if(this->CheckPointers())return -999999999; | |
109 | Double_t px=Px(); | |
110 | Double_t py=Py(); | |
111 | return TMath::Sqrt(px*px+py*py); | |
112 | return -999999999; | |
113 | } | |
114 | ||
115 | //______________________________________________________________________________ | |
116 | Double_t AliAODDimuon::E() const { | |
117 | // Dimuon energy | |
118 | if(this->CheckPointers())return -999999999; | |
119 | return ((AliAODTrack*)fMu[0].GetObject())->E()+ | |
120 | ((AliAODTrack*)fMu[1].GetObject())->E(); | |
121 | } | |
122 | ||
123 | //______________________________________________________________________________ | |
124 | Double_t AliAODDimuon::P() const { | |
125 | // This is just to override the virtual function | |
126 | printf("You should never call: Double_t AliAODDimuon::P() const\n"); | |
127 | return -999999999; | |
128 | } | |
129 | ||
130 | //______________________________________________________________________________ | |
131 | Double_t AliAODDimuon::P() { | |
132 | // Dimuon momentum | |
133 | if(this->CheckPointers())return -999999999; | |
134 | BookP(); | |
135 | return fP->P(); | |
136 | } | |
137 | ||
138 | //______________________________________________________________________________ | |
139 | Double_t AliAODDimuon::M() const { | |
140 | // This is just to override the virtual function | |
141 | printf("You should never call: Double_t AliAODDimuon::M() const\n"); | |
142 | return -999999999; | |
143 | } | |
144 | ||
145 | //______________________________________________________________________________ | |
146 | Double_t AliAODDimuon::M() { | |
147 | // Dimuon invariant mass | |
148 | if(this->CheckPointers())return -999999999; | |
149 | BookP(); | |
150 | return fP->M(); | |
151 | } | |
152 | ||
153 | //______________________________________________________________________________ | |
154 | Double_t AliAODDimuon::Mass() { | |
155 | // Dimuon invariant mass | |
156 | if(this->CheckPointers())return -999999999; | |
157 | BookP(); | |
158 | return fP->M(); | |
159 | } | |
160 | ||
161 | //______________________________________________________________________________ | |
162 | Double_t AliAODDimuon::Eta() const { | |
163 | // This is just to override the virtual function | |
164 | printf("You should never call: Double_t AliAODDimuon::Eta() const\n"); | |
165 | return -999999999; | |
166 | } | |
167 | ||
168 | //______________________________________________________________________________ | |
169 | Double_t AliAODDimuon::Eta() { | |
170 | // Dimuon pseudorapidity | |
171 | if(this->CheckPointers())return -999999999; | |
172 | BookP(); | |
173 | return fP->Eta(); | |
174 | } | |
175 | ||
176 | //______________________________________________________________________________ | |
177 | Double_t AliAODDimuon::Phi() const { | |
178 | // This is just to override the virtual function | |
179 | printf("You should never call: Double_t AliAODDimuon::Phi() const\n"); | |
180 | return -999999999; | |
181 | } | |
182 | ||
183 | //______________________________________________________________________________ | |
184 | Double_t AliAODDimuon::Phi() { | |
185 | // Dimuon asimuthal angle | |
186 | if(this->CheckPointers())return -999999999; | |
187 | BookP(); | |
188 | return fP->Phi(); | |
189 | } | |
190 | //______________________________________________________________________________ | |
191 | Double_t AliAODDimuon::Theta() const { | |
192 | // This is just to override the virtual function | |
193 | printf("You should never call: Double_t AliAODDimuon::Theta() const\n"); | |
194 | return -999999999; | |
195 | } | |
196 | ||
197 | //______________________________________________________________________________ | |
198 | Double_t AliAODDimuon::Theta() { | |
199 | // Dimuon polar angle | |
200 | if(this->CheckPointers())return -999999999; | |
201 | BookP(); | |
202 | return fP->Theta(); | |
203 | } | |
204 | ||
205 | //______________________________________________________________________________ | |
206 | Double_t AliAODDimuon::Y() const { | |
207 | // This is just to override the virtual function | |
208 | printf("You should never call: Double_t AliAODDimuon::Y() const\n"); | |
209 | return -999999999; | |
210 | } | |
211 | ||
212 | //______________________________________________________________________________ | |
213 | Double_t AliAODDimuon::Y() { | |
214 | // Dimuon rapidity | |
215 | if(this->CheckPointers())return -999999999; | |
216 | BookP(); | |
217 | return fP->Rapidity(); | |
218 | } | |
219 | ||
220 | //______________________________________________________________________________ | |
221 | Short_t AliAODDimuon::Charge() const { | |
222 | // Dimuon charge | |
223 | if(this->CheckPointers())return -999; | |
224 | return ((AliAODTrack*)fMu[0].GetObject())->Charge()+ | |
225 | ((AliAODTrack*)fMu[1].GetObject())->Charge(); | |
226 | } | |
227 | ||
228 | //______________________________________________________________________________ | |
229 | Int_t AliAODDimuon::CheckPointers() const{ | |
230 | // Checks if the track pointers have been initialized | |
231 | if(fMu[0]==0||fMu[1]==0){ | |
232 | printf("Dimuon not initialized\n"); | |
233 | return -999; | |
234 | } | |
235 | if((fMu[0].GetObject())==0||(fMu[1].GetObject())==0){ | |
48453d08 | 236 | printf("Can not get objects\n"); |
866d8d78 | 237 | return -999; |
238 | } | |
239 | return 0; | |
240 | } | |
241 | ||
242 | //______________________________________________________________________________ | |
243 | void AliAODDimuon::SetMu(Int_t imu, AliAODTrack *mu){ | |
244 | // Assign a track pointer | |
245 | if (imu==0||imu==1){ | |
246 | fMu[imu]=mu; | |
247 | } | |
248 | } | |
249 | ||
250 | //______________________________________________________________________________ | |
251 | void AliAODDimuon::SetMuons(AliAODTrack *mu0, AliAODTrack *mu1){ | |
252 | // Assign the track pointers | |
253 | fMu[0]=mu0; | |
254 | fMu[1]=mu1; | |
255 | } | |
256 | ||
257 | //______________________________________________________________________________ | |
258 | Double_t AliAODDimuon::XF() { | |
259 | // Dimuon Feynman x | |
260 | //Double_t ebeam=((AliAODEventInfo*)fEi.GetObject())->EBeam(); | |
261 | Double_t ebeam = 3500.; // temporary | |
262 | if(ebeam<=0){ | |
263 | printf("AliAODDimuon::xf: can not compute xf with EBeam=%f\n",ebeam); | |
264 | return -999999999; | |
265 | } | |
266 | if(this->CheckPointers())return -999999999; | |
267 | BookP(); | |
268 | Double_t mDimu=M(); | |
269 | Double_t pMax=TMath::Sqrt(ebeam*ebeam-mDimu*mDimu); | |
270 | return Pz()/pMax; | |
271 | } | |
272 | ||
273 | //______________________________________________________________________________ | |
866d8d78 | 274 | Double_t AliAODDimuon::CostCS(){ |
48453d08 | 275 | // Calculation the Collins-Soper angle (adapted from code by R. Arnaldi) |
866d8d78 | 276 | if(CheckPointers())return -999999999; |
277 | Double_t ebeam=3500.; //temporary | |
278 | if(ebeam<=0){ | |
279 | printf("Can not compute costCS with EBeam=%f\n",ebeam); | |
280 | return -999999999; | |
281 | } | |
282 | Double_t mp=fMProton; | |
283 | Double_t pbeam=TMath::Sqrt(ebeam*ebeam-mp*mp); | |
284 | Double_t pla10=((AliAODTrack*)fMu[0].GetObject())->Px(); | |
285 | Double_t pla11=((AliAODTrack*)fMu[0].GetObject())->Py(); | |
286 | Double_t pla12=((AliAODTrack*)fMu[0].GetObject())->Pz(); | |
287 | Double_t e1=((AliAODTrack*)fMu[0].GetObject())->E(); | |
288 | Double_t mu1Charge=((AliAODTrack*)fMu[0].GetObject())->Charge(); | |
289 | Double_t pla20=((AliAODTrack*)fMu[1].GetObject())->Px(); | |
290 | Double_t pla21=((AliAODTrack*)fMu[1].GetObject())->Py(); | |
291 | Double_t pla22=((AliAODTrack*)fMu[1].GetObject())->Pz(); | |
292 | Double_t e2=((AliAODTrack*)fMu[1].GetObject())->E(); | |
293 | Double_t mu2Charge=((AliAODTrack*)fMu[1].GetObject())->Charge(); | |
294 | ||
295 | // Fill the Lorentz vector for projectile and target | |
296 | // For the moment we do not consider the crossing angle | |
297 | // Projectile runs towards the MUON arm | |
48453d08 | 298 | TLorentzVector pProjCM(0.,0.,-pbeam,ebeam); // projectile |
299 | TLorentzVector pTargCM(0.,0., pbeam,ebeam); // target | |
866d8d78 | 300 | // |
48453d08 | 301 | // --- Get the muons parameters in the CM frame |
866d8d78 | 302 | // |
48453d08 | 303 | TLorentzVector pMu1CM(pla10,pla11,pla12,e1); |
304 | TLorentzVector pMu2CM(pla20,pla21,pla22,e2); | |
866d8d78 | 305 | // |
48453d08 | 306 | // --- Obtain the dimuon parameters in the CM frame |
866d8d78 | 307 | // |
48453d08 | 308 | TLorentzVector pDimuCM=pMu1CM+pMu2CM; |
866d8d78 | 309 | // |
310 | // --- Translate the dimuon parameters in the dimuon rest frame | |
311 | // | |
48453d08 | 312 | TVector3 beta=(-1./pDimuCM.E())*pDimuCM.Vect(); |
313 | TLorentzVector pMu1Dimu=pMu1CM; | |
314 | TLorentzVector pMu2Dimu=pMu2CM; | |
315 | TLorentzVector pProjDimu=pProjCM; | |
316 | TLorentzVector pTargDimu=pTargCM; | |
866d8d78 | 317 | pMu1Dimu.Boost(beta); |
318 | pMu2Dimu.Boost(beta); | |
319 | pProjDimu.Boost(beta); | |
320 | pTargDimu.Boost(beta); | |
321 | // | |
322 | // --- Determine the z axis for the CS angle | |
323 | // | |
324 | TVector3 zaxisCS=(((pProjDimu.Vect()).Unit())-((pTargDimu.Vect()).Unit())).Unit(); | |
325 | // | |
326 | // --- Determine the CS angle (angle between mu+ and the z axis defined above) | |
327 | // | |
328 | Double_t cost; | |
329 | if(mu1Charge > 0) { | |
330 | cost = zaxisCS.Dot((pMu1Dimu.Vect()).Unit()); | |
331 | // Theta CS is not properly defined for Like-Sign muons | |
332 | if(mu2Charge > 0 && cost<0) cost=-cost; | |
333 | } else { | |
334 | // Theta CS is not properly defined for Like-Sign muons | |
335 | cost = zaxisCS.Dot((pMu2Dimu.Vect()).Unit()); | |
336 | if(mu2Charge < 0 && cost<0) cost=-cost; | |
337 | } | |
338 | return cost; | |
339 | } | |
340 | ||
341 | //______________________________________________________________________________ | |
866d8d78 | 342 | Double_t AliAODDimuon::CostHe(){ |
48453d08 | 343 | // Calculation the Helicity polarization angle (adapted from code by R. Arnaldi) |
866d8d78 | 344 | if(CheckPointers())return -999999999; |
345 | Double_t ebeam=3500; //temporary | |
346 | if(ebeam<=0){ | |
347 | printf("Can not compute costCS with EBeam=%f\n",ebeam); | |
348 | return -999999999; | |
349 | } | |
866d8d78 | 350 | Double_t pla10=((AliAODTrack*)fMu[0].GetObject())->Px(); |
351 | Double_t pla11=((AliAODTrack*)fMu[0].GetObject())->Py(); | |
352 | Double_t pla12=((AliAODTrack*)fMu[0].GetObject())->Pz(); | |
353 | Double_t e1=((AliAODTrack*)fMu[0].GetObject())->E(); | |
354 | Double_t mu1Charge=((AliAODTrack*)fMu[0].GetObject())->Charge(); | |
355 | Double_t pla20=((AliAODTrack*)fMu[1].GetObject())->Px(); | |
356 | Double_t pla21=((AliAODTrack*)fMu[1].GetObject())->Py(); | |
357 | Double_t pla22=((AliAODTrack*)fMu[1].GetObject())->Pz(); | |
358 | Double_t e2=((AliAODTrack*)fMu[1].GetObject())->E(); | |
359 | Double_t mu2Charge=((AliAODTrack*)fMu[1].GetObject())->Charge(); | |
866d8d78 | 360 | // |
48453d08 | 361 | // --- Get the muons parameters in the CM frame |
866d8d78 | 362 | // |
48453d08 | 363 | TLorentzVector pMu1CM(pla10,pla11,pla12,e1); |
364 | TLorentzVector pMu2CM(pla20,pla21,pla22,e2); | |
866d8d78 | 365 | // |
48453d08 | 366 | // --- Obtain the dimuon parameters in the CM frame |
866d8d78 | 367 | // |
48453d08 | 368 | TLorentzVector pDimuCM=pMu1CM+pMu2CM; |
866d8d78 | 369 | // |
370 | // --- Translate the dimuon parameters in the dimuon rest frame | |
371 | // | |
48453d08 | 372 | TVector3 beta=(-1./pDimuCM.E())*pDimuCM.Vect(); |
373 | TLorentzVector pMu1Dimu=pMu1CM; | |
374 | TLorentzVector pMu2Dimu=pMu2CM; | |
866d8d78 | 375 | pMu1Dimu.Boost(beta); |
376 | pMu2Dimu.Boost(beta); | |
377 | // | |
866d8d78 | 378 | // --- Determine the z axis for the calculation of the polarization angle |
379 | // (i.e. the direction of the dimuon in the CM system) | |
380 | // | |
381 | TVector3 zaxis; | |
382 | zaxis=(pDimuCM.Vect()).Unit(); | |
383 | // | |
384 | // --- Calculation of the polarization angle (Helicity) | |
385 | // (angle between mu+ and the z axis defined above) | |
386 | // | |
387 | Double_t cost; | |
388 | if(mu1Charge > 0) { | |
389 | cost = zaxis.Dot((pMu1Dimu.Vect()).Unit()); | |
390 | // Theta Helicity is not properly defined for Like-Sign muons | |
391 | if(mu2Charge > 0 && cost<0) cost=-cost; | |
392 | } else { | |
393 | cost = zaxis.Dot((pMu2Dimu.Vect()).Unit()); | |
394 | // Theta Helicity is not properly defined for Like-Sign muons | |
395 | if(mu2Charge < 0 && cost<0) cost=-cost; | |
396 | } | |
397 | return cost; | |
398 | } | |
399 | ||
48453d08 | 400 | //________________________________________________________________________ |
401 | Double_t AliAODDimuon::PhiCS(){ | |
402 | // Cosinus of the Collins-Soper polar decay angle | |
403 | if(CheckPointers())return -999999999; | |
404 | Double_t ebeam=3500.; //temporary | |
405 | if(ebeam<=0){ | |
406 | printf("Can not compute phiCS with EBeam=%f\n",ebeam); | |
407 | return -999999999; | |
408 | } | |
409 | Double_t mp=fMProton; | |
410 | Double_t pbeam=TMath::Sqrt(ebeam*ebeam-mp*mp); | |
411 | Double_t pla10=((AliAODTrack*)fMu[0].GetObject())->Px(); | |
412 | Double_t pla11=((AliAODTrack*)fMu[0].GetObject())->Py(); | |
413 | Double_t pla12=((AliAODTrack*)fMu[0].GetObject())->Pz(); | |
414 | Double_t e1=((AliAODTrack*)fMu[0].GetObject())->E(); | |
415 | Double_t mu1Charge=((AliAODTrack*)fMu[0].GetObject())->Charge(); | |
416 | Double_t pla20=((AliAODTrack*)fMu[1].GetObject())->Px(); | |
417 | Double_t pla21=((AliAODTrack*)fMu[1].GetObject())->Py(); | |
418 | Double_t pla22=((AliAODTrack*)fMu[1].GetObject())->Pz(); | |
419 | Double_t e2=((AliAODTrack*)fMu[1].GetObject())->E(); | |
420 | ||
421 | // Fill the Lorentz vector for projectile and target | |
422 | // For the moment we do not consider the crossing angle | |
423 | // Projectile runs towards the MUON arm | |
424 | TLorentzVector pProjCM(0.,0.,-pbeam,ebeam); // projectile | |
425 | TLorentzVector pTargCM(0.,0., pbeam,ebeam); // target | |
426 | // | |
427 | // --- Get the muons parameters in the CM frame | |
428 | // | |
429 | TLorentzVector pMu1CM(pla10,pla11,pla12,e1); | |
430 | TLorentzVector pMu2CM(pla20,pla21,pla22,e2); | |
431 | // | |
432 | // --- Obtain the dimuon parameters in the CM frame | |
433 | // | |
434 | TLorentzVector pDimuCM=pMu1CM+pMu2CM; | |
435 | // | |
436 | // --- Translate the dimuon parameters in the dimuon rest frame | |
437 | // | |
438 | TVector3 beta=(-1./pDimuCM.E())*pDimuCM.Vect(); | |
439 | TLorentzVector pMu1Dimu=pMu1CM; | |
440 | TLorentzVector pMu2Dimu=pMu2CM; | |
441 | TLorentzVector pProjDimu=pProjCM; | |
442 | TLorentzVector pTargDimu=pTargCM; | |
443 | pMu1Dimu.Boost(beta); | |
444 | pMu2Dimu.Boost(beta); | |
445 | pProjDimu.Boost(beta); | |
446 | pTargDimu.Boost(beta); | |
447 | // | |
448 | // --- Determine the z axis for the CS angle | |
449 | // | |
450 | TVector3 zaxisCS=(((pProjDimu.Vect()).Unit())-((pTargDimu.Vect()).Unit())).Unit(); | |
451 | // | |
452 | // --- Determine the CS angle (angle between mu+ and the z axis defined above) | |
453 | // | |
454 | TVector3 yaxisCS=(((pProjDimu.Vect()).Unit()).Cross((pTargDimu.Vect()).Unit())).Unit(); | |
455 | TVector3 xaxisCS=(yaxisCS.Cross(zaxisCS)).Unit(); | |
456 | ||
457 | Double_t phi; | |
458 | if(mu1Charge>0) phi = TMath::ATan2((pMu1Dimu.Vect()).Dot(yaxisCS),((pMu1Dimu.Vect()).Dot(xaxisCS))); | |
459 | else phi = TMath::ATan2((pMu2Dimu.Vect()).Dot(yaxisCS),((pMu2Dimu.Vect()).Dot(xaxisCS))); | |
460 | ||
461 | return phi; | |
462 | } | |
463 | ||
464 | //______________________________________________________________________________ | |
465 | Double_t AliAODDimuon::PhiHe(){ | |
466 | // Calculation the Helicity aimuthal angle (adapted from code by R. Arnaldi) | |
467 | if(CheckPointers())return -999999999; | |
468 | Double_t ebeam=3500; //temporary | |
469 | if(ebeam<=0){ | |
470 | printf("Can not compute phiHE with EBeam=%f\n",ebeam); | |
471 | return -999999999; | |
472 | } | |
473 | Double_t pbeam=TMath::Sqrt(ebeam*ebeam-fMProton*fMProton); | |
474 | Double_t pla10=((AliAODTrack*)fMu[0].GetObject())->Px(); | |
475 | Double_t pla11=((AliAODTrack*)fMu[0].GetObject())->Py(); | |
476 | Double_t pla12=((AliAODTrack*)fMu[0].GetObject())->Pz(); | |
477 | Double_t e1=((AliAODTrack*)fMu[0].GetObject())->E(); | |
478 | Double_t mu1Charge=((AliAODTrack*)fMu[0].GetObject())->Charge(); | |
479 | Double_t pla20=((AliAODTrack*)fMu[1].GetObject())->Px(); | |
480 | Double_t pla21=((AliAODTrack*)fMu[1].GetObject())->Py(); | |
481 | Double_t pla22=((AliAODTrack*)fMu[1].GetObject())->Pz(); | |
482 | Double_t e2=((AliAODTrack*)fMu[1].GetObject())->E(); | |
483 | ||
484 | // Fill the Lorentz vector for projectile and target | |
485 | // For the moment we consider no crossing angle | |
486 | // Projectile runs towards the MUON arm | |
487 | TLorentzVector pProjCM(0.,0.,-pbeam,ebeam); // projectile | |
488 | TLorentzVector pTargCM(0.,0., pbeam,ebeam); // target | |
489 | // | |
490 | // --- Get the muons parameters in the CM frame | |
491 | // | |
492 | TLorentzVector pMu1CM(pla10,pla11,pla12,e1); | |
493 | TLorentzVector pMu2CM(pla20,pla21,pla22,e2); | |
494 | // | |
495 | // --- Obtain the dimuon parameters in the CM frame | |
496 | // | |
497 | TLorentzVector pDimuCM=pMu1CM+pMu2CM; | |
498 | // | |
499 | // --- Translate the muon parameters in the dimuon rest frame | |
500 | // | |
501 | TVector3 zaxis=(pDimuCM.Vect()).Unit(); | |
502 | // | |
503 | // --- Translate the dimuon parameters in the dimuon rest frame | |
504 | // | |
505 | TVector3 beta=(-1./pDimuCM.E())*pDimuCM.Vect(); | |
506 | TLorentzVector pMu1Dimu=pMu1CM; | |
507 | TLorentzVector pMu2Dimu=pMu2CM; | |
508 | pMu1Dimu.Boost(beta); | |
509 | pMu2Dimu.Boost(beta); | |
510 | ||
511 | TLorentzVector pProjDimu=pProjCM; | |
512 | TLorentzVector pTargDimu=pTargCM; | |
513 | pProjDimu.Boost(beta); | |
514 | pTargDimu.Boost(beta); | |
515 | ||
516 | TVector3 yaxis=((pProjDimu.Vect()).Cross(pTargDimu.Vect())).Unit(); | |
517 | TVector3 xaxis=(yaxis.Cross(zaxis)).Unit(); | |
518 | // | |
519 | // --- Calculation of the azimuthal angle (Helicity) | |
520 | // | |
521 | Double_t phi; | |
522 | if(mu1Charge>0) phi = TMath::ATan2((pMu1Dimu.Vect()).Dot(yaxis),(pMu1Dimu.Vect()).Dot(xaxis)); | |
523 | else phi = TMath::ATan2((pMu2Dimu.Vect()).Dot(yaxis),(pMu2Dimu.Vect()).Dot(xaxis)); | |
524 | ||
525 | return phi; | |
526 | } | |
527 | ||
866d8d78 | 528 | //______________________________________________________________________________ |
529 | Int_t AliAODDimuon::AnyPt(){ | |
530 | // Test if the two muons match two trigger tracks | |
531 | if(this->CheckPointers())return 0; | |
532 | return (((AliAODTrack*)fMu[0].GetObject())->MatchTrigger())&& | |
8f6c57a4 | 533 | (((AliAODTrack*)fMu[1].GetObject())->MatchTrigger()); |
866d8d78 | 534 | } |
535 | ||
536 | //______________________________________________________________________________ | |
537 | Int_t AliAODDimuon::LowPt(){ | |
538 | // Test if the two muons match two trigger tracks with a "Low Pt" cut | |
539 | if(this->CheckPointers())return 0; | |
540 | return (((AliAODTrack*)fMu[0].GetObject())->MatchTriggerLowPt())&& | |
8f6c57a4 | 541 | (((AliAODTrack*)fMu[1].GetObject())->MatchTriggerLowPt()); |
866d8d78 | 542 | } |
543 | ||
544 | //______________________________________________________________________________ | |
545 | Int_t AliAODDimuon::HighPt(){ | |
546 | // Test if the two muons match two trigger tracks with a "High Pt" cut | |
547 | if(this->CheckPointers())return 0; | |
548 | return (((AliAODTrack*)fMu[0].GetObject())->MatchTriggerHighPt())&& | |
8f6c57a4 | 549 | (((AliAODTrack*)fMu[1].GetObject())->MatchTriggerHighPt()); |
866d8d78 | 550 | } |
551 | ||
552 | //______________________________________________________________________________ | |
553 | Double_t AliAODDimuon::MaxChi2Match(){ | |
554 | // Maximum matching Chi2 between track and trigger track | |
555 | if(this->CheckPointers())return -999999999; | |
556 | return TMath::Max((((AliAODTrack*)fMu[0].GetObject())->GetChi2MatchTrigger()), | |
8f6c57a4 | 557 | (((AliAODTrack*)fMu[1].GetObject())->GetChi2MatchTrigger())); |
866d8d78 | 558 | } |