]>
Commit | Line | Data |
---|---|---|
55fd51b0 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * SigmaEffect_thetadegrees * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpeateose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
18 | //=================================================================== | |
19 | //This class was prepared by INFN Cagliari, July 2006 | |
20 | //(authors: H.Woehri, A.de Falco) | |
21 | // | |
22 | // Compact information for the generated muon pairs in the MUON arm | |
23 | // useful at the last stage of the analysis chain | |
24 | // Pairs are built with two AliMUONTrackLight objects | |
25 | // Using the class AliMUONTrackLight this class combines the decay | |
26 | // information ("history") of the reconstructed tracks and fills | |
27 | // a series of flags for the formed reconstructed dimuon: | |
28 | // fIsCorrelated, fCreationProcess, fIsFeedDown, ... | |
29 | // for information about the dimuon, use PrintInfo with the appropriate | |
30 | // printflag | |
31 | // To be used together with AliMUONTrackLight | |
32 | //=================================================================== | |
33 | ||
34 | ||
35 | //MUON classes | |
36 | #include "AliMUONPairLight.h" | |
37 | //Root classes | |
38 | #include "TString.h" | |
39 | ||
40 | ClassImp(AliMUONPairLight) | |
41 | ||
42 | //==================================== | |
43 | AliMUONPairLight::AliMUONPairLight() : | |
44 | TObject(), | |
45 | fMu0(), | |
46 | fMu1(), | |
47 | fCreationProcess(-999), | |
48 | fIsCorrelated(kFALSE), | |
49 | fCauseOfCorrelation (-1), | |
50 | fIsFeedDown(kFALSE) | |
51 | { | |
52 | /// default constructor | |
53 | ; | |
54 | } | |
55 | ||
56 | //==================================== | |
57 | ||
58 | AliMUONPairLight::AliMUONPairLight(AliMUONPairLight &dimuCopy) | |
59 | : TObject(dimuCopy), | |
60 | fMu0(dimuCopy.fMu0), | |
0060b2f7 | 61 | fMu1(dimuCopy.fMu1), |
55fd51b0 | 62 | fCreationProcess(dimuCopy.fCreationProcess), |
63 | fIsCorrelated(dimuCopy.fIsCorrelated), | |
64 | fCauseOfCorrelation (dimuCopy.fCauseOfCorrelation), | |
65 | fIsFeedDown(dimuCopy.fIsFeedDown) | |
66 | { | |
67 | /// copy constructor | |
68 | /// fMu0 = AliMUONTrackLight(dimuCopy.fMu0); | |
69 | /// fMu1 = AliMUONTrackLight(dimuCopy.fMu1); | |
70 | /// fIsCorrelated = dimuCopy.fIsCorrelated; | |
71 | /// fCauseOfCorrelation = dimuCopy.fCauseOfCorrelation; | |
72 | /// fCreationProcess = dimuCopy.fCreationProcess; | |
73 | /// fIsFeedDown = dimuCopy.fIsFeedDown; | |
74 | ; | |
75 | } | |
76 | ||
77 | //==================================== | |
78 | ||
79 | AliMUONPairLight::~AliMUONPairLight(){ | |
80 | /// destructor | |
81 | } | |
82 | ||
83 | //==================================== | |
84 | ||
85 | Bool_t AliMUONPairLight::IsAResonance(){ | |
86 | /// checks if muon pair comes from a resonance decay | |
87 | if (!fIsCorrelated) return kFALSE; //if muons not correlated, cannot be a resonance | |
88 | //if muons are correlated, check if the PDG of the | |
89 | //common mother is a resonance | |
90 | Int_t pdg = GetCauseOfCorrelation(); | |
91 | if(pdg < 10) return kFALSE; | |
92 | Int_t id=pdg%100000; | |
93 | if(((id-id%10)%110)) return kFALSE; | |
94 | else return kTRUE; | |
95 | printf("<AliMUONPairLight::IsAResonance> arriving after this piece of code\n"); | |
96 | ||
97 | } | |
98 | ||
99 | //==================================== | |
100 | ||
101 | AliMUONTrackLight* AliMUONPairLight::GetMuon(Int_t index) { | |
102 | /// return muon 0 or 1 | |
103 | if (index==0) return &fMu0; | |
104 | else if (index==1) return &fMu1; | |
105 | else{ printf ("Index can be either 0 or 1\n"); return 0;} | |
106 | // else return &fMu1; | |
107 | } | |
108 | ||
109 | //==================================== | |
110 | ||
111 | Int_t AliMUONPairLight::GetMuonMotherPDG(Int_t imuon, Int_t mother) { | |
112 | /// return muon mother pdg code | |
113 | if (imuon==0) return fMu0.GetParentPDGCode(mother); | |
114 | else if (imuon==1) return fMu1.GetParentPDGCode(mother); | |
115 | else { printf ("Index must be only 0 or 1\n"); return -999; } | |
116 | } | |
117 | ||
118 | //==================================== | |
119 | void AliMUONPairLight::SetProcess(){ | |
120 | /// finds the process related to the muon pair (open charm/beauty, resonance, | |
121 | /// uncorrelated...) | |
122 | AliMUONTrackLight *mu1 = &fMu0; | |
123 | AliMUONTrackLight *mu2 = &fMu1; | |
124 | ||
125 | //1.) check if one of the tracks is not a muon | |
126 | if(IsOneTrackNotAMuon()) { | |
127 | this->SetCorrelated(kFALSE); | |
128 | return; | |
129 | } | |
130 | ||
131 | // check if the two muons are correlated | |
132 | // first check if they come from the same hadron (resonance or beauty/charm meson) | |
133 | Int_t npar1 = mu1->GetNParents(); | |
134 | Int_t npar2 = mu2->GetNParents(); | |
135 | // for (Int_t imoth1 = 0; imoth1<npar1; imoth1++) { | |
136 | for (Int_t imoth1 = npar1-1; imoth1>=0; imoth1--) { | |
137 | Int_t lineMo1 = mu1->GetParentPythiaLine(imoth1); | |
138 | // for (Int_t imoth2 = 0; imoth2<npar2; imoth2++) { | |
139 | for (Int_t imoth2 = npar2-1; imoth2>=0; imoth2--) { | |
140 | Int_t lineMo2 = mu2->GetParentPythiaLine(imoth2); | |
141 | if(lineMo1 == lineMo2) { | |
142 | this->SetCorrelated(kTRUE); | |
143 | this->SetCauseOfCorrelation(mu1->GetParentPDGCode(imoth1)); | |
144 | if(!IsAResonance()) fCreationProcess = 3; | |
145 | else fCreationProcess = -1; | |
146 | return; // <<<<---------------- RETURN? | |
147 | } | |
148 | } | |
149 | } | |
150 | ||
151 | // if Open Beauty/Charm we can have 3 creation processes | |
152 | // (pair creation [0], gluon splitting [1] or flavour excitation [2]) | |
153 | // | |
154 | // 1.) gluon splitting: gluon (stored with index 2, id=21) must be the same | |
155 | if (mu1->GetQuarkPythiaLine(2) == mu2->GetQuarkPythiaLine(2) && mu1->GetQuarkPDGCode(2) == 21) { | |
156 | this->SetCorrelated(kTRUE); | |
157 | if(GetCauseOfCorrelation() == -1){ | |
158 | this->SetCauseOfCorrelation(mu1->GetQuarkPDGCode(2)); | |
159 | } | |
160 | fCreationProcess = 1; | |
161 | return; | |
162 | } | |
163 | ||
164 | // 2.) pair creation: if pythia line 6 of one track *and* pythia line 7 of second track | |
165 | // are filled with a Q and Qbar | |
166 | Int_t line1 = mu1->GetQuarkPythiaLine(2); //[2] ... very first quark | |
167 | Int_t line2 = mu2->GetQuarkPythiaLine(2); | |
168 | Int_t flavour1 = TMath::Abs(mu1->GetQuarkPDGCode(2)); //[2] ... very first quark | |
169 | Int_t flavour2 = TMath::Abs(mu2->GetQuarkPDGCode(2)); | |
170 | if ((line1 == 6 || line1 == 7) && (line2 == 6 || line2 == 7)) { | |
171 | if((flavour1 == 4 || flavour1 == 5) && (flavour2 == 4 || flavour2 == 5)){ | |
172 | this->SetCorrelated(kTRUE); | |
173 | fCreationProcess = 0; | |
174 | return; | |
175 | } | |
176 | } | |
177 | ||
178 | // 3.)flavour excitation: | |
179 | if((((line1 == 6 || line1 == 7) && (flavour1 == 4 || flavour1 == 5)) && //first track has Q in line 6 or 7 | |
180 | ((line2 == 2 || line2 == 3) && (flavour2 == 21 || flavour2 < 10))) || //second track has a g/q in line 2 or 3 | |
181 | (((line2 == 6 || line2 == 7) && (flavour2 == 4 || flavour2 == 5)) && //or the same, | |
182 | ((line1 == 2 || line1 == 3) && (flavour1 == 21 || flavour1 < 10)))){ // swapping the track's indices | |
183 | ||
184 | // printf("candidate for flavour excitation\n"); | |
185 | ||
186 | //Hermine: is it needed to check the lines 4-7??? | |
187 | ||
188 | //now, we have a candidate for flavour excitation | |
189 | //we must also verify if in the Pythia listing | |
190 | //the "incoming" lines 4 and 5 and "outgoing" lines 6 and 7 | |
191 | //are filled with g Q each: e.g. 4(g),5(Q),5(g),6(Q) | |
192 | // Int_t pdg4 = TMath::Abs(stack()->Particle(4)->GetPdgCode()); | |
193 | // Int_t pdg5 = TMath::Abs(stack()->Particle(5)->GetPdgCode()); | |
194 | // Int_t pdg6 = TMath::Abs(stack()->Particle(6)->GetPdgCode()); | |
195 | // Int_t pdg7 = TMath::Abs(stack()->Particle(7)->GetPdgCode()); | |
196 | // if((pdg4 == 21 && pdg5 < 10 || pdg5 == 21 && pdg4 < 10 ) && | |
197 | // (pdg6 == 21 && pdg7 < 10 || pdg7 == 21 && pdg6 < 10 )){ | |
198 | // this->PrintInfo("H"); | |
199 | this->SetCorrelated(kTRUE); | |
200 | fCreationProcess = 2; | |
201 | return; | |
202 | // } | |
203 | } | |
204 | } | |
205 | ||
206 | //==================================== | |
207 | void AliMUONPairLight::SetMuons(AliMUONTrackLight mu0, AliMUONTrackLight mu1){ | |
208 | /// set the two muons | |
209 | fMu0 = mu0; | |
210 | fMu1 = mu1; | |
211 | this->SetProcess(); | |
212 | } | |
213 | ||
214 | //==================================== | |
215 | void AliMUONPairLight::PrintInfo(Option_t* opt){ | |
216 | /// print information about muon pairs | |
217 | /// Options: | |
218 | /// - "H" single muons' decay histories | |
219 | /// - "K" dimuon kinematics | |
220 | /// - "F" dimuon flags | |
221 | /// - "A" all variables | |
222 | TString options(opt); | |
223 | options.ToUpper(); | |
224 | ||
225 | if(options.Contains("H") || options.Contains("A")){//muon decay histories | |
226 | ||
227 | AliMUONTrackLight *mu1 = &fMu0; | |
228 | AliMUONTrackLight *mu2 = &fMu1; | |
229 | ||
230 | printf("========= History =======================\n"); | |
231 | printf("first muon"); | |
232 | mu1->PrintInfo("H"); | |
233 | printf("second muon"); | |
234 | mu2->PrintInfo("H"); | |
235 | printf("=========================================\n"); | |
236 | } | |
237 | if(options.Contains("F") || options.Contains("A")){//flags | |
238 | printf("the flags set for this muon pair are:\n"); | |
239 | printf("=====================================\n"); | |
240 | if(this->IsOneTrackNotAMuon()) printf("(*) one rec. track is not a muon\n"); | |
241 | fIsCorrelated ? printf("(*) it is a correlated pair\n") : printf("(*) it is not a correlated pair\n"); | |
242 | if(IsOpenCharm()) printf("(*) correlated open charm: "); | |
243 | if(IsOpenBeauty()) printf("(*) correlated open beauty: "); | |
244 | if(IsOpenCharm() || IsOpenBeauty()){ | |
245 | switch(fCreationProcess){ | |
246 | case 0: | |
247 | printf("pair creation"); | |
248 | break; | |
249 | case 1: | |
250 | printf("gluon splitting"); | |
251 | break; | |
252 | case 2: | |
253 | printf("flavour excitation"); | |
254 | break; | |
255 | case 3: | |
256 | printf("both muons come from same fragmented mother"); | |
257 | break; | |
258 | } | |
259 | if(this->GetMuon(0)->GetOscillation() || this->GetMuon(1)->GetOscillation()) | |
260 | printf("... where oscillation occured\n"); | |
261 | else{ | |
262 | if(IsOpenBeauty()) | |
263 | printf(" (no oscillation)\n"); | |
264 | else | |
265 | printf("\n"); | |
266 | } | |
267 | } | |
268 | IsAResonance() ? printf("(*) it is a resonance: %d\n", this->GetMuonMotherPDG(fIsFeedDown)) : printf("(*) it is not a resonance\n"); | |
269 | fIsFeedDown ? printf("(*) mother has feed-down: %d --> %d\n", this->GetMuonMotherPDG(1), this->GetMuonMotherPDG(0)) : printf("(*) no feed-down\n"); | |
270 | printf("=====================================\n"); | |
271 | } | |
272 | if(options.Contains("K") || options.Contains("A")){//dimuon kinematics | |
273 | Double_t *vtx = this->GetMuon(0)->GetVertex(); | |
274 | TLorentzVector momRec = this->GetPRec(); | |
275 | TLorentzVector momGen = this->GetPGen(); | |
276 | printf("the dimuon charge is %d\n", this->GetCharge()); | |
277 | printf("primary Vertex: Vx = %1.3f, Vy = %1.3f, Vz = %1.3f\n", vtx[0], vtx[1], vtx[2]); | |
278 | printf("Generated: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momGen.Px(), momGen.Py(), momGen.Pz()); | |
279 | printf("Reconstructed: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momRec.Px(), momRec.Py(), momRec.Pz()); | |
280 | //rapidity, pT, angles, ... | |
281 | printf("Rec. variables: pT %1.3f, pseudo-rapidity %1.3f, openingAngle %1.3f (%1.3f degree), theta %1.3f (%1.3f degree), phi %1.3f (%1.3f degree)\n", | |
282 | momRec.Pt(), momRec.Eta(), | |
283 | TMath::Pi()/180.*this->GetOpeningAngle(), this->GetOpeningAngle(), | |
284 | momRec.Theta(), 180./TMath::Pi() * momRec.Theta(), | |
285 | momRec.Phi(), 180./TMath::Pi() * momRec.Phi()); | |
286 | } | |
287 | } | |
288 | ||
289 | Double_t AliMUONPairLight::GetOpeningAngle() { | |
290 | // opening angle between the two muons in the lab frame (in degrees) | |
291 | TLorentzVector pRecMu0 = fMu0.GetPRec(); | |
292 | TLorentzVector pRecMu1 = fMu1.GetPRec(); | |
293 | TVector3 pRecMu03 = pRecMu0.Vect(); | |
294 | TVector3 pRecMu13 = pRecMu1.Vect(); | |
295 | Double_t scalar = pRecMu03.Dot(pRecMu13); | |
296 | Double_t modMu0 = pRecMu03.Mag(); | |
297 | Double_t modMu1 = pRecMu13.Mag(); | |
298 | Double_t theta = (TMath::ACos(scalar/(modMu0*modMu1)))*(180./TMath::Pi()); | |
299 | return theta; | |
300 | } |