]> git.uio.no Git - u/mrichter/AliRoot.git/blame - HLT/trigger/AliD0toKpi.cxx
git://git.uio.no / u / mrichter / AliRoot.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Added support for static libraries,
[u/mrichter/AliRoot.git] / HLT / trigger / AliD0toKpi.cxx
CommitLineData
3e87ef69 1#include <iostream.h>
2#include <TH1.h>
3#include <TH2.h>
4#include <TCanvas.h>
5#include <TPaveLabel.h>
6#include "AliD0toKpi.h"
7
8ClassImp(AliD0toKpi)
9 /*******************************************************************
10 * *
11 * Reconstructed D^0 -> K^- pi^+ candidate class *
12 * *
13 * origin: A. Dainese andrea.dainese@pd.infn.it *
14 *******************************************************************/
15
16//________________________________________________________
17AliD0toKpi::AliD0toKpi() {
18
19 // Default constructor
20 fSignal = kFALSE;
21
22 fEvent = 0;
23
24 fV1x = 0.;
25 fV1y = 0.;
26 fV1z = 0.;
27 fV2x = 0.;
28 fV2y = 0.;
29 fV2z = 0.;
30 fDCA = 0.;
31
32 fPx[0] = 0.;
33 fPy[0] = 0.;
34 fPz[0] = 0.;
35 fPx[1] = 0.;
36 fPy[1] = 0.;
37 fPz[1] = 0.;
38
39 fd0[0] = 0.;
40 fd0[1] = 0.;
41
42 fPdg[0] = 0;
43 fPdg[1] = 0;
44 fMum[0] =0;
45 fMum[1] =0;
46
47
48 fWgtAD0 = fWgtAD0bar = fWgtBD0 = fWgtBD0bar = fWgtCD0 = fWgtCD0bar = 0;
49
50}
51
52//________________________________________________________
53AliD0toKpi::AliD0toKpi(Bool_t sgn,Int_t ev,
54 Double_t v1[3],Double_t v2[3],
55 Double_t dca,
56 Double_t mom[6],Double_t d0[2],
57 Int_t pdg[2],Int_t mum[2]) {
58
59 // Standard constructor
60 fSignal = sgn;
61
62 fEvent = ev;
63
64 fV1x = v1[0];
65 fV1y = v1[1];
66 fV1z = v1[2];
67 fV2x = v2[0];
68 fV2y = v2[1];
69 fV2z = v2[2];
70 fDCA = dca;
71
72 fPx[0] = mom[0];
73 fPy[0] = mom[1];
74 fPz[0] = mom[2];
75 fPx[1] = mom[3];
76 fPy[1] = mom[4];
77 fPz[1] = mom[5];
78
79 fd0[0] = d0[0];
80 fd0[1] = d0[1];
81
82 fPdg[0] = pdg[0];
83 fPdg[1] = pdg[1];
84 fMum[0] = mum[0];
85 fMum[1] = mum[1];
86
87
88 fWgtAD0 = fWgtAD0bar = fWgtBD0 = fWgtBD0bar = fWgtCD0 = fWgtCD0bar = 0;
89}
90
91//_____________________________________________________________________
92Double_t AliD0toKpi::EtaChild(Int_t child) const {
93
94 Double_t theta = TMath::Pi()/2.-TMath::ATan2(fPz[child],PtChild(child));
95 Double_t eta = -TMath::Log(TMath::Tan(theta/2.));
96 return eta;
97}
98//_____________________________________________________________________
99Double_t AliD0toKpi::Eta() const {
100
101 Double_t theta = TMath::Pi()/2.-TMath::ATan2(Pz(),Pt());
102 Double_t eta = -TMath::Log(TMath::Tan(theta/2.));
103 return eta;
104}
105
106//_____________________________________________________________________
107Double_t AliD0toKpi::CPta() const {
108
109 TVector3 mom(Px(),Py(),Pz());
110 TVector3 flight(fV2x-fV1x,fV2y-fV1y,fV2z-fV1z);
111
112 Double_t pta = mom.Angle(flight);
113
114 return TMath::Cos(pta);
115}
116//_____________________________________________________________________
117Double_t AliD0toKpi::CPtaXY() const {
118
119 TVector3 momXY(Px(),Py(),0.);
120 TVector3 flightXY(fV2x-fV1x,fV2y-fV1y,0.);
121
122 Double_t ptaXY = momXY.Angle(flightXY);
123
124 return TMath::Cos(ptaXY);
125}
126//_____________________________________________________________________
127Double_t AliD0toKpi::ChildrenRelAngle() const {
128
129 TVector3 mom0(fPx[0],fPy[0],fPz[0]);
130 TVector3 mom1(fPx[1],fPy[1],fPz[1]);
131
132 Double_t angle = mom0.Angle(mom1);
133
134 return angle;
135}
136//_____________________________________________________________________
137void AliD0toKpi::DrawPIDinTOF() const {
138
139 TH2F* framePi = new TH2F("framePi","Tag probabilities for PIONS",2,0,2.5,2,0,1);
140 framePi->SetXTitle("p [GeV/c]");
141 framePi->SetStats(0);
142 TH2F* frameK = new TH2F("frameK","Tag probabilities for KAONS",2,0,2.5,2,0,1);
143 frameK->SetXTitle("p [GeV/c]");
144 frameK->SetStats(0);
145 TH2F* frameP = new TH2F("frameP","Tag probabilities for PROTONS",2,0,4.5,2,0,1);
146 frameP->SetXTitle("p [GeV/c]");
147 frameP->SetStats(0);
148
149 TH1F* hPiPi = new TH1F("hPiPi","Tag probabilities for PIONS",kPiBins,0,2.5);
150 TH1F* hPiNid = new TH1F("hPiNid","Tag probabilities for PIONS",kPiBins,0,2.5);
151
152 TH1F* hKK = new TH1F("hKK","Tag probabilities for KAONS",kKBins,0,2.5);
153 TH1F* hKNid = new TH1F("hKNid","Tag probabilities for KAONS",kKBins,0,2.5);
154 TH1F* hKPi = new TH1F("hKPi","Tag probabilities for KAONS",kKBins,0,2.5);
155
156 TH1F* hPP = new TH1F("hPP","Tag probabilities for PROTONS",kPBins,0,4.5);
157 TH1F* hPNid = new TH1F("hPNid","Tag probabilities for PROTONS",kPBins,0,4.5);
158 TH1F* hPPi = new TH1F("hPPi","Tag probabilities for PROTONS",kPBins,0,4.5);
159
160 for(Int_t i=1; i<=kPiBins; i++) {
161 hPiPi->SetBinContent(i,kPiTagPi[i-1]);
162 hPiNid->SetBinContent(i,kPiTagPi[i-1]+kPiTagNid[i-1]);
163
164 hKK->SetBinContent(i,kKTagK[i-1]);
165 hKPi->SetBinContent(i,kKTagK[i-1]+kKTagPi[i-1]);
166 hKNid->SetBinContent(i,kKTagK[i-1]+kKTagPi[i-1]+kKTagNid[i-1]);
167 }
168 for(Int_t i=1; i<=kPBins; i++) {
169 hPP->SetBinContent(i,kPTagP[i-1]);
170 hPPi->SetBinContent(i,kPTagP[i-1]+kPTagPi[i-1]);
171 hPNid->SetBinContent(i,kPTagP[i-1]+kPTagPi[i-1]+kPTagNid[i-1]);
172 }
173
174 TCanvas* c = new TCanvas("c","PID",0,0,1000,400);
175 c->Divide(3,1);
176 c->cd(1);
177 framePi->Draw();
178 hPiNid->SetFillColor(18); hPiNid->Draw("same");
179 hPiPi->SetFillColor(4); hPiPi->Draw("same");
180 TPaveLabel* pav1 = new TPaveLabel(1,.2,1.4,.3,"#pi");
181 pav1->SetBorderSize(0);
182 pav1->Draw("same");
183 TPaveLabel* pav2 = new TPaveLabel(1,.8,1.8,.9,"non-id");
184 pav2->SetBorderSize(0);
185 pav2->Draw("same");
186
187 c->cd(2);
188 frameK->Draw();
189 hKNid->SetFillColor(18); hKNid->Draw("same");
190 hKPi->SetFillColor(4); hKPi->Draw("same");
191 hKK->SetFillColor(7); hKK->Draw("same");
192 TPaveLabel* pav3 = new TPaveLabel(1,.2,1.5,.3,"K");
193 pav3->SetBorderSize(0);
194 pav3->Draw("same");
195 TPaveLabel* pav4 = new TPaveLabel(1,.8,1.8,.9,"non-id");
196 pav4->SetBorderSize(0);
197 pav4->Draw("same");
198 TPaveLabel* pav5 = new TPaveLabel(.4,.5,.8,.6,"#pi");
199 pav5->SetBorderSize(0);
200 pav5->Draw("same");
201
202 c->cd(3);
203 frameP->Draw();
204 hPNid->SetFillColor(18); hPNid->Draw("same");
205 hPPi->SetFillColor(4); hPPi->Draw("same");
206 hPP->SetFillColor(3); hPP->Draw("same");
207 TPaveLabel* pav6 = new TPaveLabel(1,.2,1.5,.3,"p");
208 pav6->SetBorderSize(0);
209 pav6->Draw("same");
210 TPaveLabel* pav7 = new TPaveLabel(1,.8,2.6,.9,"non-id");
211 pav7->SetBorderSize(0);
212 pav7->Draw("same");
213 TPaveLabel* pav8 = new TPaveLabel(.2,.5,1,.6,"#pi");
214 pav8->SetBorderSize(0);
215 pav8->Draw("same");
216
217
218 return;
219}
220//___________________________________________________________________________
221Double_t AliD0toKpi::LinearInterpolation(Double_t p,Int_t nBins,Double_t Bin,const Double_t *values) const {
222
223 Double_t value=0;
224 Double_t slope;
225
226 if(p<0.5*Bin) {
227 value = values[0];
228 } else if(p>=(nBins-0.5)*Bin) {
229 //slope = (values[nBins-1]-values[nBins-2])/Bin;
230 slope = (2*values[nBins-1]-values[nBins-2]-values[nBins-3])/Bin/2;
231 value = values[nBins-2]+slope*(p-Bin*(nBins-1.5));
232 } else {
233 for(Int_t i=0; i<nBins; i++) {
234 if(p<(i+0.5)*Bin) {
235 slope = (values[i]-values[i-1])/Bin;
236 value = values[i-1]+slope*(p-Bin*(i-0.5));
237 break;
238 }
239 }
240 }
241
242 if(value<0) value=0.;
243 if(value>1) value=1.;
244 return value;
245}
246//______________________________________________________________________
247void AliD0toKpi::ComputeWgts() {
248
249 Double_t probTagPi[2] = {0.,0.};
250 Double_t probTagK[2] = {0.,0.};
251 Double_t probTagNid[2] = {0.,0.};
252 Double_t probTagP[2] = {0.,0.};
253
254 // tagging of the positive track
255 if(TMath::Abs(fPdg[0])==211 || TMath::Abs(fPdg[0])==13
256 || TMath::Abs(fPdg[0])==11) { // pion,muon,electron
257 probTagPi[0] = LinearInterpolation(PChild(0),kPiBins,kPiBinWidth,kPiTagPi);
258 probTagNid[0] = 1.-probTagPi[0];
259 probTagK[0] = 0.;
260 probTagP[0] = 0.;
261 }
262 if(TMath::Abs(fPdg[0])==321) { // kaon
263 probTagK[0] = LinearInterpolation(PChild(0),kKBins,kKBinWidth,kKTagK);
264 probTagNid[0] = LinearInterpolation(PChild(0),kKBins,kKBinWidth,kKTagNid);
265 if((probTagNid[0]+probTagK[0])>1.) probTagNid[0] = 1.-probTagK[0];
266 probTagPi[0] = 1.-probTagNid[0]-probTagK[0];
267 probTagP[0] = 0.;
268 }
269 if(TMath::Abs(fPdg[0])==2212) { // proton
270 probTagP[0] = LinearInterpolation(PChild(0),kPBins,kPBinWidth,kPTagP);
271 probTagNid[0] = LinearInterpolation(PChild(0),kPBins,kPBinWidth,kPTagNid);
272 if((probTagNid[0]+probTagP[0])>1.) probTagNid[0] = 1.-probTagP[0];
273 probTagPi[0] = 1.-probTagNid[0]-probTagP[0];
274 probTagK[0] = 0.;
275 }
276
277
278 // tagging of the negative track
279 if(TMath::Abs(fPdg[1])==211 || TMath::Abs(fPdg[1])==13
280 || TMath::Abs(fPdg[1])==11) { // pion,muon,electron
281 probTagPi[1] = LinearInterpolation(PChild(1),kPiBins,kPiBinWidth,kPiTagPi);
282 probTagNid[1] = 1.-probTagPi[1];
283 probTagK[1] = 0.;
284 probTagP[1] = 0.;
285 }
286 if(TMath::Abs(fPdg[1])==321) { // kaon
287 probTagK[1] = LinearInterpolation(PChild(1),kKBins,kKBinWidth,kKTagK);
288 probTagNid[1] = LinearInterpolation(PChild(1),kKBins,kKBinWidth,kKTagNid);
289 if((probTagNid[1]+probTagK[1])>1.) probTagNid[1] = 1.-probTagK[1];
290 probTagPi[1] = 1.-probTagNid[1]-probTagK[1];
291 probTagP[1] = 0.;
292 }
293 if(TMath::Abs(fPdg[1])==2212) { // proton
294 probTagP[1] = LinearInterpolation(PChild(1),kPBins,kPBinWidth,kPTagP);
295 probTagNid[1] = LinearInterpolation(PChild(1),kPBins,kPBinWidth,kPTagNid);
296 if((probTagNid[1]+probTagP[1])>1.) probTagNid[1] = 1.-probTagP[1];
297 probTagPi[1] = 1.-probTagNid[1]-probTagP[1];
298 probTagK[1] = 0.;
299 }
300
301 // assignement of the weights from PID
302 fWgtAD0 = probTagK[1]*(probTagPi[0]+probTagNid[0]);
303 fWgtAD0bar = probTagK[0]*(probTagPi[1]+probTagNid[1]);
304 fWgtBD0 = probTagPi[0]*probTagNid[1];
305 fWgtBD0bar = probTagPi[1]*probTagNid[0];
306 fWgtCD0 = probTagNid[0]*probTagNid[1];
307 fWgtCD0bar = probTagNid[0]*probTagNid[1];
308
309 // pt-dependent weight to reproduce pt distr. given by NLO QCD (MNR)
310 // [only for candidates with at least one track coming from a D0]
311 SetPtWgts();
312
313
314
315 /*
316 for(Int_t j=0;j<2;j++) cerr<<" PDG = "<<GetPdgChild(j)<<" p = "<<PChild(j)<<" TagPi = "<<ProbTagPi[j]<<" TagK = "<<ProbTagK[j]<<" TagNid = "<<ProbTagNid[j]<<endl;
317
318 cerr<<fWgtAD0<<" "<<fWgtAD0bar<<endl;
319 cerr<<fWgtBD0<<" "<<fWgtBD0bar<<endl;
320 cerr<<fWgtCD0<<" "<<fWgtCD0bar<<endl;
321
322 if(fWgtAD0<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n";
323 if(fWgtAD0bar<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n";
324 if(fWgtBD0<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n";
325 if(fWgtBD0bar<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n";
326 if(fWgtCD0<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n";
327 if(fWgtCD0bar<0.) cerr<<"AliD0toKpi::ComputeWgts() Negative weight!!!\n";
328 */
329
330 return;
331}
332//____________________________________________________________________________
333void AliD0toKpi::CorrectWgt4BR(Double_t factor) {
334
335 fWgtAD0 *= factor;
336 fWgtAD0bar *= factor;
337 fWgtBD0 *= factor;
338 fWgtBD0bar *= factor;
339 fWgtCD0 *= factor;
340 fWgtCD0bar *= factor;
341
342 return;
343}
344//____________________________________________________________________________
345void AliD0toKpi::SetPtWgts() {
346
347 if(TMath::Abs(fMum[0]) != 421 && TMath::Abs(fMum[1]) != 421 &&
348 TMath::Abs(fMum[0]) != 411 && TMath::Abs(fMum[1]) != 411) return;
349
350 Double_t ptWgt = 1.;
351 ptWgt = 2.05-0.47*Pt()+0.02*Pt()*Pt();
352 if(Pt() >= 5.) ptWgt = 0.56*TMath::Exp(-0.12*Pt());
353
354 fWgtAD0 *= ptWgt;
355 fWgtAD0bar *= ptWgt;
356 fWgtBD0 *= ptWgt;
357 fWgtBD0bar *= ptWgt;
358 fWgtCD0 *= ptWgt;
359 fWgtCD0bar *= ptWgt;
360
361 return;
362}
363//____________________________________________________________________________
364void AliD0toKpi::GetWgts(Double_t &WgtD0,Double_t &WgtD0bar,Option_t *sample) const {
365
366 const char *sampleA = strstr(sample,"A");
367 const char *sampleB = strstr(sample,"B");
368 const char *sampleC = strstr(sample,"C");
369
370 if(sampleA) { WgtD0 = fWgtAD0; WgtD0bar = fWgtAD0bar; }
371 if(sampleB) { WgtD0 = fWgtBD0; WgtD0bar = fWgtBD0bar; }
372 if(sampleC) { WgtD0 = fWgtCD0; WgtD0bar = fWgtCD0bar; }
373
374 if(fSignal) {
375 if(fMum[0]==421) WgtD0bar = 0.;
376 if(fMum[0]==-421) WgtD0 = 0.;
377 }
378
379 return;
380}
381//____________________________________________________________________________
382void AliD0toKpi::InvMass(Double_t &mD0,Double_t &mD0bar) const {
383
384 Double_t energy[2];
385
386 // D0 -> K- Pi+
387 energy[1] = TMath::Sqrt(kMK*kMK+PChild(1)*PChild(1));
388 energy[0] = TMath::Sqrt(kMPi*kMPi+PChild(0)*PChild(0));
389
390 mD0 = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-P()*P());
391
392
393 // D0bar -> K+ Pi-
394 energy[0] = TMath::Sqrt(kMK*kMK+PChild(0)*PChild(0));
395 energy[1] = TMath::Sqrt(kMPi*kMPi+PChild(1)*PChild(1));
396
397 mD0bar = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-P()*P());
398
399 return;
400
401}
402//________________________________________________________________
403Double_t AliD0toKpi::qT() const {
404
405 TVector3 mom0(fPx[0],fPy[0],fPz[0]);
406 TVector3 momD(Px(),Py(),Pz());
407
408 return mom0.Perp(momD);
409}
410//________________________________________________________________
411Double_t AliD0toKpi::qL(Int_t child) const {
412
413 Double_t qL;
414 TVector3 mom(fPx[child],fPy[child],fPz[child]);
415 TVector3 momD(Px(),Py(),Pz());
416
417 qL = mom.Dot(momD)/momD.Mag();
418
419 return qL ;
420}
421//________________________________________________________________
422void AliD0toKpi::CosThetaStar(Double_t &ctsD0,Double_t &ctsD0bar) const {
423
424 Double_t pStar = TMath::Sqrt(TMath::Power(kMD0*kMD0-kMK*kMK-kMPi*kMPi,2.)-4.*kMK*kMK*kMPi*kMPi)/(2.*kMD0);
425
426 Double_t beta = P()/Energy();
427 Double_t gamma = Energy()/kMD0;
428
429 ctsD0 = (qL(1)/gamma-beta*TMath::Sqrt(pStar*pStar+kMK*kMK))/pStar;
430// if(ctsD0 > 1.) { cerr<<"AliD0toKpi::CosThetaStar: > 1 "<<ctsD0<<"!\n"; }
431// if(ctsD0 < -1.) { cerr<<"AliD0toKpi::CosThetaStar: < -1 "<<ctsD0<<"!\n"; }
432
433 ctsD0bar = (qL(0)/gamma-beta*TMath::Sqrt(pStar*pStar+kMK*kMK))/pStar;
434// if(ctsD0bar > 1.) { cerr<<"AliD0toKpi::CosThetaStar: > 1 "<<ctsD0bar<<"!\n"; }
435// if(ctsD0bar < -1.) { cerr<<"AliD0toKpi::CosThetaStar: < -1 "<<ctsD0bar<<"!\n";}
436
437 return;
438}
439//____________________________________________________________________
440Bool_t AliD0toKpi::Select(const Double_t* cuts,Int_t& okD0,Int_t& okD0bar) const {
441//
442// This function compares the D0 with a set of cuts:
443//
444// cuts[0] = inv. mass half width [GeV]
445// cuts[1] = dca [micron]
446// cuts[2] = cosThetaStar
447// cuts[3] = pTK [GeV/c]
448// cuts[4] = pTPi [GeV/c]
449// cuts[5] = d0K [micron] upper limit!
450// cuts[6] = d0Pi [micron] upper limit!
451// cuts[7] = d0d0 [micron^2]
452// cuts[8] = cosThetaPoint
453//
454// If the the D0/D0bar doesn't pass the cuts it sets the weights to 0
455// If neither D0 nor D0bar pass the cuts return kFALSE
456//
457 Double_t mD0,mD0bar,ctsD0,ctsD0bar;
458 okD0=1; okD0bar=1;
459
460 if(PtChild(1) < cuts[3] || PtChild(0) < cuts[4]) okD0 = 0;
461 if(PtChild(0) < cuts[3] || PtChild(1) < cuts[4]) okD0bar = 0;
462 if(!okD0 && !okD0bar) return kFALSE;
463
464 if(TMath::Abs(Getd0Child(1)) > cuts[5] ||
465 TMath::Abs(Getd0Child(0)) > cuts[6]) okD0 = 0;
466 if(TMath::Abs(Getd0Child(0)) > cuts[6] ||
467 TMath::Abs(Getd0Child(1)) > cuts[5]) okD0bar = 0;
468 if(!okD0 && !okD0bar) return kFALSE;
469
470 if(GetDCA() > cuts[1]) { okD0 = okD0bar = 0; return kFALSE; }
471
472 InvMass(mD0,mD0bar);
473 if(TMath::Abs(mD0-kMD0) > cuts[0]) okD0 = 0;
474 if(TMath::Abs(mD0bar-kMD0) > cuts[0]) okD0bar = 0;
475 if(!okD0 && !okD0bar) return kFALSE;
476
477 CosThetaStar(ctsD0,ctsD0bar);
478 if(TMath::Abs(ctsD0) > cuts[2]) okD0 = 0;
479 if(TMath::Abs(ctsD0bar) > cuts[2]) okD0bar = 0;
480 if(!okD0 && !okD0bar) return kFALSE;
481
482 if(d0d0() > cuts[7]) { okD0 = okD0bar = 0; return kFALSE; }
483
484 if(CPta() < cuts[8]) { okD0 = okD0bar = 0; return kFALSE; }
485
486 return kTRUE;
487}
488
489
490
491
492
493
494