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9af36e3a | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
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 purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | //---------------------------------------------------------------------------- | |
17 | // Implementation of the D0toKpi class | |
18 | // for pp and PbPb interactions | |
19 | // Note: the two decay tracks are labelled: 0 (positive track) | |
20 | // 1 (negative track) | |
21 | // Origin: A. Dainese andrea.dainese@lnl.infn.it | |
22 | //---------------------------------------------------------------------------- | |
23 | ||
24 | #include <TH1.h> | |
25 | #include <TH2.h> | |
26 | #include <TCanvas.h> | |
27 | #include <TPaveLabel.h> | |
28 | #include <TVector3.h> | |
29 | ||
30 | #include "AliD0toKpi.h" | |
31 | ||
32 | ClassImp(AliD0toKpi) | |
33 | ||
34 | //---------------------------------------------------------------------------- | |
b30302f6 | 35 | AliD0toKpi::AliD0toKpi(): |
36 | fSignal(kFALSE), | |
37 | fEvent(0), | |
38 | fV1x(0.), | |
39 | fV1y(0.), | |
40 | fV1z(0.), | |
41 | fV2x(0.), | |
42 | fV2y(0.), | |
43 | fV2z(0.), | |
44 | fDCA(0.), | |
45 | fWgtAD0(0.), | |
46 | fWgtAD0bar(0.), | |
47 | fWgtBD0(0.), | |
48 | fWgtBD0bar(0.), | |
49 | fWgtCD0(0.), | |
50 | fWgtCD0bar(0.), | |
51 | fWgtDD0(0.), | |
52 | fWgtDD0bar(0.) | |
53 | { | |
9af36e3a | 54 | // Default constructor |
9af36e3a | 55 | |
56 | fTrkNum[0] = 0; | |
57 | fTrkNum[1] = 0; | |
58 | ||
9af36e3a | 59 | fPx[0] = 0.; |
60 | fPy[0] = 0.; | |
61 | fPz[0] = 0.; | |
62 | fPx[1] = 0.; | |
63 | fPy[1] = 0.; | |
64 | fPz[1] = 0.; | |
65 | ||
66 | fd0[0] = 0.; | |
67 | fd0[1] = 0.; | |
68 | ||
69 | fPdg[0] = 0; | |
70 | fPdg[1] = 0; | |
71 | fMum[0] = 0; | |
72 | fMum[1] = 0; | |
73 | ||
74 | fTagPi[0] = 0.; | |
75 | fTagPi[1] = 0.; | |
76 | fTagKa[0] = 0.; | |
77 | fTagKa[1] = 0.; | |
78 | fTagNid[0] = 0.; | |
79 | fTagNid[1] = 0.; | |
80 | ||
9af36e3a | 81 | } |
82 | //---------------------------------------------------------------------------- | |
83 | AliD0toKpi::AliD0toKpi(Int_t ev,Int_t trkNum[2], | |
84 | Double_t v1[3],Double_t v2[3], | |
85 | Double_t dca, | |
b30302f6 | 86 | Double_t mom[6],Double_t d0[2]): |
87 | fSignal(kFALSE), | |
88 | fEvent(ev), | |
89 | fV1x(v1[0]), | |
90 | fV1y(v1[1]), | |
91 | fV1z(v1[2]), | |
92 | fV2x(v2[0]), | |
93 | fV2y(v2[1]), | |
94 | fV2z(v2[2]), | |
95 | fDCA(dca), | |
96 | fWgtAD0(0.), | |
97 | fWgtAD0bar(0.), | |
98 | fWgtBD0(0.), | |
99 | fWgtBD0bar(0.), | |
100 | fWgtCD0(0.), | |
101 | fWgtCD0bar(0.), | |
102 | fWgtDD0(0.), | |
103 | fWgtDD0bar(0.) | |
104 | { | |
9af36e3a | 105 | // Constructor |
106 | ||
9af36e3a | 107 | fTrkNum[0] = trkNum[0]; |
108 | fTrkNum[1] = trkNum[1]; | |
109 | ||
9af36e3a | 110 | fPx[0] = mom[0]; |
111 | fPy[0] = mom[1]; | |
112 | fPz[0] = mom[2]; | |
113 | fPx[1] = mom[3]; | |
114 | fPy[1] = mom[4]; | |
115 | fPz[1] = mom[5]; | |
116 | ||
117 | fd0[0] = d0[0]; | |
118 | fd0[1] = d0[1]; | |
119 | ||
120 | fPdg[0] = 0; | |
121 | fPdg[1] = 0; | |
122 | fMum[0] = 0; | |
123 | fMum[1] = 0; | |
124 | ||
125 | fTagPi[0] = 0.; | |
126 | fTagPi[1] = 0.; | |
127 | fTagKa[0] = 0.; | |
128 | fTagKa[1] = 0.; | |
129 | fTagNid[0] = 0.; | |
130 | fTagNid[1] = 0.; | |
9af36e3a | 131 | } |
132 | //---------------------------------------------------------------------------- | |
133 | AliD0toKpi::~AliD0toKpi() {} | |
9af36e3a | 134 | //---------------------------------------------------------------------------- |
135 | void AliD0toKpi::ApplyPID(TString pidScheme) { | |
136 | // Applies particle identification | |
137 | ||
138 | if((!pidScheme.CompareTo("TOFparamPbPb") || !pidScheme.CompareTo("TOFparamPP")) && fPdg[0]==0) { | |
139 | printf("AliD0toKpi::ApplyPID :\n Warning: TOF parameterized PID can be used only for simulation!\n"); | |
140 | return; | |
141 | } | |
142 | ||
143 | if(!pidScheme.CompareTo("TOFparamPbPb")) { | |
144 | // tagging of the positive track | |
145 | if(TMath::Abs(fPdg[0])==211 || TMath::Abs(fPdg[0])==13 | |
146 | || TMath::Abs(fPdg[0])==11) { // pion,muon,electron | |
147 | fTagPi[0] = LinearInterpolation(PChild(0),kPiBinsPbPb,kPiBinWidthPbPb,kPiTagPiPbPb); | |
148 | fTagNid[0] = 1.-fTagPi[0]; | |
149 | fTagKa[0] = 0.; | |
150 | fTagPr[0] = 0.; | |
151 | } | |
152 | if(TMath::Abs(fPdg[0])==321) { // kaon | |
153 | fTagKa[0] = LinearInterpolation(PChild(0),kKBinsPbPb,kKBinWidthPbPb,kKTagKPbPb); | |
154 | fTagNid[0] = LinearInterpolation(PChild(0),kKBinsPbPb,kKBinWidthPbPb,kKTagNidPbPb); | |
155 | if((fTagNid[0]+fTagKa[0])>1.) fTagNid[0] = 1.-fTagKa[0]; | |
156 | fTagPi[0] = 1.-fTagNid[0]-fTagKa[0]; | |
157 | fTagPr[0] = 0.; | |
158 | } | |
159 | if(TMath::Abs(fPdg[0])==2212) { // proton | |
160 | fTagPr[0] = LinearInterpolation(PChild(0),kPBinsPbPb,kPBinWidthPbPb,kPTagPPbPb); | |
161 | fTagNid[0] = LinearInterpolation(PChild(0),kPBinsPbPb,kPBinWidthPbPb,kPTagNidPbPb); | |
162 | if((fTagNid[0]+fTagPr[0])>1.) fTagNid[0] = 1.-fTagPr[0]; | |
163 | fTagPi[0] = 1.-fTagNid[0]-fTagPr[0]; | |
164 | fTagKa[0] = 0.; | |
165 | } | |
166 | // tagging of the negative track | |
167 | if(TMath::Abs(fPdg[1])==211 || TMath::Abs(fPdg[1])==13 | |
168 | || TMath::Abs(fPdg[1])==11) { // pion,muon,electron | |
169 | fTagPi[1] = LinearInterpolation(PChild(1),kPiBinsPbPb,kPiBinWidthPbPb,kPiTagPiPbPb); | |
170 | fTagNid[1] = 1.-fTagPi[1]; | |
171 | fTagKa[1] = 0.; | |
172 | fTagPr[1] = 0.; | |
173 | } | |
174 | if(TMath::Abs(fPdg[1])==321) { // kaon | |
175 | fTagKa[1] = LinearInterpolation(PChild(1),kKBinsPbPb,kKBinWidthPbPb,kKTagKPbPb); | |
176 | fTagNid[1] = LinearInterpolation(PChild(1),kKBinsPbPb,kKBinWidthPbPb,kKTagNidPbPb); | |
177 | if((fTagNid[1]+fTagKa[1])>1.) fTagNid[1] = 1.-fTagKa[1]; | |
178 | fTagPi[1] = 1.-fTagNid[1]-fTagKa[1]; | |
179 | fTagPr[1] = 0.; | |
180 | } | |
181 | if(TMath::Abs(fPdg[1])==2212) { // proton | |
182 | fTagPr[1] = LinearInterpolation(PChild(1),kPBinsPbPb,kPBinWidthPbPb,kPTagPPbPb); | |
183 | fTagNid[1] = LinearInterpolation(PChild(1),kPBinsPbPb,kPBinWidthPbPb,kPTagNidPbPb); | |
184 | if((fTagNid[1]+fTagPr[1])>1.) fTagNid[1] = 1.-fTagPr[1]; | |
185 | fTagPi[1] = 1.-fTagNid[1]-fTagPr[1]; | |
186 | fTagKa[1] = 0.; | |
187 | } | |
188 | } | |
189 | ||
190 | ||
191 | if(!pidScheme.CompareTo("TOFparamPP")) { | |
192 | // tagging of the positive track | |
193 | if(TMath::Abs(fPdg[0])==211 || TMath::Abs(fPdg[0])==13 | |
194 | || TMath::Abs(fPdg[0])==11) { // pion,muon,electron | |
195 | fTagPi[0] = LinearInterpolation(PChild(0),kPiBinsPP,kPiBinWidthPP,kPiTagPiPP); | |
196 | fTagNid[0] = 1.-fTagPi[0]; | |
197 | fTagKa[0] = 0.; | |
198 | fTagPr[0] = 0.; | |
199 | } | |
200 | if(TMath::Abs(fPdg[0])==321) { // kaon | |
201 | fTagKa[0] = LinearInterpolation(PChild(0),kKBinsPP,kKBinWidthPP,kKTagKPP); | |
202 | fTagNid[0] = LinearInterpolation(PChild(0),kKBinsPP,kKBinWidthPP,kKTagNidPP); | |
203 | if((fTagNid[0]+fTagKa[0])>1.) fTagNid[0] = 1.-fTagKa[0]; | |
204 | fTagPi[0] = 1.-fTagNid[0]-fTagKa[0]; | |
205 | fTagPr[0] = 0.; | |
206 | } | |
207 | if(TMath::Abs(fPdg[0])==2212) { // proton | |
208 | fTagPr[0] = LinearInterpolation(PChild(0),kPBinsPP,kPBinWidthPP,kPTagPPP); | |
209 | fTagNid[0] = LinearInterpolation(PChild(0),kPBinsPP,kPBinWidthPP,kPTagNidPP); | |
210 | if((fTagNid[0]+fTagPr[0])>1.) fTagNid[0] = 1.-fTagPr[0]; | |
211 | fTagPi[0] = 1.-fTagNid[0]-fTagPr[0]; | |
212 | fTagKa[0] = 0.; | |
213 | } | |
214 | // tagging of the negative track | |
215 | if(TMath::Abs(fPdg[1])==211 || TMath::Abs(fPdg[1])==13 | |
216 | || TMath::Abs(fPdg[1])==11) { // pion,muon,electron | |
217 | fTagPi[1] = LinearInterpolation(PChild(1),kPiBinsPP,kPiBinWidthPP,kPiTagPiPP); | |
218 | fTagNid[1] = 1.-fTagPi[1]; | |
219 | fTagKa[1] = 0.; | |
220 | fTagPr[1] = 0.; | |
221 | } | |
222 | if(TMath::Abs(fPdg[1])==321) { // kaon | |
223 | fTagKa[1] = LinearInterpolation(PChild(1),kKBinsPP,kKBinWidthPP,kKTagKPP); | |
224 | fTagNid[1] = LinearInterpolation(PChild(1),kKBinsPP,kKBinWidthPP,kKTagNidPP); | |
225 | if((fTagNid[1]+fTagKa[1])>1.) fTagNid[1] = 1.-fTagKa[1]; | |
226 | fTagPi[1] = 1.-fTagNid[1]-fTagKa[1]; | |
227 | fTagPr[1] = 0.; | |
228 | } | |
229 | if(TMath::Abs(fPdg[1])==2212) { // proton | |
230 | fTagPr[1] = LinearInterpolation(PChild(1),kPBinsPP,kPBinWidthPP,kPTagPPP); | |
231 | fTagNid[1] = LinearInterpolation(PChild(1),kPBinsPP,kPBinWidthPP,kPTagNidPP); | |
232 | if((fTagNid[1]+fTagPr[1])>1.) fTagNid[1] = 1.-fTagPr[1]; | |
233 | fTagPi[1] = 1.-fTagNid[1]-fTagPr[1]; | |
234 | fTagKa[1] = 0.; | |
235 | } | |
236 | } | |
237 | ||
238 | return; | |
239 | } | |
240 | //---------------------------------------------------------------------------- | |
241 | Double_t AliD0toKpi::ChildrenRelAngle() const { | |
242 | // relative angle between K and pi | |
243 | ||
244 | TVector3 mom0(fPx[0],fPy[0],fPz[0]); | |
245 | TVector3 mom1(fPx[1],fPy[1],fPz[1]); | |
246 | ||
247 | Double_t angle = mom0.Angle(mom1); | |
248 | ||
249 | return angle; | |
250 | } | |
251 | //---------------------------------------------------------------------------- | |
252 | void AliD0toKpi::ComputeWgts() { | |
253 | // calculate the weights for PID | |
254 | ||
255 | ||
256 | // assignement of the weights from PID | |
257 | fWgtAD0 = fTagKa[1]*(fTagPi[0]+fTagNid[0]); | |
258 | fWgtAD0bar = fTagKa[0]*(fTagPi[1]+fTagNid[1]); | |
259 | fWgtBD0 = fTagPi[0]*fTagNid[1]; | |
260 | fWgtBD0bar = fTagPi[1]*fTagNid[0]; | |
261 | fWgtCD0 = fTagNid[0]*fTagNid[1]; | |
262 | fWgtCD0bar = fTagNid[0]*fTagNid[1]; | |
263 | fWgtDD0 = 1.-fWgtAD0-fWgtBD0-fWgtCD0; | |
264 | fWgtDD0bar = 1.-fWgtAD0bar-fWgtBD0bar-fWgtCD0bar; | |
265 | ||
266 | /* | |
267 | cerr<<fWgtAD0<<" "<<fWgtAD0bar<<endl; | |
268 | cerr<<fWgtBD0<<" "<<fWgtBD0bar<<endl; | |
269 | cerr<<fWgtCD0<<" "<<fWgtCD0bar<<endl; | |
270 | cerr<<fWgtDD0<<" "<<fWgtDD0bar<<endl; | |
271 | */ | |
272 | /* | |
273 | if(fWgtAD0<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n"; | |
274 | if(fWgtAD0bar<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n"; | |
275 | if(fWgtBD0<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n"; | |
276 | if(fWgtBD0bar<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n"; | |
277 | if(fWgtCD0<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n"; | |
278 | if(fWgtCD0bar<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n"; | |
279 | */ | |
280 | ||
281 | return; | |
282 | } | |
283 | //---------------------------------------------------------------------------- | |
284 | void AliD0toKpi::CorrectWgt4BR(Double_t factor) { | |
285 | // correct weights of background from charm | |
286 | ||
287 | fWgtAD0 *= factor; | |
288 | fWgtAD0bar *= factor; | |
289 | fWgtBD0 *= factor; | |
290 | fWgtBD0bar *= factor; | |
291 | fWgtCD0 *= factor; | |
292 | fWgtCD0bar *= factor; | |
293 | fWgtDD0 *= factor; | |
294 | fWgtDD0bar *= factor; | |
295 | ||
296 | return; | |
297 | } | |
298 | //---------------------------------------------------------------------------- | |
299 | Double_t AliD0toKpi::CosPointing() const { | |
300 | // cosine of pointing angle in space | |
301 | ||
302 | TVector3 mom(Px(),Py(),Pz()); | |
303 | TVector3 flight(fV2x-fV1x,fV2y-fV1y,fV2z-fV1z); | |
304 | ||
305 | Double_t pta = mom.Angle(flight); | |
306 | ||
307 | return TMath::Cos(pta); | |
308 | } | |
309 | //---------------------------------------------------------------------------- | |
310 | Double_t AliD0toKpi::CosPointingXY() const { | |
311 | // cosine of pointing angle in transverse plane | |
312 | ||
313 | TVector3 momXY(Px(),Py(),0.); | |
314 | TVector3 flightXY(fV2x-fV1x,fV2y-fV1y,0.); | |
315 | ||
316 | Double_t ptaXY = momXY.Angle(flightXY); | |
317 | ||
318 | return TMath::Cos(ptaXY); | |
319 | } | |
320 | //---------------------------------------------------------------------------- | |
321 | void AliD0toKpi::CosThetaStar(Double_t &ctsD0,Double_t &ctsD0bar) const { | |
322 | // cosine of decay angle in the D0 rest frame | |
323 | ||
324 | Double_t pStar = TMath::Sqrt(TMath::Power(kMD0*kMD0-kMK*kMK-kMPi*kMPi,2.)-4.*kMK*kMK*kMPi*kMPi)/(2.*kMD0); | |
325 | ||
326 | Double_t beta = P()/Energy(); | |
327 | Double_t gamma = Energy()/kMD0; | |
328 | ||
329 | ctsD0 = (Ql(1)/gamma-beta*TMath::Sqrt(pStar*pStar+kMK*kMK))/pStar; | |
330 | // if(ctsD0 > 1.) { cerr<<"AliD0toKpi::CosThetaStar: > 1 "<<ctsD0<<"!\n"; } | |
331 | // if(ctsD0 < -1.) { cerr<<"AliD0toKpi::CosThetaStar: < -1 "<<ctsD0<<"!\n"; } | |
332 | ||
333 | ctsD0bar = (Ql(0)/gamma-beta*TMath::Sqrt(pStar*pStar+kMK*kMK))/pStar; | |
334 | // if(ctsD0bar > 1.) { cerr<<"AliD0toKpi::CosThetaStar: > 1 "<<ctsD0bar<<"!\n"; } | |
335 | // if(ctsD0bar < -1.) { cerr<<"AliD0toKpi::CosThetaStar: < -1 "<<ctsD0bar<<"!\n";} | |
336 | ||
337 | return; | |
338 | } | |
339 | //---------------------------------------------------------------------------- | |
340 | Double_t AliD0toKpi::Eta() const { | |
341 | // pseudorapidity of the D0 | |
342 | ||
343 | Double_t theta = TMath::Pi()/2.-TMath::ATan2(Pz(),Pt()); | |
344 | Double_t eta = -TMath::Log(TMath::Tan(theta/2.)); | |
345 | return eta; | |
346 | } | |
347 | //---------------------------------------------------------------------------- | |
348 | Double_t AliD0toKpi::EtaChild(Int_t child) const { | |
349 | // pseudorapidity of the decay tracks | |
350 | ||
351 | Double_t theta = TMath::Pi()/2.-TMath::ATan2(fPz[child],PtChild(child)); | |
352 | Double_t eta = -TMath::Log(TMath::Tan(theta/2.)); | |
353 | return eta; | |
354 | } | |
355 | //---------------------------------------------------------------------------- | |
356 | void AliD0toKpi::GetWgts(Double_t &WgtD0,Double_t &WgtD0bar,TString sample) | |
357 | const { | |
358 | // returns the weights for pid | |
359 | ||
360 | if(!sample.CompareTo("A")) { WgtD0 = fWgtAD0; WgtD0bar = fWgtAD0bar; } | |
361 | if(!sample.CompareTo("B")) { WgtD0 = fWgtBD0; WgtD0bar = fWgtBD0bar; } | |
362 | if(!sample.CompareTo("C")) { WgtD0 = fWgtCD0; WgtD0bar = fWgtCD0bar; } | |
363 | if(!sample.CompareTo("D")) { WgtD0 = fWgtDD0; WgtD0bar = fWgtDD0bar; } | |
364 | if(!sample.CompareTo("ABCD")) { | |
365 | WgtD0 = fWgtAD0+fWgtBD0+fWgtCD0+fWgtDD0; | |
366 | WgtD0bar = fWgtAD0bar+fWgtBD0bar+fWgtCD0bar+fWgtDD0bar; | |
367 | } | |
368 | if(!sample.CompareTo("ABC")) { | |
369 | WgtD0 = fWgtAD0+fWgtBD0+fWgtCD0; | |
370 | WgtD0bar = fWgtAD0bar+fWgtBD0bar+fWgtCD0bar; | |
371 | } | |
372 | if(!sample.CompareTo("BC")) { | |
373 | WgtD0 = fWgtBD0+fWgtCD0; | |
374 | WgtD0bar = fWgtBD0bar+fWgtCD0bar; | |
375 | } | |
376 | ||
377 | return; | |
378 | } | |
379 | //---------------------------------------------------------------------------- | |
380 | Double_t AliD0toKpi::ImpPar() const { | |
381 | // D0 impact parameter in the bending plane | |
382 | ||
383 | Double_t k = -(fV2x-fV1x)*Px()-(fV2y-fV1y)*Py(); | |
384 | k /= Pt()*Pt(); | |
385 | Double_t dx = fV2x-fV1x+k*Px(); | |
386 | Double_t dy = fV2y-fV1y+k*Py(); | |
387 | Double_t absDD = TMath::Sqrt(dx*dx+dy*dy); | |
388 | TVector3 mom(Px(),Py(),Pz()); | |
389 | TVector3 flight(fV2x-fV1x,fV2y-fV1y,fV2z-fV1z); | |
390 | TVector3 cross = mom.Cross(flight); | |
391 | return (cross.Z()>0. ? absDD : -absDD); | |
392 | } | |
393 | //---------------------------------------------------------------------------- | |
394 | void AliD0toKpi::InvMass(Double_t &mD0,Double_t &mD0bar) const { | |
395 | // invariant mass as D0 and as D0bar | |
396 | ||
397 | Double_t energy[2]; | |
398 | ||
399 | // D0 -> K- Pi+ | |
400 | energy[1] = TMath::Sqrt(kMK*kMK+PChild(1)*PChild(1)); | |
401 | energy[0] = TMath::Sqrt(kMPi*kMPi+PChild(0)*PChild(0)); | |
402 | ||
403 | mD0 = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-P()*P()); | |
404 | ||
405 | ||
406 | // D0bar -> K+ Pi- | |
407 | energy[0] = TMath::Sqrt(kMK*kMK+PChild(0)*PChild(0)); | |
408 | energy[1] = TMath::Sqrt(kMPi*kMPi+PChild(1)*PChild(1)); | |
409 | ||
410 | mD0bar = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-P()*P()); | |
411 | ||
412 | return; | |
413 | ||
414 | } | |
415 | //---------------------------------------------------------------------------- | |
416 | Double_t AliD0toKpi::Ql(Int_t child) const { | |
417 | // longitudinal momentum of decay tracks w.r.t. to D0 momentum | |
418 | ||
419 | Double_t qL; | |
420 | TVector3 mom(fPx[child],fPy[child],fPz[child]); | |
421 | TVector3 momD(Px(),Py(),Pz()); | |
422 | ||
423 | qL = mom.Dot(momD)/momD.Mag(); | |
424 | ||
425 | return qL ; | |
426 | } | |
427 | //---------------------------------------------------------------------------- | |
428 | Double_t AliD0toKpi::Qt() const { | |
429 | // transverse momentum of decay tracks w.r.t. to D0 momentum | |
430 | ||
431 | TVector3 mom0(fPx[0],fPy[0],fPz[0]); | |
432 | TVector3 momD(Px(),Py(),Pz()); | |
433 | ||
434 | return mom0.Perp(momD); | |
435 | } | |
436 | //---------------------------------------------------------------------------- | |
437 | Bool_t AliD0toKpi::Select(const Double_t* cuts,Int_t& okD0,Int_t& okD0bar) | |
438 | const { | |
439 | // | |
440 | // This function compares the D0 with a set of cuts: | |
441 | // | |
442 | // cuts[0] = inv. mass half width [GeV] | |
443 | // cuts[1] = dca [micron] | |
444 | // cuts[2] = cosThetaStar | |
445 | // cuts[3] = pTK [GeV/c] | |
446 | // cuts[4] = pTPi [GeV/c] | |
447 | // cuts[5] = d0K [micron] upper limit! | |
448 | // cuts[6] = d0Pi [micron] upper limit! | |
449 | // cuts[7] = d0d0 [micron^2] | |
450 | // cuts[8] = cosThetaPoint | |
451 | // | |
452 | // If the D0/D0bar doesn't pass the cuts it sets the weights to 0 | |
453 | // If neither D0 nor D0bar pass the cuts return kFALSE | |
454 | // | |
455 | Double_t mD0,mD0bar,ctsD0,ctsD0bar; | |
456 | okD0=1; okD0bar=1; | |
457 | ||
458 | if(PtChild(1) < cuts[3] || PtChild(0) < cuts[4]) okD0 = 0; | |
459 | if(PtChild(0) < cuts[3] || PtChild(1) < cuts[4]) okD0bar = 0; | |
460 | if(!okD0 && !okD0bar) return kFALSE; | |
461 | ||
462 | if(TMath::Abs(Getd0Child(1)) > cuts[5] || | |
463 | TMath::Abs(Getd0Child(0)) > cuts[6]) okD0 = 0; | |
464 | if(TMath::Abs(Getd0Child(0)) > cuts[6] || | |
465 | TMath::Abs(Getd0Child(1)) > cuts[5]) okD0bar = 0; | |
466 | if(!okD0 && !okD0bar) return kFALSE; | |
467 | ||
468 | if(GetDCA() > cuts[1]) { okD0 = okD0bar = 0; return kFALSE; } | |
469 | ||
470 | InvMass(mD0,mD0bar); | |
471 | if(TMath::Abs(mD0-kMD0) > cuts[0]) okD0 = 0; | |
472 | if(TMath::Abs(mD0bar-kMD0) > cuts[0]) okD0bar = 0; | |
473 | if(!okD0 && !okD0bar) return kFALSE; | |
474 | ||
475 | CosThetaStar(ctsD0,ctsD0bar); | |
476 | if(TMath::Abs(ctsD0) > cuts[2]) okD0 = 0; | |
477 | if(TMath::Abs(ctsD0bar) > cuts[2]) okD0bar = 0; | |
478 | if(!okD0 && !okD0bar) return kFALSE; | |
479 | ||
480 | if(ProdImpParams() > cuts[7]) { okD0 = okD0bar = 0; return kFALSE; } | |
481 | ||
482 | if(CosPointing() < cuts[8]) { okD0 = okD0bar = 0; return kFALSE; } | |
483 | ||
484 | return kTRUE; | |
485 | } | |
486 | //----------------------------------------------------------------------------- | |
487 | void AliD0toKpi::SetPIDresponse(Double_t resp0[5],Double_t resp1[5]) { | |
488 | // Set combined PID detector response probabilities | |
489 | ||
490 | fPIDrespEl[0] = resp0[0]; | |
491 | fPIDrespEl[1] = resp1[0]; | |
492 | fPIDrespMu[0] = resp0[1]; | |
493 | fPIDrespMu[1] = resp1[1]; | |
494 | fPIDrespPi[0] = resp0[2]; | |
495 | fPIDrespPi[1] = resp1[2]; | |
496 | fPIDrespKa[0] = resp0[3]; | |
497 | fPIDrespKa[1] = resp1[3]; | |
498 | fPIDrespPr[0] = resp0[4]; | |
499 | fPIDrespPr[1] = resp1[4]; | |
500 | ||
501 | return; | |
502 | } | |
503 | //---------------------------------------------------------------------------- | |
504 | Double_t AliD0toKpi::LinearInterpolation(Double_t p,Int_t nBins,Double_t Bin, | |
505 | const Double_t *values) const { | |
506 | // a linear interpolation method | |
507 | ||
508 | Double_t value=0; | |
509 | Double_t slope; | |
510 | ||
511 | if(p<0.5*Bin) { | |
512 | value = values[0]; | |
513 | } else if(p>=(nBins-0.5)*Bin) { | |
514 | slope = (2*values[nBins-1]-values[nBins-2]-values[nBins-3])/Bin/2; | |
515 | value = values[nBins-2]+slope*(p-Bin*(nBins-1.5)); | |
516 | } else { | |
517 | for(Int_t i=0; i<nBins; i++) { | |
518 | if(p<(i+0.5)*Bin) { | |
519 | slope = (values[i]-values[i-1])/Bin; | |
520 | value = values[i-1]+slope*(p-Bin*(i-0.5)); | |
521 | break; | |
522 | } | |
523 | } | |
524 | } | |
525 | ||
526 | if(value<0.) value=0.; | |
527 | if(value>1.) value=1.; | |
528 | ||
529 | return value; | |
530 | } | |
531 | //---------------------------------------------------------------------------- | |
532 | ||
533 | ||
534 | ||
535 | ||
536 | ||
537 | ||
538 | ||
539 | ||
540 |