Improved cuts for the reconstruction of V0s (M.Ivanov)
[u/mrichter/AliRoot.git] / PHOS / AliPHOSPIDv1.cxx
CommitLineData
6ad0bfa0 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
b2a60966 16/* $Id$ */
17
6ad0bfa0 18//_________________________________________________________________________
b2a60966 19// Implementation version v1 of the PHOS particle identifier
7acf6008 20// Particle identification based on the
148b2bba 21// - RCPV: distance from CPV recpoint to EMCA recpoint.
22// - TOF
23// - PCA: Principal Components Analysis..
24// The identified particle has an identification number corresponding
25// to a 9 bits number:
bc0c084c 26// -Bit 0 to 2: bit set if RCPV > CpvEmcDistance (each bit corresponds
148b2bba 27// to a different efficiency-purity point of the photon identification)
bc0c084c 28// -Bit 3 to 5: bit set if TOF < TimeGate (each bit corresponds
148b2bba 29// to a different efficiency-purity point of the photon identification)
30// -Bit 6 to 9: bit set if Principal Components are
50739f15 31// inside an ellipse defined by the parameters a, b, c, x0 and y0.
148b2bba 32// (each bit corresponds to a different efficiency-purity point of the
50739f15 33// photon identification)
34// The PCA (Principal components analysis) needs a file that contains
35// a previous analysis of the correlations between the particles. This
bc0c084c 36// file is $ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root. Analysis done for
50739f15 37// energies between 0.5 and 100 GeV.
9fa5f1d0 38// A calibrated energy is calculated. The energy of the reconstructed
50739f15 39// cluster is corrected with the formula A + B * E + C * E^2, whose
bc0c084c 40// parameters where obtained through the study of the reconstructed
50739f15 41// energy distribution of monoenergetic photons.
a4e98857 42//
bc0c084c 43// All the parameters (RCPV(2 rows-3 columns),TOF(1r-3c),PCA(5r-4c)
50739f15 44// and calibration(1r-3c))are stored in a file called
45// $ALICE_ROOT/PHOS/Parameters.dat. Each time that AliPHOSPIDv1 is
bc0c084c 46// initialized, this parameters are copied to a Matrix (9,4), a
50739f15 47// TMatrixD object.
7acf6008 48//
a4e98857 49// use case:
50739f15 50// root [0] AliPHOSPIDv1 * p = new AliPHOSPIDv1("galice1.root")
a4e98857 51// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
50739f15 52// // reading headers from file galice1.root and create RecParticles
53 // TrackSegments and RecPoints are used
54// // set file name for the branch RecParticles
f0a4c9e9 55// root [1] p->ExecuteTask("deb all time")
50739f15 56// // available options
57// // "deb" - prints # of reconstructed particles
58// // "deb all" - prints # and list of RecParticles
59// // "time" - prints benchmarking results
7acf6008 60//
50739f15 61// root [2] AliPHOSPIDv1 * p2 = new AliPHOSPIDv1("galice1.root","v1",kTRUE)
148b2bba 62// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
50739f15 63// //Split mode.
f0a4c9e9 64// root [3] p2->ExecuteTask()
65//
50739f15 66
f0a4c9e9 67
7acf6008 68//*-- Author: Yves Schutz (SUBATECH) & Gines Martinez (SUBATECH) &
148b2bba 69// Gustavo Conesa April 2002
50739f15 70// PCA redesigned by Gustavo Conesa October 2002:
71// The way of using the PCA has changed. Instead of 2
72// files with the PCA, each one with different energy ranges
73// of application, we use the wide one (0.5-100 GeV), and instead
bc0c084c 74// of fixing 3 ellipses for different ranges of energy, it has been
50739f15 75// studied the dependency of the ellipses parameters with the
76// energy, and they are implemented in the code as a funtion
77// of the energy.
78//
79//
80//
6ad0bfa0 81// --- ROOT system ---
7acf6008 82#include "TROOT.h"
83#include "TTree.h"
84#include "TFile.h"
e3817e5f 85#include "TF2.h"
86#include "TFormula.h"
87#include "TCanvas.h"
88#include "TFolder.h"
7acf6008 89#include "TSystem.h"
90#include "TBenchmark.h"
148b2bba 91#include "TMatrixD.h"
92#include "TPrincipal.h"
e3817e5f 93#include "TSystem.h"
148b2bba 94
6ad0bfa0 95// --- Standard library ---
96
75a6835b 97
6ad0bfa0 98// --- AliRoot header files ---
99
7acf6008 100#include "AliGenerator.h"
e3817e5f 101#include "AliPHOS.h"
26d4b141 102#include "AliPHOSPIDv1.h"
e3817e5f 103#include "AliPHOSClusterizerv1.h"
d956e9b7 104#include "AliPHOSEmcRecPoint.h"
6ad0bfa0 105#include "AliPHOSTrackSegment.h"
e3817e5f 106#include "AliPHOSTrackSegmentMakerv1.h"
6ad0bfa0 107#include "AliPHOSRecParticle.h"
7b7c1533 108#include "AliPHOSGeometry.h"
109#include "AliPHOSGetter.h"
6ad0bfa0 110
26d4b141 111ClassImp( AliPHOSPIDv1)
6ad0bfa0 112
6ad0bfa0 113//____________________________________________________________________________
1cb7c1ee 114AliPHOSPIDv1::AliPHOSPIDv1():AliPHOSPID()
115{
a4e98857 116 // default ctor
148b2bba 117
8d0f3f77 118 InitParameters() ;
92f521a9 119 fDefaultInit = kTRUE ;
7acf6008 120}
121
122//____________________________________________________________________________
88cb7938 123AliPHOSPIDv1::AliPHOSPIDv1(const AliPHOSPIDv1 & pid ):AliPHOSPID(pid)
581354c5 124{
386aef34 125 // ctor
581354c5 126 InitParameters() ;
581354c5 127 Init() ;
581354c5 128
129}
130
131//____________________________________________________________________________
88cb7938 132AliPHOSPIDv1::AliPHOSPIDv1(const TString alirunFileName, const TString eventFolderName):AliPHOSPID(alirunFileName, eventFolderName)
7acf6008 133{
a4e98857 134 //ctor with the indication on where to look for the track segments
7b7c1533 135
8d0f3f77 136 InitParameters() ;
2bd5457f 137 Init() ;
92f521a9 138 fDefaultInit = kFALSE ;
7acf6008 139}
7b7c1533 140
7acf6008 141//____________________________________________________________________________
142AliPHOSPIDv1::~AliPHOSPIDv1()
143{
79bb1b62 144 // dtor
9fa5f1d0 145
e3817e5f 146 delete [] fX ; // Principal input
147 delete [] fPPhoton ; // Photon Principal components
148 delete [] fPPi0 ; // Pi0 Principal components
7acf6008 149}
148b2bba 150//____________________________________________________________________________
a496c46c 151const TString AliPHOSPIDv1::BranchName() const
152{
88cb7938 153
154 return GetName() ;
a496c46c 155}
156
157//____________________________________________________________________________
148b2bba 158void AliPHOSPIDv1::Init()
159{
160 // Make all memory allocations that are not possible in default constructor
161 // Add the PID task to the list of PHOS tasks
a496c46c 162
88cb7938 163 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle(), fEventFolderName.Data()) ;
164
165 if ( !gime->PID() )
166 gime->PostPID(this) ;
148b2bba 167}
8d0f3f77 168
169//____________________________________________________________________________
170void AliPHOSPIDv1::InitParameters()
171{
e3817e5f 172 // Initialize PID parameters
8d0f3f77 173 fRecParticlesInRun = 0 ;
8d0f3f77 174 fNEvent = 0 ;
8d0f3f77 175 fRecParticlesInRun = 0 ;
9fa5f1d0 176 SetParameters() ; // fill the parameters matrix from parameters file
eabde521 177 SetEventRange(0,-1) ;
8d0f3f77 178}
179
88cb7938 180//________________________________________________________________________
eabde521 181void AliPHOSPIDv1::Exec(Option_t *option)
88cb7938 182{
eabde521 183 // Steering method to perform particle reconstruction and identification
184 // for the event range from fFirstEvent to fLastEvent.
185 // This range is optionally set by SetEventRange().
186 // if fLastEvent=-1 (by default), then process events until the end.
88cb7938 187
188 if(strstr(option,"tim"))
189 gBenchmark->Start("PHOSPID");
190
191 if(strstr(option,"print")) {
192 Print() ;
193 return ;
194 }
195
196
fb43ada4 197 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle()) ;
88cb7938 198
71cee46d 199 if (fLastEvent == -1)
200 fLastEvent = gime->MaxEvent() - 1 ;
201 else
202 fLastEvent = TMath::Min(fLastEvent,gime->MaxEvent());
eabde521 203 Int_t nEvents = fLastEvent - fFirstEvent + 1;
88cb7938 204
71cee46d 205 Int_t ievent ;
206 for (ievent = fFirstEvent; ievent <= fLastEvent; ievent++) {
88cb7938 207 gime->Event(ievent,"TR") ;
208 if(gime->TrackSegments() && //Skip events, where no track segments made
209 gime->TrackSegments()->GetEntriesFast()) {
210 MakeRecParticles() ;
90cceaf6 211 WriteRecParticles();
88cb7938 212 if(strstr(option,"deb"))
213 PrintRecParticles(option) ;
214 //increment the total number of rec particles per run
215 fRecParticlesInRun += gime->RecParticles()->GetEntriesFast() ;
216 }
217 }
218 if(strstr(option,"tim")){
219 gBenchmark->Stop("PHOSPID");
220 Info("Exec", "took %f seconds for PID %f seconds per event",
221 gBenchmark->GetCpuTime("PHOSPID"),
eabde521 222 gBenchmark->GetCpuTime("PHOSPID")/nEvents) ;
88cb7938 223 }
224
225 Unload();
226}
227
1cb7c1ee 228//____________________________________________________________________________
e3817e5f 229const TString AliPHOSPIDv1::GetFileNamePrincipal(TString particle) const
148b2bba 230{
e3817e5f 231 //Get file name that contains the PCA for a particle ("photon or pi0")
232 particle.ToLower();
233 TString name;
234 if (particle=="photon") name = fFileNamePrincipalPhoton ;
235 else if (particle=="pi0" ) name = fFileNamePrincipalPi0 ;
236 else Error("GetFileNamePrincipal","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
237 return name;
238}
bc0c084c 239
e3817e5f 240//____________________________________________________________________________
fc7e2f43 241Float_t AliPHOSPIDv1::GetParameterCalibration(Int_t i) const
e3817e5f 242{
243 // Get the i-th parameter "Calibration"
244 Float_t param = 0.;
245 if (i>2 || i<0)
246 Error("GetParameterCalibration","Invalid parameter number: %d",i);
9fa5f1d0 247 else
e3817e5f 248 param = (*fParameters)(0,i);
249 return param;
250}
bc0c084c 251
e3817e5f 252//____________________________________________________________________________
fc7e2f43 253Float_t AliPHOSPIDv1::GetCalibratedEnergy(Float_t e) const
88cb7938 254{
255// It calibrates Energy depending on the recpoint energy.
256// The energy of the reconstructed cluster is corrected with
257// the formula A + B* E + C* E^2, whose parameters where obtained
258// through the study of the reconstructed energy distribution of
259// monoenergetic photons.
260
261 Float_t p[]={0.,0.,0.};
262 for (Int_t i=0; i<3; i++) p[i] = GetParameterCalibration(i);
263 Float_t enerec = p[0] + p[1]*e + p[2]*e*e;
264 return enerec ;
265
266}
267
268//____________________________________________________________________________
fc7e2f43 269Float_t AliPHOSPIDv1::GetParameterCpv2Emc(Int_t i, TString axis) const
e3817e5f 270{
271 // Get the i-th parameter "CPV-EMC distance" for the specified axis
272 Float_t param = 0.;
273 if(i>2 || i<0)
274 Error("GetParameterCpv2Emc","Invalid parameter number: %d",i);
275 else {
276 axis.ToLower();
277 if (axis == "x") param = (*fParameters)(1,i);
278 else if (axis == "z") param = (*fParameters)(2,i);
279 else Error("GetParameterCpv2Emc","Invalid axis name: %s",axis.Data());
280 }
281 return param;
282}
283
284//____________________________________________________________________________
fc7e2f43 285Float_t AliPHOSPIDv1::GetCpv2EmcDistanceCut(TString axis, Float_t e) const
e3817e5f 286{
88cb7938 287 // Get CpvtoEmcDistance Cut depending on the cluster energy, axis and
288 // Purity-Efficiency point
289
290 axis.ToLower();
291 Float_t p[]={0.,0.,0.};
292 for (Int_t i=0; i<3; i++) p[i] = GetParameterCpv2Emc(i,axis);
293 Float_t sig = p[0] + TMath::Exp(p[1] - p[2]*e);
294 return sig;
e3817e5f 295}
296
88cb7938 297//____________________________________________________________________________
fc7e2f43 298Float_t AliPHOSPIDv1::GetEllipseParameter(TString particle, TString param, Float_t e) const
88cb7938 299{
300 // Calculates the parameter param of the ellipse
e3817e5f 301
302 particle.ToLower();
303 param. ToLower();
88cb7938 304 Float_t p[4]={0.,0.,0.,0.};
305 Float_t value = 0.0;
306 for (Int_t i=0; i<4; i++) p[i] = GetParameterToCalculateEllipse(particle,param,i);
307 if (particle == "photon") {
308 if (param.Contains("a")) e = TMath::Min((Double_t)e,70.);
309 else if (param.Contains("b")) e = TMath::Min((Double_t)e,70.);
310 else if (param.Contains("x0")) e = TMath::Max((Double_t)e,1.1);
311 }
e3817e5f 312
88cb7938 313 value = p[0]/TMath::Sqrt(e) + p[1]*e + p[2]*e*e + p[3];
314 return value;
e3817e5f 315}
316
317//_____________________________________________________________________________
fc7e2f43 318Float_t AliPHOSPIDv1::GetParameterPhotonBoundary (Int_t i) const
e3817e5f 319{
320 // Get the parameter "i" to calculate the boundary on the moment M2x
321 // for photons at high p_T
322 Float_t param = 0;
323 if (i>3 || i<0)
324 Error("GetParameterPhotonBoundary","Wrong parameter number: %d\n",i);
325 else
326 param = (*fParameters)(14,i) ;
327 return param;
148b2bba 328}
e3817e5f 329
148b2bba 330//____________________________________________________________________________
fc7e2f43 331Float_t AliPHOSPIDv1::GetParameterPi0Boundary (Int_t i) const
e3817e5f 332{
333 // Get the parameter "i" to calculate the boundary on the moment M2x
334 // for pi0 at high p_T
335 Float_t param = 0;
336 if (i>2 || i<0)
337 Error("GetParameterPi0Boundary","Wrong parameter number: %d\n",i);
338 else
339 param = (*fParameters)(15,i) ;
340 return param;
341}
148b2bba 342
e3817e5f 343//____________________________________________________________________________
fc7e2f43 344Float_t AliPHOSPIDv1::GetParameterTimeGate(Int_t i) const
e3817e5f 345{
88cb7938 346 // Get TimeGate parameter depending on Purity-Efficiency i:
347 // i=0 - Low purity, i=1 - Medium purity, i=2 - High purity
348 Float_t param = 0.;
e3817e5f 349 if(i>2 || i<0)
88cb7938 350 Error("GetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
e3817e5f 351 else
88cb7938 352 param = (*fParameters)(3,i) ;
353 return param;
e3817e5f 354}
355
e3817e5f 356//_____________________________________________________________________________
fc7e2f43 357Float_t AliPHOSPIDv1::GetParameterToCalculateEllipse(TString particle, TString param, Int_t i) const
88cb7938 358{
359 // Get the parameter "i" that is needed to calculate the ellipse
360 // parameter "param" for the particle "particle" ("photon" or "pi0")
361
e3817e5f 362 particle.ToLower();
363 param. ToLower();
88cb7938 364 Int_t offset = -1;
e3817e5f 365 if (particle == "photon") offset=0;
366 else if (particle == "pi0") offset=5;
367 else
88cb7938 368 Error("GetParameterToCalculateEllipse","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
369
370 Int_t p= -1;
371 Float_t par = 0;
e3817e5f 372
373 if (param.Contains("a")) p=4+offset;
374 else if(param.Contains("b")) p=5+offset;
375 else if(param.Contains("c")) p=6+offset;
376 else if(param.Contains("x0"))p=7+offset;
377 else if(param.Contains("y0"))p=8+offset;
12022e83 378
88cb7938 379 if (i>4 || i<0)
380 Error("GetParameterToCalculateEllipse", "No parameter with index", i) ;
381 else if (p==-1)
382 Error("GetParameterToCalculateEllipse", "No parameter with name %s", param.Data() ) ;
12022e83 383 else
88cb7938 384 par = (*fParameters)(p,i) ;
385
386 return par;
12022e83 387}
388
12022e83 389
390//____________________________________________________________________________
fc7e2f43 391Float_t AliPHOSPIDv1::GetDistance(AliPHOSEmcRecPoint * emc,AliPHOSRecPoint * cpv, Option_t * axis)const
69183710 392{
393 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
148b2bba 394
88cb7938 395 const AliPHOSGeometry * geom = AliPHOSGetter::Instance()->PHOSGeometry() ;
69183710 396 TVector3 vecEmc ;
7acf6008 397 TVector3 vecCpv ;
148b2bba 398 if(cpv){
399 emc->GetLocalPosition(vecEmc) ;
400 cpv->GetLocalPosition(vecCpv) ;
401 if(emc->GetPHOSMod() == cpv->GetPHOSMod()){
402 // Correct to difference in CPV and EMC position due to different distance to center.
403 // we assume, that particle moves from center
404 Float_t dCPV = geom->GetIPtoOuterCoverDistance();
405 Float_t dEMC = geom->GetIPtoCrystalSurface() ;
406 dEMC = dEMC / dCPV ;
407 vecCpv = dEMC * vecCpv - vecEmc ;
e3817e5f 408 if (axis == "X") return vecCpv.X();
409 if (axis == "Y") return vecCpv.Y();
410 if (axis == "Z") return vecCpv.Z();
411 if (axis == "R") return vecCpv.Mag();
412 }
148b2bba 413 return 100000000 ;
414 }
7acf6008 415 return 100000000 ;
69183710 416}
bc0c084c 417//____________________________________________________________________________
fc7e2f43 418Int_t AliPHOSPIDv1::GetCPVBit(AliPHOSEmcRecPoint * emc,AliPHOSRecPoint * cpv, Int_t effPur, Float_t e) const
bc0c084c 419{
e3817e5f 420 if(effPur>2 || effPur<0)
421 Error("GetCPVBit","Invalid Efficiency-Purity choice %d",effPur);
bc0c084c 422
e3817e5f 423 Float_t sigX = GetCpv2EmcDistanceCut("X",e);
424 Float_t sigZ = GetCpv2EmcDistanceCut("Z",e);
bc0c084c 425
426 Float_t deltaX = TMath::Abs(GetDistance(emc, cpv, "X"));
427 Float_t deltaZ = TMath::Abs(GetDistance(emc, cpv, "Z"));
428
e3817e5f 429 if((deltaX>sigX*(effPur+1))|(deltaZ>sigZ*(effPur+1)))
bc0c084c 430 return 1;//Neutral
431 else
432 return 0;//Charged
bc0c084c 433}
69183710 434
69183710 435//____________________________________________________________________________
fc7e2f43 436Int_t AliPHOSPIDv1::GetPrincipalBit(TString particle, const Double_t* p, Int_t effPur, Float_t e)const
148b2bba 437{
50739f15 438 //Is the particle inside de PCA ellipse?
581354c5 439
e3817e5f 440 particle.ToLower();
441 Int_t prinbit = 0 ;
442 Float_t a = GetEllipseParameter(particle,"a" , e);
443 Float_t b = GetEllipseParameter(particle,"b" , e);
444 Float_t c = GetEllipseParameter(particle,"c" , e);
445 Float_t x0 = GetEllipseParameter(particle,"x0", e);
446 Float_t y0 = GetEllipseParameter(particle,"y0", e);
447
448 Float_t r = TMath::Power((p[0] - x0)/a,2) +
449 TMath::Power((p[1] - y0)/b,2) +
450 c*(p[0] - x0)*(p[1] - y0)/(a*b) ;
50739f15 451 //3 different ellipses defined
e3817e5f 452 if((effPur==2) && (r<1./2.)) prinbit= 1;
453 if((effPur==1) && (r<2. )) prinbit= 1;
454 if((effPur==0) && (r<9./2.)) prinbit= 1;
50739f15 455
581354c5 456 if(r<0)
e3817e5f 457 Error("GetPrincipalBit", "Negative square?") ;
1f0e7ccd 458
459 return prinbit;
148b2bba 460
148b2bba 461}
1f0e7ccd 462//____________________________________________________________________________
fc7e2f43 463Int_t AliPHOSPIDv1::GetHardPhotonBit(AliPHOSEmcRecPoint * emc) const
1f0e7ccd 464{
e3817e5f 465 // Set bit for identified hard photons (E > 30 GeV)
466 // if the second moment M2x is below the boundary
467
468 Float_t e = emc->GetEnergy();
469 if (e < 30.0) return 0;
470 Float_t m2x = emc->GetM2x();
471 Float_t m2xBoundary = GetParameterPhotonBoundary(0) *
472 TMath::Exp(-TMath::Power(e-GetParameterPhotonBoundary(1),2)/2.0/
473 TMath::Power(GetParameterPhotonBoundary(2),2)) +
474 GetParameterPhotonBoundary(3);
475 Info("GetHardPhotonBit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
476 if (m2x < m2xBoundary)
477 return 1;// A hard photon
478 else
479 return 0;// Not a hard photon
1f0e7ccd 480}
92f521a9 481
e3817e5f 482//____________________________________________________________________________
fc7e2f43 483Int_t AliPHOSPIDv1::GetHardPi0Bit(AliPHOSEmcRecPoint * emc) const
e3817e5f 484{
485 // Set bit for identified hard pi0 (E > 30 GeV)
486 // if the second moment M2x is above the boundary
487
488 Float_t e = emc->GetEnergy();
489 if (e < 30.0) return 0;
490 Float_t m2x = emc->GetM2x();
491 Float_t m2xBoundary = GetParameterPi0Boundary(0) +
492 e * GetParameterPi0Boundary(1);
493 Info("GetHardPi0Bit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
494 if (m2x > m2xBoundary)
495 return 1;// A hard pi0
bc0c084c 496 else
e3817e5f 497 return 0;// Not a hard pi0
f0a4c9e9 498}
e3817e5f 499
500//____________________________________________________________________________
8f2a3661 501TVector3 AliPHOSPIDv1::GetMomentumDirection(AliPHOSEmcRecPoint * emc, AliPHOSRecPoint * )const
88cb7938 502{
503 // Calculates the momentum direction:
504 // 1. if only a EMC RecPoint, direction is given by IP and this RecPoint
505 // 2. if a EMC RecPoint and CPV RecPoint, direction is given by the line through the 2 recpoints
506 // However because of the poor position resolution of PPSD the direction is always taken as if we were
507 // in case 1.
f0a4c9e9 508
88cb7938 509 TVector3 dir(0,0,0) ;
9688c1dd 510
88cb7938 511 TVector3 emcglobalpos ;
512 TMatrix dummy ;
bf8f1fbd 513
88cb7938 514 emc->GetGlobalPosition(emcglobalpos, dummy) ;
bf8f1fbd 515
e3817e5f 516
88cb7938 517 dir = emcglobalpos ;
88cb7938 518 dir.SetMag(1.) ;
e3817e5f 519
88cb7938 520 //account correction to the position of IP
521 Float_t xo,yo,zo ; //Coordinates of the origin
522 gAlice->Generator()->GetOrigin(xo,yo,zo) ;
523 TVector3 origin(xo,yo,zo);
524 dir = dir - origin ;
e3817e5f 525
88cb7938 526 return dir ;
7acf6008 527}
7b7c1533 528
529//____________________________________________________________________________
e3817e5f 530void AliPHOSPIDv1::MakeRecParticles()
531{
b2a60966 532 // Makes a RecParticle out of a TrackSegment
148b2bba 533
88cb7938 534 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
fbf811ec 535 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
536 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
537 TClonesArray * trackSegments = gime->TrackSegments() ;
148b2bba 538 if ( !emcRecPoints || !cpvRecPoints || !trackSegments ) {
f1611b7c 539 Fatal("MakeRecParticles", "RecPoints or TrackSegments not found !") ;
148b2bba 540 }
fbf811ec 541 TClonesArray * recParticles = gime->RecParticles() ;
01a599c9 542 recParticles->Clear();
148b2bba 543
7b7c1533 544 TIter next(trackSegments) ;
7acf6008 545 AliPHOSTrackSegment * ts ;
6ad0bfa0 546 Int_t index = 0 ;
09fc14a0 547 AliPHOSRecParticle * rp ;
7acf6008 548 while ( (ts = (AliPHOSTrackSegment *)next()) ) {
fad3e5b9 549
7b7c1533 550 new( (*recParticles)[index] ) AliPHOSRecParticle() ;
551 rp = (AliPHOSRecParticle *)recParticles->At(index) ;
f0a4c9e9 552 rp->SetTrackSegment(index) ;
9688c1dd 553 rp->SetIndexInList(index) ;
148b2bba 554
7acf6008 555 AliPHOSEmcRecPoint * emc = 0 ;
556 if(ts->GetEmcIndex()>=0)
7b7c1533 557 emc = (AliPHOSEmcRecPoint *) emcRecPoints->At(ts->GetEmcIndex()) ;
fad3e5b9 558
7acf6008 559 AliPHOSRecPoint * cpv = 0 ;
560 if(ts->GetCpvIndex()>=0)
7b7c1533 561 cpv = (AliPHOSRecPoint *) cpvRecPoints->At(ts->GetCpvIndex()) ;
fad3e5b9 562
148b2bba 563 // Now set type (reconstructed) of the particle
564
565 // Choose the cluster energy range
9fa5f1d0 566
fbf811ec 567 if (!emc) {
f1611b7c 568 Fatal("MakeRecParticles", "-> emc(%d) = %d", ts->GetEmcIndex(), emc ) ;
fbf811ec 569 }
50739f15 570
e3817e5f 571 Float_t e = emc->GetEnergy() ;
bc0c084c 572
6f969528 573 Float_t lambda[2] ;
574 emc->GetElipsAxis(lambda) ;
50739f15 575
576 if((lambda[0]>0.01) && (lambda[1]>0.01)){
577 // Looking PCA. Define and calculate the data (X),
bc0c084c 578 // introduce in the function X2P that gives the components (P).
579
e3817e5f 580 Float_t Spher = 0. ;
581 Float_t Emaxdtotal = 0. ;
50739f15 582
bc0c084c 583 if((lambda[0]+lambda[1])!=0)
e3817e5f 584 Spher=fabs(lambda[0]-lambda[1])/(lambda[0]+lambda[1]);
50739f15 585
e3817e5f 586 Emaxdtotal=emc->GetMaximalEnergy()/emc->GetEnergy();
50739f15 587
588 fX[0] = lambda[0] ;
589 fX[1] = lambda[1] ;
590 fX[2] = emc->GetDispersion() ;
e3817e5f 591 fX[3] = Spher ;
50739f15 592 fX[4] = emc->GetMultiplicity() ;
e3817e5f 593 fX[5] = Emaxdtotal ;
50739f15 594 fX[6] = emc->GetCoreEnergy() ;
595
e3817e5f 596 fPrincipalPhoton->X2P(fX,fPPhoton);
597 fPrincipalPi0 ->X2P(fX,fPPi0);
1f0e7ccd 598
50739f15 599 }
600 else{
e3817e5f 601 fPPhoton[0]=-100.0; //We do not accept clusters with
602 fPPhoton[1]=-100.0; //one cell as a photon-like
603 fPPi0[0] =-100.0;
604 fPPi0[1] =-100.0;
50739f15 605 }
606
6f969528 607 Float_t time =emc->GetTime() ;
9fa5f1d0 608
bc0c084c 609 // Loop of Efficiency-Purity (the 3 points of purity or efficiency
610 // are taken into account to set the particle identification)
e3817e5f 611 for(Int_t effPur = 0; effPur < 3 ; effPur++){
50739f15 612
bc0c084c 613 // Looking at the CPV detector. If RCPV greater than CpvEmcDistance,
614 // 1st,2nd or 3rd bit (depending on the efficiency-purity point )
615 // is set to 1
e3817e5f 616 if(GetCPVBit(emc, cpv, effPur,e) == 1 )
617 rp->SetPIDBit(effPur) ;
f0a4c9e9 618
50739f15 619 // Looking the TOF. If TOF smaller than gate, 4th, 5th or 6th
620 // bit (depending on the efficiency-purity point )is set to 1
e3817e5f 621 if(time< (*fParameters)(2,effPur))
622 rp->SetPIDBit(effPur+3) ;
50739f15 623
e3817e5f 624 //Photon PCA
50739f15 625 //If we are inside the ellipse, 7th, 8th or 9th
626 // bit (depending on the efficiency-purity point )is set to 1
e3817e5f 627 if(GetPrincipalBit("photon",fPPhoton,effPur,e) == 1)
628 rp->SetPIDBit(effPur+6) ;
1f0e7ccd 629
e3817e5f 630 //Pi0 PCA
1f0e7ccd 631 //If we are inside the ellipse, 10th, 11th or 12th
632 // bit (depending on the efficiency-purity point )is set to 1
e3817e5f 633 if(GetPrincipalBit("pi0" ,fPPi0 ,effPur,e) == 1)
634 rp->SetPIDBit(effPur+9) ;
f0a4c9e9 635 }
e3817e5f 636 if(GetHardPhotonBit(emc))
637 rp->SetPIDBit(12) ;
638 if(GetHardPi0Bit (emc))
639 rp->SetPIDBit(13) ;
1f0e7ccd 640
9fa5f1d0 641 //Set momentum, energy and other parameters
50739f15 642 Float_t encal = GetCalibratedEnergy(e);
9fa5f1d0 643 TVector3 dir = GetMomentumDirection(emc,cpv) ;
644 dir.SetMag(encal) ;
645 rp->SetMomentum(dir.X(),dir.Y(),dir.Z(),encal) ;
646 rp->SetCalcMass(0);
e0ed2e49 647 rp->Name(); //If photon sets the particle pdg name to gamma
e747b8da 648 rp->SetProductionVertex(0,0,0,0);
649 rp->SetFirstMother(-1);
650 rp->SetLastMother(-1);
651 rp->SetFirstDaughter(-1);
652 rp->SetLastDaughter(-1);
653 rp->SetPolarisation(0,0,0);
d956e9b7 654 //Set the position in global coordinate system from the RecPoint
655 AliPHOSGeometry * geom = gime->PHOSGeometry() ;
656 AliPHOSTrackSegment * ts = gime->TrackSegment(rp->GetPHOSTSIndex()) ;
657 AliPHOSEmcRecPoint * erp = gime->EmcRecPoint(ts->GetEmcIndex()) ;
658 TVector3 pos ;
659 geom->GetGlobal(erp, pos) ;
660 rp->SetPos(pos);
661
6ad0bfa0 662 index++ ;
663 }
6ad0bfa0 664}
e3817e5f 665
09fc14a0 666//____________________________________________________________________________
88cb7938 667void AliPHOSPIDv1::Print() const
09fc14a0 668{
b2a60966 669 // Print the parameters used for the particle type identification
bc0c084c 670
88cb7938 671 Info("Print", "=============== AliPHOSPIDv1 ================") ;
672 printf("Making PID\n") ;
673 printf(" Pricipal analysis file from 0.5 to 100 %s\n", fFileNamePrincipalPhoton.Data() ) ;
674 printf(" Name of parameters file %s\n", fFileNameParameters.Data() ) ;
675 printf(" Matrix of Parameters: 14x4\n") ;
676 printf(" Energy Calibration 1x3 [3 parametres to calibrate energy: A + B* E + C * E^2]\n") ;
677 printf(" RCPV 2x3 rows x and z, columns function cut parameters\n") ;
678 printf(" TOF 1x3 [High Eff-Low Pur,Medium Eff-Pur, Low Eff-High Pur]\n") ;
679 printf(" PCA 5x4 [5 ellipse parametres and 4 parametres to calculate them: A/Sqrt(E) + B* E + C * E^2 + D]\n") ;
680 Printf(" Pi0 PCA 5x3 [5 ellipse parametres and 3 parametres to calculate them: A + B* E + C * E^2]\n") ;
50739f15 681 fParameters->Print() ;
09fc14a0 682}
683
8d0f3f77 684
69183710 685
7acf6008 686//____________________________________________________________________________
a4e98857 687void AliPHOSPIDv1::PrintRecParticles(Option_t * option)
688{
dd5c4038 689 // Print table of reconstructed particles
690
88cb7938 691 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
bf8f1fbd 692
88cb7938 693 TClonesArray * recParticles = gime->RecParticles() ;
21cd0c07 694
695 TString message ;
3bf72d32 696 message = "\nevent " ;
697 message += gAlice->GetEvNumber() ;
698 message += " found " ;
699 message += recParticles->GetEntriesFast();
700 message += " RecParticles\n" ;
701
7acf6008 702 if(strstr(option,"all")) { // printing found TS
3bf72d32 703 message += "\n PARTICLE Index \n" ;
7acf6008 704
705 Int_t index ;
7b7c1533 706 for (index = 0 ; index < recParticles->GetEntries() ; index++) {
21cd0c07 707 AliPHOSRecParticle * rp = (AliPHOSRecParticle * ) recParticles->At(index) ;
3bf72d32 708 message += "\n" ;
709 message += rp->Name().Data() ;
710 message += " " ;
711 message += rp->GetIndexInList() ;
712 message += " " ;
713 message += rp->GetType() ;
7acf6008 714 }
3bf72d32 715 }
716 Info("Print", message.Data() ) ;
69183710 717}
88cb7938 718
719//____________________________________________________________________________
720void AliPHOSPIDv1::SetParameters()
721{
722 // PCA : To do the Principal Components Analysis it is necessary
723 // the Principal file, which is opened here
724 fX = new double[7]; // Data for the PCA
725 fPPhoton = new double[7]; // Eigenvalues of the PCA
726 fPPi0 = new double[7]; // Eigenvalues of the Pi0 PCA
727
728 // Read photon principals from the photon file
729
730 fFileNamePrincipalPhoton = "$ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root" ;
731 TFile f( fFileNamePrincipalPhoton.Data(), "read" ) ;
732 fPrincipalPhoton = dynamic_cast<TPrincipal*> (f.Get("principal")) ;
733 f.Close() ;
734
735 // Read pi0 principals from the pi0 file
736
737 fFileNamePrincipalPi0 = "$ALICE_ROOT/PHOS/PCA_pi0_40-120.root" ;
738 TFile fPi0( fFileNamePrincipalPi0.Data(), "read" ) ;
739 fPrincipalPi0 = dynamic_cast<TPrincipal*> (fPi0.Get("principal")) ;
740 fPi0.Close() ;
741
742 // Open parameters file and initialization of the Parameters matrix.
743 // In the File Parameters.dat are all the parameters. These are introduced
744 // in a matrix of 16x4
745 //
746 // All the parameters defined in this file are, in order of row:
747 // line 0 : calibration
748 // lines 1,2 : CPV rectangular cat for X and Z
749 // line 3 : TOF cut
750 // lines 4-8 : parameters to calculate photon PCA ellipse
751 // lines 9-13: parameters to calculate pi0 PCA ellipse
752 // lines 14-15: parameters to calculate border for high-pt photons and pi0
753
754 fFileNameParameters = gSystem->ExpandPathName("$ALICE_ROOT/PHOS/Parameters.dat");
755 fParameters = new TMatrix(16,4) ;
756 const Int_t maxLeng=255;
757 char string[maxLeng];
758
759 // Open a text file with PID parameters
760 FILE *fd = fopen(fFileNameParameters.Data(),"r");
761 if (!fd)
762 Fatal("SetParameter","File %s with a PID parameters cannot be opened\n",
763 fFileNameParameters.Data());
764
765 Int_t i=0;
766 // Read parameter file line-by-line and skip empty line and comments
767 while (fgets(string,maxLeng,fd) != NULL) {
768 if (string[0] == '\n' ) continue;
769 if (string[0] == '!' ) continue;
770 sscanf(string, "%f %f %f %f",
771 &(*fParameters)(i,0), &(*fParameters)(i,1),
772 &(*fParameters)(i,2), &(*fParameters)(i,3));
773 i++;
774 //printf("line %d: %s",i,string);
775 }
776 fclose(fd);
777}
778
779//____________________________________________________________________________
780void AliPHOSPIDv1::SetParameterCalibration(Int_t i,Float_t param)
781{
782 // Set parameter "Calibration" i to a value param
783 if(i>2 || i<0)
784 Error("SetParameterCalibration","Invalid parameter number: %d",i);
785 else
786 (*fParameters)(0,i) = param ;
787}
788
789//____________________________________________________________________________
790void AliPHOSPIDv1::SetParameterCpv2Emc(Int_t i, TString axis, Float_t cut)
791{
792 // Set the parameters to calculate Cpv-to-Emc Distance Cut depending on
793 // Purity-Efficiency point i
794
795 if(i>2 || i<0)
796 Error("SetParameterCpv2Emc","Invalid parameter number: %d",i);
797 else {
798 axis.ToLower();
799 if (axis == "x") (*fParameters)(1,i) = cut;
800 else if (axis == "z") (*fParameters)(2,i) = cut;
801 else Error("SetParameterCpv2Emc","Invalid axis name: %s",axis.Data());
802 }
803}
804
805//____________________________________________________________________________
806void AliPHOSPIDv1::SetParameterPhotonBoundary(Int_t i,Float_t param)
807{
808 // Set parameter "Hard photon boundary" i to a value param
809 if(i>4 || i<0)
810 Error("SetParameterPhotonBoundary","Invalid parameter number: %d",i);
811 else
812 (*fParameters)(14,i) = param ;
813}
814
815//____________________________________________________________________________
816void AliPHOSPIDv1::SetParameterPi0Boundary(Int_t i,Float_t param)
817{
818 // Set parameter "Hard pi0 boundary" i to a value param
819 if(i>1 || i<0)
820 Error("SetParameterPi0Boundary","Invalid parameter number: %d",i);
821 else
822 (*fParameters)(15,i) = param ;
823}
824
825//_____________________________________________________________________________
826void AliPHOSPIDv1::SetParameterTimeGate(Int_t i, Float_t gate)
827{
828 // Set the parameter TimeGate depending on Purity-Efficiency point i
829 if (i>2 || i<0)
830 Error("SetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
831 else
832 (*fParameters)(3,i)= gate ;
833}
834
835//_____________________________________________________________________________
836void AliPHOSPIDv1::SetParameterToCalculateEllipse(TString particle, TString param, Int_t i, Float_t par)
837{
838 // Set the parameter "i" that is needed to calculate the ellipse
839 // parameter "param" for a particle "particle"
840
841 particle.ToLower();
842 param. ToLower();
843 Int_t p= -1;
844 Int_t offset=0;
845
846 if (particle == "photon") offset=0;
847 else if (particle == "pi0") offset=5;
848 else
849 Error("SetParameterToCalculateEllipse","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
850
851 if (param.Contains("a")) p=4+offset;
852 else if(param.Contains("b")) p=5+offset;
853 else if(param.Contains("c")) p=6+offset;
854 else if(param.Contains("x0"))p=7+offset;
855 else if(param.Contains("y0"))p=8+offset;
856 if((i>4)||(i<0))
857 Error("SetEllipseParameter", "No parameter with index %d", i) ;
858 else if(p==-1)
859 Error("SetEllipseParameter", "No parameter with name %s", param.Data() ) ;
860 else
861 (*fParameters)(p,i) = par ;
862}
863
864//____________________________________________________________________________
865void AliPHOSPIDv1::Unload()
866{
867 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
868 gime->PhosLoader()->UnloadRecPoints() ;
869 gime->PhosLoader()->UnloadTracks() ;
870 gime->PhosLoader()->UnloadRecParticles() ;
871}
872
873//____________________________________________________________________________
90cceaf6 874void AliPHOSPIDv1::WriteRecParticles()
88cb7938 875{
876
877 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
878
879 TClonesArray * recParticles = gime->RecParticles() ;
880 recParticles->Expand(recParticles->GetEntriesFast() ) ;
881 TTree * treeP = gime->TreeP();
882
883 //First rp
884 Int_t bufferSize = 32000 ;
885 TBranch * rpBranch = treeP->Branch("PHOSRP",&recParticles,bufferSize);
886 rpBranch->SetTitle(BranchName());
887
888 rpBranch->Fill() ;
889
890 gime->WriteRecParticles("OVERWRITE");
891 gime->WritePID("OVERWRITE");
892}
893