]> git.uio.no Git - u/mrichter/AliRoot.git/blame - FASTSIM/AliMUONFastTracking.cxx
git://git.uio.no / u / mrichter / AliRoot.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
test Id (Ivana)
[u/mrichter/AliRoot.git] / FASTSIM / AliMUONFastTracking.cxx
CommitLineData
6255180c 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
9edefa04 16/* $Id$ */
6255180c 17
041f7f97 18//-------------------------------------------------------------------------
19// Class AliMUONFastTracking
20//
21// Manager for the fast simulation of tracking in the muon spectrometer
22// This class reads the lookup tables containing the parameterization
23// of the deltap, deltatheta, deltaphi for different background levels
24// and provides the related smeared parameters.
25// Used by AliFastMuonTrackingEff, AliFastMuonTrackingAcc,
26// AliFastMuonTrackingRes.
27//-------------------------------------------------------------------------
28
6255180c 29#include <stdio.h>
9edefa04 30#include <stdlib.h>
6255180c 31#include <string.h>
9edefa04 32
6255180c 33#include <Riostream.h>
9edefa04 34#include <TF1.h>
35#include <TFile.h>
36#include <TH3.h>
37#include <TMath.h>
38#include <TRandom.h>
39#include <TSpline.h>
40
41#include "AliMUONFastTracking.h"
42#include "AliMUONFastTrackingEntry.h"
6255180c 43
44ClassImp(AliMUONFastTracking)
45
041f7f97 46
6255180c 47AliMUONFastTracking* AliMUONFastTracking::fgMUONFastTracking=NULL;
48
49static Double_t FitP(Double_t *x, Double_t *par){
50 Double_t dx = x[0] - par[0];
51 Double_t dx2 = x[0] - par[4];
52 Double_t sigma = par[1] * ( 1 + par[2] * dx);
53 if (sigma == 0) {
54
55 return 0.;
56 }
57 Double_t fasymm = TMath::Exp(-0.5 * dx * dx / (sigma * sigma));
58 Double_t sigma2 = par[1] * par[5];
59 Double_t fgauss = TMath::Exp(-0.5 * dx2 * dx2 / (sigma2 * sigma2));
d53fc881 60 Double_t value = fasymm + par[3] * fgauss;
9a226b7e 61 return TMath::Abs(value);
6255180c 62}
63
ffed2f34 64AliMUONFastTracking::AliMUONFastTracking(const AliMUONFastTracking & ft):
65 TObject(),
66 fNbinp(10),
67 fPmin(0.),
68 fPmax(200.),
69 fDeltaP((fPmax-fPmin)/fNbinp),
70 fNbintheta(10),
71 fThetamin(2.),
72 fThetamax(9.),
73 fDeltaTheta((fThetamax-fThetamin)/fNbintheta),
74 fNbinphi(10),
75 fPhimin(-180.),
76 fPhimax(180.),
77 fDeltaPhi((fPhimax-fPhimin)/fNbinphi),
78 fPrintLevel(1),
79 fBkg(0.),
80 fSpline(0),
81 fClusterFinder(kOld)
041f7f97 82{
83// Copy constructor
84 ft.Copy(*this);
85}
86
87
6255180c 88AliMUONFastTracking* AliMUONFastTracking::Instance()
89{
90// Set random number generator
91 if (fgMUONFastTracking) {
92 return fgMUONFastTracking;
93 } else {
94 fgMUONFastTracking = new AliMUONFastTracking();
95 return fgMUONFastTracking;
96 }
97}
98
ffed2f34 99AliMUONFastTracking::AliMUONFastTracking():
100 fNbinp(10),
101 fPmin(0.),
102 fPmax(200.),
103 fDeltaP((fPmax-fPmin)/fNbinp),
104 fNbintheta(10),
105 fThetamin(2.),
106 fThetamax(9.),
107 fDeltaTheta((fThetamax-fThetamin)/fNbintheta),
108 fNbinphi(10),
109 fPhimin(-180.),
110 fPhimax(180.),
111 fDeltaPhi((fPhimax-fPhimin)/fNbinphi),
112 fPrintLevel(1),
113 fBkg(0.),
114 fSpline(0),
115 fClusterFinder(kOld)
6255180c 116{
041f7f97 117//
118// constructor
119//
1e68a0c5 120 for (Int_t i = 0; i<20;i++) {
121 for (Int_t j = 0; j<20; j++) {
122 for (Int_t k = 0; k<20; k++) {
123 fFitp[i][j][k] = 0x0;
124 }
125 }
126 }
6255180c 127}
128
129void AliMUONFastTracking::Init(Float_t bkg)
130{
131 //
132 // Initialization
133 //
134 for (Int_t ip=0; ip< fNbinp; ip++){
135 for (Int_t itheta=0; itheta< fNbintheta; itheta++){
136 for (Int_t iphi=0; iphi< fNbinphi; iphi++){
137 fCurrentEntry[ip][itheta][iphi] = new AliMUONFastTrackingEntry;
138 for (Int_t ibkg=0; ibkg<4; ibkg++){
139 fEntry[ip][itheta][iphi][ibkg] = new AliMUONFastTrackingEntry;
140 }
141 }
142 }
143 }
144
145 char filename [100];
bae6da3c 146 if (fClusterFinder==kOld) snprintf (filename, 100, "$(ALICE_ROOT)/FASTSIM/data/MUONtrackLUT.root");
147 else snprintf (filename, 100, "$(ALICE_ROOT)/FASTSIM/data/MUONtrackLUT-AZ.root");
d53fc881 148
6255180c 149 TFile *file = new TFile(filename);
150 ReadLUT(file);
151 SetBackground(bkg);
d53fc881 152 UseSpline(0);
6255180c 153}
154
155
156void AliMUONFastTracking::ReadLUT(TFile* file)
157{
041f7f97 158 //
159 // read the lookup tables from file
160 //
6255180c 161 TH3F *heff[5][3], *hacc[5][3], *hmeanp, *hsigmap, *hsigma1p, *hchi2p;
162 TH3F *hnormg2, *hmeang2, *hsigmag2, *hmeantheta, *hsigmatheta, *hchi2theta;
163 TH3F *hmeanphi, *hsigmaphi, *hchi2phi;
164 char tag[40], tag2[40];
165
d53fc881 166 printf ("Reading parameters from LUT file %s...\n",file->GetName());
167
041f7f97 168 const Float_t kBkg[4] = {0, 0.5, 1, 2};
6255180c 169 for (Int_t ibkg=0; ibkg<4; ibkg++) {
bae6da3c 170 snprintf (tag, 40, "BKG%g",kBkg[ibkg]);
6255180c 171 file->cd(tag);
172 for (Int_t isplp = 0; isplp<kSplitP; isplp++) {
173 for (Int_t ispltheta = 0; ispltheta<kSplitTheta; ispltheta++) {
bae6da3c 174 snprintf (tag2, 40, "heff[%d][%d]",isplp,ispltheta);
6255180c 175 heff[isplp][ispltheta] = (TH3F*)gDirectory->Get(tag2);
bae6da3c 176 snprintf (tag2, 40, "hacc[%d][%d]",isplp,ispltheta);
6255180c 177 hacc[isplp][ispltheta] = (TH3F*)gDirectory->Get(tag2);
178 }
179 }
180 hmeanp = (TH3F*)gDirectory->Get("hmeanp");
181 hsigmap = (TH3F*)gDirectory->Get("hsigmap");
182 hsigma1p = (TH3F*)gDirectory->Get("hsigma1p");
183 hchi2p = (TH3F*)gDirectory->Get("hchi2p");
184 hnormg2 = (TH3F*)gDirectory->Get("hnormg2");
185 hmeang2 = (TH3F*)gDirectory->Get("hmeang2");
186 hsigmag2 = (TH3F*)gDirectory->Get("hsigmag2");
187 hmeantheta = (TH3F*)gDirectory->Get("hmeantheta");
188 hsigmatheta = (TH3F*)gDirectory->Get("hsigmatheta");
189 hchi2theta = (TH3F*)gDirectory->Get("hchi2theta");
190 hmeanphi = (TH3F*)gDirectory->Get("hmeanphi");
191 hsigmaphi = (TH3F*)gDirectory->Get("hsigmaphi");
192 hchi2phi = (TH3F*)gDirectory->Get("hchi2phi");
193
6255180c 194 for (Int_t ip=0; ip<fNbinp ;ip++) {
195 for (Int_t itheta=0; itheta<fNbintheta ;itheta++) {
196 for (Int_t iphi=0; iphi<fNbinphi ;iphi++) {
197 Float_t p = fPmin + fDeltaP * (ip + 0.5);
198 Float_t theta = fThetamin + fDeltaTheta * (itheta + 0.5);
199 Float_t phi = fPhimin + fDeltaPhi * (iphi + 0.5);
200
4ef9f58b 201 fEntry[ip][itheta][iphi][ibkg]->SetP(p);
202 fEntry[ip][itheta][iphi][ibkg]->SetMeanp(hmeanp->GetBinContent(ip+1,itheta+1,iphi+1));
203 fEntry[ip][itheta][iphi][ibkg]->SetSigmap(TMath::Abs(hsigmap->GetBinContent(ip+1,itheta+1,iphi+1)));
204 fEntry[ip][itheta][iphi][ibkg]->SetSigma1p(hsigma1p->GetBinContent(ip+1,itheta+1,iphi+1));
205 fEntry[ip][itheta][iphi][ibkg]->SetChi2p(hchi2p->GetBinContent(ip+1,itheta+1,iphi+1));
206 fEntry[ip][itheta][iphi][ibkg]->SetNormG2(hnormg2->GetBinContent(ip+1,itheta+1,iphi+1));
207 fEntry[ip][itheta][iphi][ibkg]->SetMeanG2(hmeang2->GetBinContent(ip+1,itheta+1,iphi+1));
208 if (ibkg == 0) fEntry[ip][itheta][iphi][ibkg]->SetSigmaG2(9999);
209 else fEntry[ip][itheta][iphi][ibkg]->SetSigmaG2(hsigmag2->GetBinContent(ip+1,itheta+1,iphi+1));
210 fEntry[ip][itheta][iphi][ibkg]->SetTheta(theta);
211 fEntry[ip][itheta][iphi][ibkg]->SetMeantheta(hmeantheta->GetBinContent(ip+1,itheta+1,iphi+1));
212 fEntry[ip][itheta][iphi][ibkg]->SetSigmatheta(TMath::Abs(hsigmatheta->GetBinContent(ip+1,itheta+1,iphi+1)));
213 fEntry[ip][itheta][iphi][ibkg]->SetChi2theta(hchi2theta->GetBinContent(ip+1,itheta+1,iphi+1));
214 fEntry[ip][itheta][iphi][ibkg]->SetPhi(phi);
215 fEntry[ip][itheta][iphi][ibkg]->SetMeanphi(hmeanphi->GetBinContent(ip+1,itheta+1,iphi+1));
216 fEntry[ip][itheta][iphi][ibkg]->SetSigmaphi(TMath::Abs(hsigmaphi->GetBinContent(ip+1,itheta+1,iphi+1)));
217 fEntry[ip][itheta][iphi][ibkg]->SetChi2phi(hchi2phi->GetBinContent(ip+1,itheta+1,iphi+1));
6255180c 218 for (Int_t i=0; i<kSplitP; i++) {
219 for (Int_t j=0; j<kSplitTheta; j++) {
4ef9f58b 220 fEntry[ip][itheta][iphi][ibkg]->SetAcc(i,j,hacc[i][j]->GetBinContent(ip+1,itheta+1,iphi+1));
221 fEntry[ip][itheta][iphi][ibkg]->SetEff(i,j,heff[i][j]->GetBinContent(ip+1,itheta+1,iphi+1));
6255180c 222 }
223 }
224 } // iphi
225 } // itheta
226 } // ip
227 } // ibkg
228
229 TGraph *graph = new TGraph(3);
230 TF1 *f = new TF1("f","[0]+[1]*x");
231
232 for (Int_t ip=0; ip< fNbinp; ip++){
233 for (Int_t itheta=0; itheta< fNbintheta; itheta++){
234 for (Int_t iphi=0; iphi< fNbinphi; iphi++){
4ef9f58b 235 graph->SetPoint(0,0.5,fEntry[ip][itheta][iphi][1]->GetSigmaG2());
236 graph->SetPoint(1,1,fEntry[ip][itheta][iphi][2]->GetSigmaG2());
237 graph->SetPoint(2,2,fEntry[ip][itheta][iphi][3]->GetSigmaG2());
6255180c 238 graph->Fit("f","q");
4ef9f58b 239 fEntry[ip][itheta][iphi][0]->SetSigmaG2(f->Eval(0));
6255180c 240 }
241 }
242 }
243 f->Delete();
244 graph->Delete();
245 printf ("parameters read. \n");
246}
247
248void AliMUONFastTracking::GetBinning(Int_t &nbinp, Float_t &pmin, Float_t &pmax,
249 Int_t &nbintheta, Float_t &thetamin,
250 Float_t &thetamax,
041f7f97 251 Int_t &nbinphi, Float_t &phimin, Float_t &phimax) const
6255180c 252{
041f7f97 253 //
254 // gets the binning for the discrete parametrizations in the lookup table
255 //
6255180c 256 nbinp = fNbinp;
257 pmin = fPmin;
258 pmax = fPmax;
259 nbintheta = fNbintheta;
260 thetamin = fThetamin;
261 thetamax = fThetamax;
262 nbinphi = fNbinphi;
263 phimin = fPhimin;
264 phimax = fPhimax;
265}
266
267
268void AliMUONFastTracking::GetIpIthetaIphi(Float_t p, Float_t theta, Float_t phi,
269 Int_t charge, Int_t &ip, Int_t &itheta,
041f7f97 270 Int_t &iphi) const
6255180c 271{
041f7f97 272 //
273 // gets the id of the cells in the LUT for a given (p,theta,phi, charge)
274 //
6255180c 275 if (charge < 0) phi = -phi;
276 ip = Int_t (( p - fPmin ) / fDeltaP);
277 itheta = Int_t (( theta - fThetamin ) / fDeltaTheta);
278 iphi = Int_t (( phi - fPhimin ) / fDeltaPhi);
279
1e68a0c5 280
d53fc881 281 if (ip< 0) ip = 0;
282 if (ip>= fNbinp) ip = fNbinp-1;
283 if (itheta< 0) itheta = 0;
284 if (itheta>= fNbintheta) itheta = fNbintheta-1;
6255180c 285
d53fc881 286 if (iphi< 0) iphi = 0;
287 if (iphi>= fNbinphi) iphi = fNbinphi-1;
6255180c 288}
289
290void AliMUONFastTracking::GetSplit(Int_t ip, Int_t itheta,
041f7f97 291 Int_t &nSplitP, Int_t &nSplitTheta) const
292{
293 //
294 // the first cell is splitted in more bins for theta and momentum
295 // parameterizations. Get the number of divisions for the splitted bins
296 //
6255180c 297 if (ip==0) nSplitP = 5;
298 else nSplitP = 2;
299 if (itheta==0) nSplitTheta = 3;
300 else nSplitTheta = 1;
301}
302
303Float_t AliMUONFastTracking::Efficiency(Float_t p, Float_t theta,
304 Float_t phi, Int_t charge){
041f7f97 305 //
306 // gets the tracking efficiency
307 //
6255180c 308 Int_t ip=0, itheta=0, iphi=0;
309 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
310 Int_t nSplitP, nSplitTheta;
311 GetSplit(ip,itheta,nSplitP,nSplitTheta);
312
313 Float_t dp = p - fPmin;
314 Int_t ibinp = Int_t(nSplitP*(dp - fDeltaP * Int_t(dp / fDeltaP))/fDeltaP);
315 Float_t dtheta = theta - fThetamin;
316 Int_t ibintheta = Int_t(nSplitTheta*(dtheta - fDeltaTheta * Int_t(dtheta / fDeltaTheta))/fDeltaTheta);
4ef9f58b 317 Float_t eff = fCurrentEntry[ip][itheta][iphi]->GetEff(ibinp,ibintheta);
6255180c 318 return eff;
319}
320
321Float_t AliMUONFastTracking::Acceptance(Float_t p, Float_t theta,
322 Float_t phi, Int_t charge){
041f7f97 323 //
324 // gets the geometrical acceptance
325 //
6255180c 326 if (theta<fThetamin || theta>fThetamax) return 0;
327
328 Int_t ip=0, itheta=0, iphi=0;
329 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
330 Int_t nSplitP, nSplitTheta;
331 GetSplit(ip,itheta,nSplitP,nSplitTheta);
332 // central value and corrections with spline
333
334 Float_t dp = p - fPmin;
335 Int_t ibinp = Int_t(nSplitP*(dp - fDeltaP * Int_t(dp / fDeltaP))/fDeltaP);
336 Float_t dtheta = theta - fThetamin;
337 Int_t ibintheta = Int_t(nSplitTheta*(dtheta - fDeltaTheta * Int_t(dtheta / fDeltaTheta))/fDeltaTheta);
4ef9f58b 338 Float_t acc = fCurrentEntry[ip][itheta][iphi]->GetAcc(ibinp,ibintheta);
6255180c 339 return acc;
340}
341
342Float_t AliMUONFastTracking::MeanP(Float_t p, Float_t theta,
041f7f97 343 Float_t phi, Int_t charge) const
6255180c 344{
041f7f97 345 //
346 // gets the mean value of the prec-pgen distribution
347 //
6255180c 348 Int_t ip=0, itheta=0, iphi=0;
349 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
4ef9f58b 350 return fCurrentEntry[ip][itheta][iphi]->GetMeanp();
6255180c 351}
352
353Float_t AliMUONFastTracking::SigmaP(Float_t p, Float_t theta,
041f7f97 354 Float_t phi, Int_t charge) const
6255180c 355{
041f7f97 356 //
357 // gets the width of the prec-pgen distribution
358 //
6255180c 359 Int_t ip=0, itheta=0, iphi=0;
360 Int_t index;
361 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
362 // central value and corrections with spline
4ef9f58b 363 Float_t sigmap = fCurrentEntry[ip][itheta][iphi]->GetSigmap();
6255180c 364 if (!fSpline) return sigmap;
365 // corrections vs p, theta, phi
366 index = iphi + fNbinphi * itheta;
367 Double_t xmin,ymin,xmax,ymax;
368 Float_t frac1 = fSplineSigmap[index][0]->Eval(p)/sigmap;
369
370 if (p>fPmax-fDeltaP/2.) {
4ef9f58b 371 Float_t s1 = fCurrentEntry[fNbinp-1][itheta][iphi]->GetSigmap();
372 Float_t s2 = fCurrentEntry[fNbinp-2][itheta][iphi]->GetSigmap();
373 Float_t s3 = fCurrentEntry[fNbinp-3][itheta][iphi]->GetSigmap();
6255180c 374 Float_t p1 = fDeltaP * (fNbinp - 1 + 0.5) + fPmin;
375 Float_t p2 = fDeltaP * (fNbinp - 2 + 0.5) + fPmin;
376 Float_t p3 = fDeltaP * (fNbinp - 3 + 0.5) + fPmin;
377 Float_t p12 = p1 * p1, p22 = p2 * p2, p32 = p3 * p3;
378 Float_t d = p12*p2 + p1*p32 + p22*p3 - p32*p2 - p3*p12 - p22*p1;
379 Float_t a = (s1*p2 + p1*s3 + s2*p3 - s3*p2 - p3*s1 - s2*p1) / d;
380 Float_t b = (p12*s2 + s1*p32 + p22*s3 - p32*s2 - s3*p12 - p22*s1)/d;
381 Float_t c = (p12*p2*s3 + p1*p32*s2 + p22*p3*s1
382 - p32*p2*s1 - p3*p12*s2 - p22*p1*s3) / d;
383 Float_t sigma = a * p * p + b * p + c;
384 frac1 = sigma/sigmap;
385 }
386 index = iphi + fNbinphi * ip;
387 fSplineEff[index][1]->GetKnot(0,xmin,ymin);
388 fSplineEff[index][1]->GetKnot(9,xmax,ymax);
389 if (theta>xmax) theta = xmax;
390 Float_t frac2 = fSplineSigmap[index][1]->Eval(theta)/sigmap;
391 index = itheta + fNbintheta * ip;
392 fSplineEff[index][2]->GetKnot(0,xmin,ymin);
393 fSplineEff[index][2]->GetKnot(9,xmax,ymax);
394 if (phi>xmax) phi = xmax;
395 Float_t frac3 = fSplineSigmap[index][2]->Eval(phi)/sigmap;
396 Float_t sigmatot = sigmap * frac1 * frac2 * frac3;
397 if (sigmatot<0) sigmatot = sigmap;
398 return sigmatot;
399}
400
401Float_t AliMUONFastTracking::Sigma1P(Float_t p, Float_t theta,
041f7f97 402 Float_t phi, Int_t charge) const
6255180c 403{
041f7f97 404 //
405 // gets the width correction of the prec-pgen distribution (see FitP)
406 //
6255180c 407 Int_t ip=0, itheta=0, iphi=0;
408 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
409 if (p>fPmax) {
410 // linear extrapolation of sigmap for p out of range
4ef9f58b 411 Float_t s1 = fCurrentEntry[fNbinp-1][itheta][iphi]->GetSigma1p();
412 Float_t s2 = fCurrentEntry[fNbinp-2][itheta][iphi]->GetSigma1p();
6255180c 413 Float_t p1 = fDeltaP * (fNbinp - 1 + 0.5) + fPmin;
414 Float_t p2 = fDeltaP * (fNbinp - 2 + 0.5) + fPmin;
415 Float_t sigma = 1./(p1-p2) * ( (s1-s2)*p + (s2-s1)*p1 + s1*(p1-p2) );
416 return sigma;
417 }
4ef9f58b 418 else return fCurrentEntry[ip][itheta][iphi]->GetSigma1p();
6255180c 419}
420
421Float_t AliMUONFastTracking::NormG2(Float_t p, Float_t theta,
041f7f97 422 Float_t phi, Int_t charge) const
6255180c 423{
041f7f97 424 //
425 // gets the relative normalization of the background
426 // (gaussian) component in the prec-pgen distribution
427 //
6255180c 428 Int_t ip=0, itheta=0, iphi=0;
429 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
430 if (p>fPmax) {
431 // linear extrapolation of sigmap for p out of range
4ef9f58b 432 Float_t s1 = fCurrentEntry[fNbinp-1][itheta][iphi]->GetNormG2();
433 Float_t s2 = fCurrentEntry[fNbinp-2][itheta][iphi]->GetNormG2();
6255180c 434 Float_t p1 = fDeltaP * (fNbinp - 1 + 0.5) + fPmin;
435 Float_t p2 = fDeltaP * (fNbinp - 2 + 0.5) + fPmin;
436 Float_t norm = 1./(p1-p2) * ( (s1-s2)*p + (s2-s1)*p1 + s1*(p1-p2) );
437 return norm;
438 }
4ef9f58b 439 else return fCurrentEntry[ip][itheta][iphi]->GetNormG2();
6255180c 440}
441
442Float_t AliMUONFastTracking::MeanG2(Float_t p, Float_t theta,
041f7f97 443 Float_t phi, Int_t charge) const
6255180c 444{
041f7f97 445 //
446 // gets the mean value of the background
447 // (gaussian) component in the prec-pgen distribution
448 //
6255180c 449 Int_t ip=0, itheta=0, iphi=0;
450 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
451 if (p>fPmax) {
452 // linear extrapolation of sigmap for p out of range
4ef9f58b 453 Float_t s1 = fCurrentEntry[fNbinp-1][itheta][iphi]->GetMeanG2();
454 Float_t s2 = fCurrentEntry[fNbinp-2][itheta][iphi]->GetMeanG2();
6255180c 455 Float_t p1 = fDeltaP * (fNbinp - 1 + 0.5) + fPmin;
456 Float_t p2 = fDeltaP * (fNbinp - 2 + 0.5) + fPmin;
457 Float_t norm = 1./(p1-p2) * ( (s1-s2)*p + (s2-s1)*p1 + s1*(p1-p2) );
458 return norm;
459 }
4ef9f58b 460 else return fCurrentEntry[ip][itheta][iphi]->GetMeanG2();
6255180c 461}
462
463Float_t AliMUONFastTracking::SigmaG2(Float_t p, Float_t theta,
041f7f97 464 Float_t phi, Int_t charge) const
6255180c 465{
041f7f97 466 //
467 // gets the width of the background
468 // (gaussian) component in the prec-pgen distribution
469 //
6255180c 470 Int_t ip=0, itheta=0, iphi=0;
471 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
472 if (p>fPmax) {
473 // linear extrapolation of sigmap for p out of range
4ef9f58b 474 Float_t s1 = fCurrentEntry[fNbinp-1][itheta][iphi]->GetSigmaG2();
475 Float_t s2 = fCurrentEntry[fNbinp-2][itheta][iphi]->GetSigmaG2();
6255180c 476 Float_t p1 = fDeltaP * (fNbinp - 1 + 0.5) + fPmin;
477 Float_t p2 = fDeltaP * (fNbinp - 2 + 0.5) + fPmin;
478 Float_t sigma = 1./(p1-p2) * ( (s1-s2)*p + (s2-s1)*p1 + s1*(p1-p2) );
479 return sigma;
480 }
4ef9f58b 481 else return fCurrentEntry[ip][itheta][iphi]->GetSigmaG2();
6255180c 482}
483
484
485Float_t AliMUONFastTracking::MeanTheta(Float_t p, Float_t theta,
041f7f97 486 Float_t phi, Int_t charge) const
6255180c 487{
041f7f97 488 //
489 // gets the mean value of the thetarec-thetagen distribution
490 //
6255180c 491 Int_t ip=0, itheta=0, iphi=0;
492 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
4ef9f58b 493 return fCurrentEntry[ip][itheta][iphi]->GetMeantheta();
6255180c 494}
495
041f7f97 496Float_t AliMUONFastTracking::SigmaTheta(Float_t p, Float_t theta,
497 Float_t phi, Int_t charge) const
498{
499 //
500 // gets the width of the thetarec-thetagen distribution
501 //
6255180c 502 Int_t ip=0, itheta=0, iphi=0;
503 Int_t index;
504 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
505 // central value and corrections with spline
4ef9f58b 506 Float_t sigmatheta = fCurrentEntry[ip][itheta][iphi]->GetSigmatheta();
6255180c 507 if (!fSpline) return sigmatheta;
508 // corrections vs p, theta, phi
509 index = iphi + fNbinphi * itheta;
510 Double_t xmin,ymin,xmax,ymax;
511 Float_t frac1 = fSplineSigmatheta[index][0]->Eval(p)/sigmatheta;
512 if (p>fPmax-fDeltaP/2.) {
513 // linear extrapolation of sigmap for p out of range
4ef9f58b 514 Float_t s1 = fCurrentEntry[fNbinp-1][itheta][iphi]->GetSigmatheta();
515 Float_t s2 = fCurrentEntry[fNbinp-2][itheta][iphi]->GetSigmatheta();
6255180c 516 Float_t p1 = fDeltaP * (fNbinp - 1 + 0.5) + fPmin;
517 Float_t p2 = fDeltaP * (fNbinp - 2 + 0.5) + fPmin;
518 Float_t sigma = 1./(p1-p2) * ( (s1-s2)*p + (s2-s1)*p1 + s1*(p1-p2) );
519 frac1=sigma/sigmatheta;
520 }
521 index = iphi + fNbinphi * ip;
522 fSplineEff[index][1]->GetKnot(0,xmin,ymin);
523 fSplineEff[index][1]->GetKnot(9,xmax,ymax);
524 if (theta>xmax) theta = xmax;
525 Float_t frac2 = fSplineSigmatheta[index][1]->Eval(theta)/sigmatheta;
526 index = itheta + fNbintheta * ip;
527 fSplineEff[index][2]->GetKnot(0,xmin,ymin);
528 fSplineEff[index][2]->GetKnot(9,xmax,ymax);
529 if (phi>xmax) phi = xmax;
530 Float_t frac3 = fSplineSigmatheta[index][2]->Eval(phi)/sigmatheta;
531 return sigmatheta * frac1 * frac2 * frac3;
532}
533
534
535Float_t AliMUONFastTracking::MeanPhi(Float_t p, Float_t theta,
041f7f97 536 Float_t phi, Int_t charge) const
537{
538 //
539 // gets the mean value of the phirec-phigen distribution
540 //
6255180c 541 Int_t ip=0, itheta=0, iphi=0;
542 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
4ef9f58b 543 return fCurrentEntry[ip][itheta][iphi]->GetMeanphi();
6255180c 544}
545
546Float_t AliMUONFastTracking::SigmaPhi(Float_t p, Float_t theta,
547 Float_t phi, Int_t charge){
041f7f97 548 //
549 // gets the width of the phirec-phigen distribution
550 //
6255180c 551 Int_t ip=0, itheta=0, iphi=0;
552 Int_t index;
553 GetIpIthetaIphi(p,theta,phi,charge,ip,itheta,iphi);
554 // central value and corrections with spline
4ef9f58b 555 Float_t sigmaphi = fCurrentEntry[ip][itheta][iphi]->GetSigmaphi();
6255180c 556 if (!fSpline) return sigmaphi;
557 // corrections vs p, theta, phi
558 index = iphi + fNbinphi * itheta;
559 Float_t frac1 = fSplineSigmaphi[index][0]->Eval(p)/sigmaphi;
560 Double_t xmin,ymin,xmax,ymax;
561 if (p>fPmax-fDeltaP/2.) {
4ef9f58b 562 Float_t s1 = fCurrentEntry[fNbinp-1][itheta][iphi]->GetSigmaphi();
563 Float_t s2 = fCurrentEntry[fNbinp-2][itheta][iphi]->GetSigmaphi();
6255180c 564 Float_t p1 = fDeltaP * (fNbinp - 1 + 0.5) + fPmin;
565 Float_t p2 = fDeltaP * (fNbinp - 2 + 0.5) + fPmin;
566 Float_t sigma = 1./(p1-p2) * ( (s1-s2)*p + (s2-s1)*p1 + s1*(p1-p2) );
567 frac1 = sigma/sigmaphi;
568 }
569
570 index = iphi + fNbinphi * ip;
571 fSplineEff[index][1]->GetKnot(0,xmin,ymin);
572 fSplineEff[index][1]->GetKnot(9,xmax,ymax);
573 if (theta>xmax) theta = xmax;
574 Float_t frac2 = fSplineSigmaphi[index][1]->Eval(theta)/sigmaphi;
575 index = itheta + fNbintheta * ip;
576 fSplineEff[index][2]->GetKnot(0,xmin,ymin);
577 fSplineEff[index][2]->GetKnot(9,xmax,ymax);
578 if (phi>xmax) phi = xmax;
579 Float_t frac3 = fSplineSigmaphi[index][2]->Eval(phi)/sigmaphi;
580 return sigmaphi * frac1 * frac2 * frac3;
581}
582
583void AliMUONFastTracking::SetSpline(){
041f7f97 584 //
585 // sets the spline functions for a smooth behaviour of the parameters
586 // when going from one cell to another
587 //
6255180c 588 printf ("Setting spline functions...");
589 char splname[40];
590 Double_t x[20][3];
591 Double_t x2[50][3];
592 Int_t nbins[3] = {fNbinp, fNbintheta, fNbinphi};
593 Double_t xspl[20],yeff[50],ysigmap[20],ysigma1p[20];
594 Double_t yacc[50], ysigmatheta[20],ysigmaphi[20];
595 Double_t xsp2[50];
596 // let's calculate the x axis for p, theta, phi
597
598 Int_t i, ispline, ivar;
599 for (i=0; i< fNbinp; i++) x[i][0] = fPmin + fDeltaP * (i + 0.5);
600 for (i=0; i< fNbintheta; i++) x[i][1] = fThetamin + fDeltaTheta * (i + 0.5);
601 for (i=0; i< fNbinphi; i++) x[i][2] = fPhimin + fDeltaPhi * (i + 0.5);
602
603 for (i=0; i< 5 * fNbinp; i++) x2[i][0] = fPmin + fDeltaP * (i + 0.5)/5.;
604 for (i=0; i< 5 * fNbintheta; i++) x2[i][1] = fThetamin + fDeltaTheta * (i + 0.5)/5.;
605 for (i=0; i< 5 * fNbinphi; i++) x2[i][2] = fPhimin + fDeltaPhi * (i + 0.5)/5.;
606
607 // splines in p
608 ivar = 0;
609 for (i=0; i<nbins[ivar]; i++) xspl[i] = x[i][ivar];
610 for (i=0; i<5 * nbins[ivar]; i++) xsp2[i] = x2[i][ivar];
611 ispline=0;
612 for (Int_t itheta=0; itheta< fNbintheta; itheta++){
613 for (Int_t iphi=0; iphi< fNbinphi; iphi++){
614 for (Int_t ip=0; ip<fNbinp; ip++) {
4ef9f58b 615 ysigmap[ip] = fCurrentEntry[ip][itheta][iphi]->GetSigmap();
616 ysigma1p[ip] = fCurrentEntry[ip][itheta][iphi]->GetSigma1p();
617 ysigmatheta[ip] = fCurrentEntry[ip][itheta][iphi]->GetSigmatheta();
618 ysigmaphi[ip] = fCurrentEntry[ip][itheta][iphi]->GetSigmaphi();
6255180c 619 }
620 if (fPrintLevel>3) cout << " creating new spline " << splname << endl;
bae6da3c 621 snprintf (splname, 40, "fSplineEff[%d][%d]",ispline,ivar);
6255180c 622 fSplineEff[ispline][ivar] = new TSpline3(splname,xsp2,yeff,5 * nbins[ivar]);
bae6da3c 623 snprintf (splname, 40, "fSplineAcc[%d][%d]",ispline,ivar);
6255180c 624 fSplineAcc[ispline][ivar] = new TSpline3(splname,xsp2,yacc,5 * nbins[ivar]);
bae6da3c 625 snprintf (splname, 40, "fSplineSigmap[%d][%d]",ispline,ivar);
6255180c 626 fSplineSigmap[ispline][ivar] = new TSpline3(splname,xspl,ysigmap,nbins[ivar]);
bae6da3c 627 snprintf (splname, 40, "fSplineSigma1p[%d][%d]",ispline,ivar);
6255180c 628 fSplineSigma1p[ispline][ivar] = new TSpline3(splname,xspl,ysigma1p,nbins[ivar]);
bae6da3c 629 snprintf (splname, 40, "fSplineSigmatheta[%d][%d]",ispline,ivar);
6255180c 630 fSplineSigmatheta[ispline][ivar] = new TSpline3(splname,xspl,ysigmatheta,nbins[ivar]);
bae6da3c 631 snprintf (splname, 40, "fSplineSigmaphi[%d][%d]",ispline,ivar);
6255180c 632 fSplineSigmaphi[ispline][ivar] = new TSpline3(splname,xspl,ysigmaphi,nbins[ivar]);
633 ispline++;
634 }
635 }
636
637 ivar = 1;
638 for (i=0; i<nbins[ivar]; i++) xspl[i] = x[i][ivar];
639 ispline=0;
640 for (Int_t ip=0; ip<fNbinp; ip++) {
641 for (Int_t iphi=0; iphi< fNbinphi; iphi++){
642 for (Int_t itheta=0; itheta< fNbintheta; itheta++){
643 // for efficiency and acceptance let's take the central value
4ef9f58b 644 ysigmap[itheta] = fCurrentEntry[ip][itheta][iphi]->GetSigmap();
645 ysigma1p[itheta] = fCurrentEntry[ip][itheta][iphi]->GetSigma1p();
646 ysigmatheta[itheta] = fCurrentEntry[ip][itheta][iphi]->GetSigmatheta();
647 ysigmaphi[itheta] = fCurrentEntry[ip][itheta][iphi]->GetSigmaphi();
6255180c 648 }
649 if (fPrintLevel>3) cout << " creating new spline " << splname << endl;
bae6da3c 650 snprintf (splname, 40, "fSplineEff[%d][%d]",ispline,ivar);
6255180c 651 fSplineEff[ispline][ivar] = new TSpline3(splname,xspl,yeff, nbins[ivar]);
bae6da3c 652 snprintf (splname, 40, "fSplineAcc[%d][%d]",ispline,ivar);
6255180c 653 fSplineAcc[ispline][ivar] = new TSpline3(splname,xspl,yacc, nbins[ivar]);
bae6da3c 654 snprintf (splname, 40, "fSplineSigmap[%d][%d]",ispline,ivar);
6255180c 655 fSplineSigmap[ispline][ivar] = new TSpline3(splname,xspl,ysigmap,nbins[ivar]);
bae6da3c 656 snprintf (splname, 40, "fSplineSigma1p[%d][%d]",ispline,ivar);
6255180c 657 fSplineSigma1p[ispline][ivar] = new TSpline3(splname,xspl,ysigma1p,nbins[ivar]);
bae6da3c 658 snprintf (splname, 40, "fSplineSigmatheta[%d][%d]",ispline,ivar);
6255180c 659 fSplineSigmatheta[ispline][ivar] = new TSpline3(splname,xspl,ysigmatheta,nbins[ivar]);
bae6da3c 660 snprintf (splname, 40, "fSplineSigmaphi[%d][%d]",ispline,ivar);
6255180c 661 fSplineSigmaphi[ispline][ivar] = new TSpline3(splname,xspl,ysigmaphi,nbins[ivar]);
662 ispline++;
663 }
664 }
665
666 ivar = 2;
667 for (i=0; i<nbins[ivar]; i++) xspl[i] = x[i][ivar];
668 ispline=0;
669 for (Int_t ip=0; ip<fNbinp; ip++) {
670 for (Int_t itheta=0; itheta< fNbintheta; itheta++){
671 for (Int_t iphi=0; iphi< fNbinphi; iphi++){
672 // for efficiency and acceptance let's take the central value
4ef9f58b 673 ysigmap[iphi] = fCurrentEntry[ip][itheta][iphi]->GetSigmap();
674 ysigma1p[iphi] = fCurrentEntry[ip][itheta][iphi]->GetSigma1p();
675 ysigmatheta[iphi] = fCurrentEntry[ip][itheta][iphi]->GetSigmatheta();
676 ysigmaphi[iphi] = fCurrentEntry[ip][itheta][iphi]->GetSigmaphi();
6255180c 677 }
678 if (fPrintLevel>3) cout << " creating new spline " << splname << endl;
bae6da3c 679 snprintf (splname, 40, "fSplineEff[%d][%d]",ispline,ivar);
6255180c 680 fSplineEff[ispline][ivar] = new TSpline3(splname,xspl,yeff, nbins[ivar]);
bae6da3c 681 snprintf (splname, 40, "fSplineAcc[%d][%d]",ispline,ivar);
6255180c 682 fSplineAcc[ispline][ivar] = new TSpline3(splname,xspl,yacc, nbins[ivar]);
bae6da3c 683 snprintf (splname, 40, "fSplineSigmap[%d][%d]",ispline,ivar);
6255180c 684 fSplineSigmap[ispline][ivar] = new TSpline3(splname,xspl,ysigmap,nbins[ivar]);
bae6da3c 685 snprintf (splname, 40, "fSplineSigma1p[%d][%d]",ispline,ivar);
6255180c 686 fSplineSigma1p[ispline][ivar] = new TSpline3(splname,xspl,ysigma1p,nbins[ivar]);
bae6da3c 687 snprintf (splname, 40, "fSplineSigmatheta[%d][%d]",ispline,ivar);
6255180c 688 fSplineSigmatheta[ispline][ivar] = new TSpline3(splname,xspl,ysigmatheta,nbins[ivar]);
bae6da3c 689 snprintf (splname, 40, "fSplineSigmaphi[%d][%d]",ispline,ivar);
6255180c 690 fSplineSigmaphi[ispline][ivar] = new TSpline3(splname,xspl,ysigmaphi,nbins[ivar]);
691 ispline++;
692 }
693 }
694 printf ("...done\n");
695}
696
6255180c 697void AliMUONFastTracking::SetBackground(Float_t bkg){
041f7f97 698 //
6255180c 699 // linear interpolation of the parameters in the LUT between 2 values where
700 // the background has been actually calculated
041f7f97 701 //
6255180c 702 if (bkg>2) printf ("WARNING: unsafe extrapolation!\n");
703 fBkg = bkg;
704
041f7f97 705 Float_t bkgLevel[4] = {0, 0.5, 1, 2}; // bkg values for which LUT is calculated
6255180c 706 Int_t ibkg;
041f7f97 707 for (ibkg=0; ibkg<4; ibkg++) if ( bkg < bkgLevel[ibkg]) break;
6255180c 708 if (ibkg == 4) ibkg--;
709 if (ibkg == 0) ibkg++;
710
041f7f97 711 Float_t x0 = bkgLevel[ibkg-1];
712 Float_t x1 = bkgLevel[ibkg];
6255180c 713 Float_t x = (bkg - x0) / (x1 - x0);
714
715 Float_t y0, y1;
716
717 for (Int_t ip=0; ip< fNbinp; ip++){
718 for (Int_t itheta=0; itheta< fNbintheta; itheta++){
719 for (Int_t iphi=0; iphi< fNbinphi; iphi++){
4ef9f58b 720 fCurrentEntry[ip][itheta][iphi]->SetP(fEntry[ip][itheta][iphi][ibkg]->GetP());
721 fCurrentEntry[ip][itheta][iphi]->SetTheta(fEntry[ip][itheta][iphi][ibkg]->GetTheta());
722 fCurrentEntry[ip][itheta][iphi]->SetPhi(fEntry[ip][itheta][iphi][ibkg]->GetPhi());
723 fCurrentEntry[ip][itheta][iphi]->SetChi2p(-1);
724 fCurrentEntry[ip][itheta][iphi]->SetChi2theta(-1);
725 fCurrentEntry[ip][itheta][iphi]->SetChi2phi(-1);
726
727 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetMeanp();
728 y1 = fEntry[ip][itheta][iphi][ibkg]->GetMeanp();
729 fCurrentEntry[ip][itheta][iphi] ->SetMeanp((y1 - y0) * x + y0);
730 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetMeantheta();
731 y1 = fEntry[ip][itheta][iphi][ibkg]->GetMeantheta();
732 fCurrentEntry[ip][itheta][iphi] ->SetMeantheta((y1 - y0) * x +y0);
733 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetMeanphi();
734 y1 = fEntry[ip][itheta][iphi][ibkg]->GetMeanphi();
735 fCurrentEntry[ip][itheta][iphi] ->SetMeanphi((y1 - y0) * x + y0);
736 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetSigmap();
737 y1 = fEntry[ip][itheta][iphi][ibkg]->GetSigmap();
738 fCurrentEntry[ip][itheta][iphi] ->SetSigmap((y1 - y0) * x + y0);
739 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetSigmatheta();
740 y1 = fEntry[ip][itheta][iphi][ibkg]->GetSigmatheta();
741 fCurrentEntry[ip][itheta][iphi] ->SetSigmatheta((y1 - y0) * x+y0);
742 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetSigmaphi();
743 y1 = fEntry[ip][itheta][iphi][ibkg]->GetSigmaphi();
744 fCurrentEntry[ip][itheta][iphi] ->SetSigmaphi((y1 - y0) * x + y0);
745 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetSigma1p();
746 y1 = fEntry[ip][itheta][iphi][ibkg]->GetSigma1p();
747 fCurrentEntry[ip][itheta][iphi] ->SetSigma1p((y1 - y0) * x + y0);
748 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetNormG2();
749 y1 = fEntry[ip][itheta][iphi][ibkg]->GetNormG2();
750 fCurrentEntry[ip][itheta][iphi] ->SetNormG2((y1 - y0) * x + y0);
751 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetMeanG2();
752 y1 = fEntry[ip][itheta][iphi][ibkg]->GetMeanG2();
753 fCurrentEntry[ip][itheta][iphi] ->SetMeanG2((y1 - y0) * x + y0);
6255180c 754
4ef9f58b 755 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetSigmaG2();
756 y1 = fEntry[ip][itheta][iphi][ibkg]->GetSigmaG2();
757 fCurrentEntry[ip][itheta][iphi] ->SetSigmaG2((y1 - y0) * x + y0);
6255180c 758 for (Int_t i=0; i<kSplitP; i++) {
759 for (Int_t j=0; j<kSplitTheta; j++) {
4ef9f58b 760 fCurrentEntry[ip][itheta][iphi]->SetAcc(i,j,fEntry[ip][itheta][iphi][ibkg]->GetAcc(i,j));
761 y0 = fEntry[ip][itheta][iphi][ibkg-1]->GetEff(i,j);
762 y1 = fEntry[ip][itheta][iphi][ibkg]->GetEff(i,j);
763 fCurrentEntry[ip][itheta][iphi]->SetEff(i,j, (y1 - y0) * x + y0);
6255180c 764 }
765 }
766 }
767 }
768 }
769 SetSpline();
770}
771
d53fc881 772TF1* AliMUONFastTracking::GetFitP(Int_t ip,Int_t itheta,Int_t iphi) {
041f7f97 773 // gets the correct prec-pgen distribution for a given LUT cell
c6ba3ff4 774 if (!fFitp[ip][itheta][iphi]) {
775 char name[256];
bae6da3c 776 snprintf(name, 256, "fit_%d_%d_%d", ip, itheta, iphi);
c6ba3ff4 777 fFitp[ip][itheta][iphi] = new TF1(name ,FitP,-20.,20.,6);
d53fc881 778 fFitp[ip][itheta][iphi]->SetNpx(500);
1e68a0c5 779 fFitp[ip][itheta][iphi]->SetParameters(0.,0.,0.,0.,0.,0.);
d53fc881 780 }
781 return fFitp[ip][itheta][iphi];
782}
6255180c 783
041f7f97 784AliMUONFastTracking& AliMUONFastTracking::operator=(const AliMUONFastTracking& rhs)
785{
786// Assignment operator
787 rhs.Copy(*this);
788 return *this;
789}
790
15a060e4 791void AliMUONFastTracking::Copy(TObject&) const
041f7f97 792{
793 //
794 // Copy
795 //
796 Fatal("Copy","Not implemented!\n");
797}
6255180c 798
799
800
801
802
803
804
805