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1 | // | |
2 | // | |
3 | // | |
4 | // | |
5 | #include "DimuonCombinator.h" | |
6 | #include "AliRun.h" | |
7 | #include "TRandom.h" | |
8 | // | |
9 | ClassImp(DimuonCombinator) | |
10 | // | |
11 | // Iterators | |
12 | // | |
13 | GParticle* DimuonCombinator::FirstMuon() | |
14 | { | |
15 | fimuon1=fimin1; | |
16 | fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1); | |
17 | while(Type(fmuon1)!=5 && Type(fmuon1)!=6) { | |
18 | fimuon1++; | |
19 | if (fimuon1 >= fimax1) {fmuon1=0; break;} | |
20 | fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1); | |
21 | } | |
22 | return fmuon1; | |
23 | } | |
24 | ||
25 | GParticle* DimuonCombinator::FirstMuonSelected() | |
26 | { | |
27 | GParticle * muon=FirstMuon(); | |
28 | while(muon!=0 && !Selected(muon)) {muon=NextMuon();} | |
29 | return muon; | |
30 | } | |
31 | ||
32 | ||
33 | GParticle* DimuonCombinator::NextMuon() | |
34 | { | |
35 | fimuon1++; | |
36 | if (fimuon1>=fNParticle) {fmuon1 = 0; return fmuon1;} | |
37 | ||
38 | fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1); | |
39 | while(Type(fmuon1)!=5 && Type(fmuon1)!=6) { | |
40 | fimuon1++; | |
41 | if (fimuon1>=fimax1) {fmuon1 = 0; break;} | |
42 | fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1); | |
43 | } | |
44 | return fmuon1; | |
45 | } | |
46 | ||
47 | GParticle* DimuonCombinator::NextMuonSelected() | |
48 | { | |
49 | GParticle * muon=NextMuon(); | |
50 | while(muon !=0 && !Selected(muon)) {muon=NextMuon();} | |
51 | return muon; | |
52 | } | |
53 | ||
54 | ||
55 | void DimuonCombinator::FirstPartner() | |
56 | { | |
57 | if (fimin1==fimin2) { | |
58 | fimuon2=fimuon1+1; | |
59 | } else { | |
60 | fimuon2=fimin2; | |
61 | } | |
62 | if (fimuon2 >= fimax2) {fmuon2=0; return;} | |
63 | fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2); | |
64 | while(Type(fmuon2)!=5 && Type(fmuon2)!=6) { | |
65 | fimuon2++; | |
66 | if (fimuon2 >= fimax2) {fmuon2=0; break;} | |
67 | fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2); | |
68 | } | |
69 | } | |
70 | void DimuonCombinator::FirstPartnerSelected() | |
71 | { | |
72 | FirstPartner(); | |
73 | while(fmuon2 !=0 && !Selected(fmuon2)) {NextPartner();} | |
74 | } | |
75 | ||
76 | ||
77 | void DimuonCombinator::NextPartner() | |
78 | { | |
79 | fimuon2++; | |
80 | if (fimuon2>=fimax2) {fmuon2 = 0; return;} | |
81 | ||
82 | ||
83 | fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2); | |
84 | ||
85 | while(Type(fmuon2)!=5 && Type(fmuon2)!=6) { | |
86 | fimuon2++; | |
87 | if (fimuon2>=fimax2) {fmuon2 = 0; break;} | |
88 | fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2); | |
89 | } | |
90 | ||
91 | } | |
92 | ||
93 | void DimuonCombinator::NextPartnerSelected() | |
94 | { | |
95 | NextPartner(); | |
96 | while(fmuon2 !=0 && !Selected(fmuon2)) {NextPartner();} | |
97 | } | |
98 | ||
99 | ||
100 | GParticle* DimuonCombinator::Partner() | |
101 | { | |
102 | return fmuon2; | |
103 | } | |
104 | ||
105 | void DimuonCombinator::FirstMuonPair(GParticle* & muon1, GParticle* & muon2) | |
106 | { | |
107 | FirstMuon(); | |
108 | FirstPartner(); | |
109 | muon1=fmuon1; | |
110 | muon2=fmuon2; | |
111 | } | |
112 | void DimuonCombinator::NextMuonPair(GParticle* & muon1, GParticle* & muon2) | |
113 | { | |
114 | NextPartner(); | |
115 | if (!Partner()) { | |
116 | NextMuon(); | |
117 | FirstPartner(); | |
118 | } | |
119 | muon1=fmuon1; | |
120 | muon2=fmuon2; | |
121 | } | |
122 | void DimuonCombinator::FirstMuonPairSelected(GParticle* & muon1, GParticle* & muon2) | |
123 | { | |
124 | FirstMuonSelected(); | |
125 | FirstPartnerSelected(); | |
126 | muon1=fmuon1; | |
127 | muon2=fmuon2; | |
128 | } | |
129 | void DimuonCombinator::NextMuonPairSelected(GParticle* & muon1, GParticle* & muon2) | |
130 | { | |
131 | NextPartnerSelected(); | |
132 | if (!Partner()) { | |
133 | NextMuonSelected(); | |
134 | FirstPartnerSelected(); | |
135 | } | |
136 | muon1=fmuon1; | |
137 | muon2=fmuon2; | |
138 | } | |
139 | void DimuonCombinator::ResetRange() | |
140 | { | |
141 | fimin1=fimin2=0; | |
142 | fimax1=fimax2=fNParticle; | |
143 | } | |
144 | ||
145 | void DimuonCombinator::SetFirstRange(Int_t from, Int_t to) | |
146 | { | |
147 | fimin1=from; | |
148 | fimax1=to; | |
149 | if (fimax1 > fNParticle) fimax1=fNParticle; | |
150 | } | |
151 | ||
152 | void DimuonCombinator::SetSecondRange(Int_t from, Int_t to) | |
153 | { | |
154 | fimin2=from; | |
155 | fimax2=to; | |
156 | if (fimax2 > fNParticle) fimax2=fNParticle; | |
157 | } | |
158 | // | |
159 | // Selection | |
160 | // | |
161 | ||
162 | Bool_t DimuonCombinator::Selected(GParticle* part) | |
163 | { | |
164 | // | |
165 | // | |
166 | if (part==0) {return 0;} | |
167 | ||
168 | if (part->GetPT() > fPtMin && part->GetEta()>fEtaMin && part->GetEta()<fEtaMax) { | |
169 | return 1; | |
170 | } else { | |
171 | return 0; | |
172 | } | |
173 | ||
174 | ||
175 | } | |
176 | ||
177 | Bool_t DimuonCombinator::Selected(GParticle* part1, GParticle* part2) | |
178 | { | |
179 | return Selected(part1)*Selected(part2); | |
180 | } | |
181 | // | |
182 | // Kinematics | |
183 | // | |
184 | Float_t DimuonCombinator::Mass(GParticle* part1, GParticle* part2) | |
185 | { | |
186 | Float_t px,py,pz,e; | |
187 | px=part1->GetPx()+part2->GetPx(); | |
188 | py=part1->GetPy()+part2->GetPy(); | |
189 | pz=part1->GetPz()+part2->GetPz(); | |
190 | e =part1->GetEnergy()+part2->GetEnergy(); | |
191 | Float_t p=px*px+py*py+pz*pz; | |
192 | if (e*e < p) { | |
193 | return -1; | |
194 | } else { | |
195 | return TMath::Sqrt(e*e-p); | |
196 | } | |
197 | } | |
198 | ||
199 | Float_t DimuonCombinator::PT(GParticle* part1, GParticle* part2) | |
200 | { | |
201 | Float_t px,py; | |
202 | px=part1->GetPx()+part2->GetPx(); | |
203 | py=part1->GetPy()+part2->GetPy(); | |
204 | return TMath::Sqrt(px*px+py*py); | |
205 | } | |
206 | ||
207 | Float_t DimuonCombinator::Pz(GParticle* part1, GParticle* part2) | |
208 | { | |
209 | return part1->GetPz()+part2->GetPz(); | |
210 | } | |
211 | ||
212 | Float_t DimuonCombinator::Y(GParticle* part1, GParticle* part2) | |
213 | { | |
214 | Float_t pz,e; | |
215 | pz=part1->GetPz()+part2->GetPz(); | |
216 | e =part1->GetEnergy()+part2->GetEnergy(); | |
217 | return 0.5*TMath::Log((e+pz)/(e-pz)); | |
218 | } | |
219 | // Response | |
220 | // | |
221 | void DimuonCombinator::SmearGauss(Float_t width, Float_t & value) | |
222 | { | |
223 | value+=gRandom->Gaus(0, width); | |
224 | } | |
225 | // Weighting | |
226 | // | |
227 | ||
228 | Float_t DimuonCombinator::Decay_Prob(GParticle* part) | |
229 | { | |
230 | Float_t d, h, theta, CTau; | |
231 | GParticle* parent = Parent(part); | |
232 | Int_t ipar=Type(parent); | |
233 | if (ipar==8 || ipar==9) { | |
234 | CTau=780.4; | |
235 | } else if (ipar==11 || ipar==12) { | |
236 | CTau=370.9; | |
237 | } else { | |
238 | CTau=0; | |
239 | } | |
240 | ||
241 | ||
242 | Float_t GammaBeta=(parent->GetMomentum())/(parent->GetMass()); | |
243 | // | |
244 | // this part is still very ALICE muon-arm specific | |
245 | // | |
246 | theta=parent->GetTheta(); | |
247 | h=90*TMath::Tan(theta); | |
248 | ||
249 | if (h<4) { | |
250 | d=4/TMath::Sin(theta); | |
251 | } else { | |
252 | d=90/TMath::Cos(theta); | |
253 | } | |
254 | ||
255 | if (CTau > 0) { | |
256 | return 1-TMath::Exp(-d/CTau/GammaBeta); | |
257 | } else { | |
258 | return 1; | |
259 | } | |
260 | } | |
261 | ||
262 | Float_t DimuonCombinator::Weight(GParticle* part1, GParticle* part2) | |
263 | { | |
264 | Float_t wgt=(part1->GetWgt())*(part2->GetWgt()); | |
265 | ||
266 | if (Correlated(part1, part2)) { | |
267 | return wgt/(Parent(part1)->GetWgt())*fRate1; | |
268 | } else { | |
269 | return wgt*fRate1*fRate2; | |
270 | } | |
271 | } | |
272 | ||
273 | ||
274 | Float_t DimuonCombinator::Weight(GParticle* part) | |
275 | { | |
276 | return (part->GetWgt())*(Parent(part)->GetWgt())*fRate1; | |
277 | } | |
278 | Bool_t DimuonCombinator::Correlated(GParticle* part1, GParticle* part2) | |
279 | { | |
280 | if (Origin(part1) == Origin(part2)) { | |
281 | return kTRUE; | |
282 | } else { | |
283 | return kFALSE; | |
284 | } | |
285 | } | |
286 | GParticle* DimuonCombinator::Parent(GParticle* part) | |
287 | { | |
288 | return (GParticle*) (fPartArray->UncheckedAt(part->GetParent())); | |
289 | } | |
290 | ||
291 | Int_t DimuonCombinator::Origin(GParticle* part) | |
292 | { | |
293 | Int_t iparent= part->GetParent(); | |
294 | if (iparent < 0) return iparent; | |
295 | Int_t ip; | |
296 | while(1) { | |
297 | ip=((GParticle*) fPartArray->UncheckedAt(iparent))->GetParent(); | |
298 | if (ip < 0) { | |
299 | break; | |
300 | } else { | |
301 | iparent=ip; | |
302 | } | |
303 | } | |
304 | return iparent; | |
305 | } | |
306 |