1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 #include "AliMuonTrackCuts.h"
21 #include "TObjArray.h"
22 #include "TObjString.h"
24 #include "TParameter.h"
29 #include "AliVParticle.h"
30 #include "AliESDMuonTrack.h"
31 #include "AliAODTrack.h"
34 ClassImp(AliMuonTrackCuts) // Class implementation in ROOT context
38 //________________________________________________________________________
39 AliMuonTrackCuts::AliMuonTrackCuts() :
43 fUseCustomParam(kFALSE),
44 fParameters(TArrayD(kNParameters))
50 //________________________________________________________________________
51 AliMuonTrackCuts::AliMuonTrackCuts(const char* name, const char* title, Bool_t isESD ) :
52 AliAnalysisCuts(name, title),
55 fUseCustomParam(kFALSE),
56 fParameters(TArrayD(kNParameters))
60 SetDefaultFilterMask();
64 //________________________________________________________________________
65 AliMuonTrackCuts::AliMuonTrackCuts(const AliMuonTrackCuts& obj) :
69 fUseCustomParam(obj.fUseCustomParam),
70 fParameters(obj.fParameters)
76 //________________________________________________________________________
77 AliMuonTrackCuts::~AliMuonTrackCuts()
82 //________________________________________________________________________
83 Bool_t AliMuonTrackCuts::RunMatchesRange( Int_t runNumber, const Char_t* objName )
85 /// Check if the object contains the run
86 TString sname(objName);
87 TObjArray* array = sname.Tokenize("_");
89 Int_t runRange[2] = { -1, -1 };
90 if ( array->GetEntries() >= 3 ) {
91 for ( Int_t irun=0; irun<2; ++irun ) {
92 TString currRun = array->At(irun+1)->GetName();
93 if ( currRun.IsDigit() ) runRange[irun] = currRun.Atoi();
97 return ( runNumber >= runRange[0] && runNumber <= runRange[1]);
100 //________________________________________________________________________
101 void AliMuonTrackCuts::SetUseCustomParam( Bool_t useCustomParam, Int_t runNumber )
103 /// Flag to select custom parameters
104 /// It first searches the default parameters in OADB
105 /// then disables the access to the OADB
106 /// and allows to manually modify parameters
108 if ( ! fUseCustomParam && useCustomParam ) SetRun(runNumber);
109 fUseCustomParam = useCustomParam;
112 //________________________________________________________________________
113 Bool_t AliMuonTrackCuts::SetRun( Int_t runNumber )
115 /// Get parameters from OADB for runNumber
117 if ( fUseCustomParam ) return kFALSE;
118 return StreamParameters(runNumber, -1);
122 //________________________________________________________________________
123 Bool_t AliMuonTrackCuts::StreamParameters( Int_t runNumber, Int_t runMax )
125 if ( runMax > 0 ) { // Stream to OADB
126 if ( ! fUseCustomParam ) {
127 AliError("Users are not allowed to update OADB. Use SetUseCustomParam() instead");
132 TString filename = "$ALICE_ROOT/OADB/PWG3/MuonTrackCuts.root";
133 if ( fIsMC ) filename.ReplaceAll(".root", "_MC.root");
135 TString parNames[kNParameters];
136 parNames[kMeanDcaX] = "MeanDcaX";
137 parNames[kMeanDcaY] = "MeanDcaY";
138 parNames[kMeanDcaZ] = "MeanDcaZ";
139 parNames[kMeanPCorr23] = "MeanPCorr23";
140 parNames[kMeanPCorr310] = "MeanPCorr310";
141 parNames[kSigmaPdca23] = "SigmaPdca23";
142 parNames[kSigmaPdca310] = "SigmaPdca310";
143 parNames[kNSigmaPdcaCut] = "NSigmaPdcaCut";
144 parNames[kChi2NormCut] = "Chi2NormCut";
145 parNames[kRelPResolution] = "RelPResolution";
147 TObjArray* paramList = 0x0;
149 if ( runMax < 0 ) { // Get from OADB
150 TFile* file = TFile::Open(filename.Data(), "READ");
152 AliError(Form("OADB file %s not found!", filename.Data()));
156 TList* listOfKeys = file->GetListOfKeys();
157 TIter next(listOfKeys);
159 Bool_t foundMatch = kFALSE;
160 TObject* defaultObj = 0x0;
161 while ( ( key = next() ) ) {
162 TString objName = key->GetName();
164 if ( RunMatchesRange(runNumber, objName.Data()) ) {
165 paramList = static_cast<TObjArray*>(file->Get(key->GetName()));
169 if ( objName.Contains("DEFAULT") ) defaultObj = file->Get(key->GetName());
172 if ( ! foundMatch ) {
173 AliWarning("Run number not found in OADB: using default");
174 if ( defaultObj ) paramList = static_cast<TObjArray*>(defaultObj);
177 AliError("Default parameters not found in OADB!");
182 AliInfo(Form("Required run %i. Param. set: %s", runNumber, paramList->GetName()));
184 for ( Int_t ipar=0; ipar<kNParameters; ++ipar ) {
185 TParameter<Double_t>* param = static_cast<TParameter<Double_t>*>(paramList->FindObject(parNames[ipar].Data()));
187 AliWarning(Form("Parameter %s not set", parNames[ipar].Data()));
190 fParameters[ipar] = param->GetVal();
197 paramList = new TObjArray(kNParameters);
198 paramList->SetOwner();
200 for ( Int_t ipar=0; ipar<kNParameters; ++ipar ) {
201 TParameter<Double_t>* param= new TParameter<Double_t>(parNames[ipar].Data(), fParameters[ipar]);
202 paramList->AddAt(param, ipar);
205 TString paramListName = "MuonCuts_";
206 paramListName += ( runNumber < 0 ) ? "Default" : Form("%i_%i",runNumber, runMax);
207 AliInfo(Form("Adding %s to file %s", paramListName.Data(), filename.Data()));
208 paramList->SetName(paramListName.Data());
209 TFile* file = TFile::Open(filename.Data(), "UPDATE");
210 paramList->Write(paramListName.Data(), TObject::kSingleKey);
217 //________________________________________________________________________
218 Bool_t AliMuonTrackCuts::SetParameter(Int_t iparam, Float_t value)
221 if ( fUseCustomParam ) {
222 fParameters.SetAt(value, iparam);
226 AliWarning("Parameters automatically taken from OADB. If you want to use with custom parameters, use SetUseCustomParam()");
231 //________________________________________________________________________
232 Bool_t AliMuonTrackCuts::IsSelected( TObject* obj )
234 /// Track is selected
235 UInt_t filterMask = GetFilterMask();
236 UInt_t selectionMask = GetSelectionMask(obj);
238 return ( ( selectionMask & filterMask ) == filterMask );
242 //________________________________________________________________________
243 UInt_t AliMuonTrackCuts::GetSelectionMask( const TObject* obj )
245 /// Get selection mask
247 const AliVParticle* track = static_cast<const AliVParticle*> ( obj );
249 UInt_t selectionMask = 0;
251 Bool_t isMuon = ( fIsESD ) ? ((AliESDMuonTrack*)track)->ContainTrackerData() : ((AliAODTrack*)track)->IsMuonTrack();
253 if ( ! isMuon ) return selectionMask;
255 Double_t eta = track->Eta();
256 if ( eta > -4. && eta < -2.5 ) selectionMask |= kMuEta;
258 Double_t rAbsEnd = ( fIsESD ) ? ((AliESDMuonTrack*)track)->GetRAtAbsorberEnd() : ((AliAODTrack*)track)->GetRAtAbsorberEnd();
259 Double_t thetaAbsEndDeg = TMath::ATan( rAbsEnd / 505. ) * TMath::RadToDeg();
261 if ( thetaAbsEndDeg > 2. && thetaAbsEndDeg < 10. ) selectionMask |= kMuThetaAbs;
263 Int_t matchTrig = ( fIsESD ) ? ((AliESDMuonTrack*)track)->GetMatchTrigger() : ((AliAODTrack*)track)->GetMatchTrigger();
264 if ( matchTrig >= 1 ) selectionMask |= kMuMatchApt;
265 if ( matchTrig >= 2 ) selectionMask |= kMuMatchLpt;
266 if ( matchTrig >= 3 ) selectionMask |= kMuMatchHpt;
268 Double_t chi2norm = ( fIsESD ) ? ((AliESDMuonTrack*)track)->GetNormalizedChi2() : ((AliAODTrack*)track)->Chi2perNDF();
269 if ( chi2norm < GetChi2NormCut() ) selectionMask |= kMuTrackChiSquare;
271 TVector3 dcaAtVz = GetCorrectedDCA(track);
272 Double_t pTotMean = GetAverageMomentum(track);
274 Double_t pDca = pTotMean * dcaAtVz.Mag();
276 Double_t pTot = track->P();
278 // Momentum resolution only
279 // The cut depends on the momentum resolution. In particular:
280 // Sigma_pDCA = Sqrt( Sigma_pDCA_measured^2 + Sigma_p/p * pDCA)
281 // The relative momentum distribution Sigma_p/p is estimated from the track Delta_p,
282 // and from the error on sagitta Delta_s:
283 // Delta_p/p = p*Delta_s/(1+p*Delta_s)
284 // A cut at N sigmas requres a cut in N Delta_s, so
285 // Sigma_p/p(N) = p*N*Delta_s/(1+p*N*Delta_s)
286 //Double_t pResolutionEffect = pDca * pTot * GetRelPResolution() / ( 1. + GetNSigmaPdca() * GetRelPResolution()*pTot );
288 //Double_t pResolutionEffect = 0.4 * pTot; // Values used in 2010 data
289 //Double_t pResolutionEffect = 0.32 * pTot; // Values in 2011
290 //Double_t sigmaPdca = GetSigmaPdca(rAbsEnd);
291 //Double_t sigmaPdcaWithRes = TMath::Sqrt( sigmaPdca*sigmaPdca + pResolutionEffect*pResolutionEffect );
293 // Momentum resolution and slope resolution
294 // Due to the momentum resolution, the measured momentum is biased
295 // Since we want to keep as much signal as possible, we want to avoid
296 // that a measured pxDCA is rejected since the momentum is overestimated
297 // p_true = p_meas - Delta_p
298 // p_true = p_meas - N*Delta_s*p_meas / (1+n*Delta_s*p_meas)
300 // p_true x DCA < N * Sigma_pDCA_meas =>
301 // p_meas x DCA < N * Sigma_pDCA_meas / ( 1 - N*Delta_s*p_meas / (1+n*Delta_s*p_meas))
302 // Finally the cut value has to be summed in quadrature with the error on DCA,
303 // which is given by the slope resolution
304 // p_meas x DCA < N * Sqrt( ( Sigma_pDCA_meas / ( 1 - N*Delta_s*p_meas / (1+n*Delta_s*p_meas)) )^2 + (distance * sigma_slope * p_meas )^2)
305 Double_t nrp = GetNSigmaPdca() * GetRelPResolution() * pTot;
306 Double_t pResolutionEffect = GetSigmaPdca(rAbsEnd) / ( 1. - nrp / ( 1. + nrp ) );
307 Double_t slopeResolutionEffect = 535. * GetSlopeResolution() * pTot;
309 Double_t sigmaPdcaWithRes = TMath::Sqrt( pResolutionEffect*pResolutionEffect + slopeResolutionEffect*slopeResolutionEffect );
311 if ( pDca < GetNSigmaPdca() * sigmaPdcaWithRes ) selectionMask |= kMuPdca;
313 return selectionMask;
317 //________________________________________________________________________
318 Bool_t AliMuonTrackCuts::IsSelected( TList* /* list */)
321 AliError("Function not implemented: Use IsSelected(TObject*)");
326 //________________________________________________________________________
327 Int_t AliMuonTrackCuts::GetThetaAbsBin ( Double_t rAtAbsEnd ) const
329 /// Get theta abs bin
330 Double_t thetaAbsEndDeg = TMath::ATan( rAtAbsEnd / 505. ) * TMath::RadToDeg();
331 Int_t thetaAbsBin = ( thetaAbsEndDeg < 3. ) ? kThetaAbs23 : kThetaAbs310;
336 //________________________________________________________________________
337 TVector3 AliMuonTrackCuts::GetCorrectedDCA ( const AliVParticle* track ) const
339 /// Get corrected DCA
343 vtxPos[0] = ((AliESDMuonTrack*)track)->GetNonBendingCoor();
344 vtxPos[1] = ((AliESDMuonTrack*)track)->GetBendingCoor();
345 vtxPos[2] = ((AliESDMuonTrack*)track)->GetZ();
347 else ((AliAODTrack*)track)->GetXYZ(vtxPos);
349 TVector3 vertex(vtxPos);
351 TVector3 dcaTrack(0.,0., vtxPos[2]);
352 dcaTrack.SetX( ( fIsESD ) ? ((AliESDMuonTrack*)track)->GetNonBendingCoorAtDCA() : ((AliAODTrack*)track)->XAtDCA() );
353 dcaTrack.SetY( ( fIsESD ) ? ((AliESDMuonTrack*)track)->GetBendingCoorAtDCA() : ((AliAODTrack*)track)->YAtDCA() );
355 TVector3 dcaAtVz = dcaTrack - vertex - GetMeanDCA();
360 //________________________________________________________________________
361 Double_t AliMuonTrackCuts::GetAverageMomentum ( const AliVParticle* track ) const
363 /// Get average momentum before and after the absorber
365 Double_t pTotMean = 0.;
367 Double_t pTot = track->P();
368 //if ( fIsESD ) pTotMean = 0.5 * ( pTot + ((AliESDMuonTrack*)track)->PUncorrected() );
369 if ( fIsESD ) pTotMean = ((AliESDMuonTrack*)track)->PUncorrected(); // Increased stability if using uncorrected value
371 pTotMean = pTot - GetMeanPCorr(((AliAODTrack*)track)->GetRAtAbsorberEnd());
378 //________________________________________________________________________
379 void AliMuonTrackCuts::SetMeanDCA ( Double_t xAtDca, Double_t yAtDca, Double_t zAtDca )
381 /// Set mean DCA from track
382 SetParameter(kMeanDcaX, xAtDca);
383 SetParameter(kMeanDcaY, yAtDca);
384 SetParameter(kMeanDcaZ, zAtDca);
387 //________________________________________________________________________
388 TVector3 AliMuonTrackCuts::GetMeanDCA () const
390 /// Get mean DCA from track
391 return TVector3(fParameters[kMeanDcaX], fParameters[kMeanDcaY], fParameters[kMeanDcaZ]);
394 //________________________________________________________________________
395 void AliMuonTrackCuts::SetMeanPCorr ( Double_t pCorrThetaAbs23, Double_t pCorrThetaAbs310 )
397 /// Set mean p correction
398 SetParameter(kMeanPCorr23, pCorrThetaAbs23);
399 SetParameter(kMeanPCorr310, pCorrThetaAbs310);
402 //________________________________________________________________________
403 Double_t AliMuonTrackCuts::GetMeanPCorr ( Double_t rAtAbsEnd ) const
405 /// Get mean p correction
406 return fParameters[kMeanPCorr23+GetThetaAbsBin(rAtAbsEnd)];
409 //________________________________________________________________________
410 void AliMuonTrackCuts::SetSigmaPdca ( Double_t sigmaThetaAbs23, Double_t sigmaThetaAbs310 )
413 SetParameter(kSigmaPdca23, sigmaThetaAbs23);
414 SetParameter(kSigmaPdca310, sigmaThetaAbs310);
417 //________________________________________________________________________
418 Double_t AliMuonTrackCuts::GetSigmaPdca ( Double_t rAtAbsEnd ) const
421 return fParameters[kSigmaPdca23+GetThetaAbsBin(rAtAbsEnd)];
424 //________________________________________________________________________
425 void AliMuonTrackCuts::SetNSigmaPdca ( Double_t nSigmas )
427 /// Set N sigma pdca cut
428 SetParameter(kNSigmaPdcaCut, nSigmas);
431 //________________________________________________________________________
432 Double_t AliMuonTrackCuts::GetNSigmaPdca () const
434 /// Get N sigma pdca cut
435 return fParameters[kNSigmaPdcaCut];
438 //________________________________________________________________________
439 void AliMuonTrackCuts::SetChi2NormCut ( Double_t chi2normCut )
441 /// Set cut on normalized chi2 of tracks
442 SetParameter(kChi2NormCut,chi2normCut);
445 //________________________________________________________________________
446 Double_t AliMuonTrackCuts::GetChi2NormCut () const
448 /// Get cut on normalized chi2 of tracks
449 return fParameters[kChi2NormCut];
452 //________________________________________________________________________
453 void AliMuonTrackCuts::SetRelPResolution ( Double_t relPResolution )
455 /// Set relative momentum resolution
456 SetParameter(kRelPResolution,relPResolution);
459 //________________________________________________________________________
460 Double_t AliMuonTrackCuts::GetRelPResolution () const
462 /// Get relative momentum resolution
463 return fParameters[kRelPResolution];
467 //________________________________________________________________________
468 void AliMuonTrackCuts::SetSlopeResolution ( Double_t slopeResolution )
470 /// Set slope resolution
471 SetParameter(kSlopeResolution,slopeResolution);
474 //________________________________________________________________________
475 Double_t AliMuonTrackCuts::GetSlopeResolution () const
477 /// Get slope resolution
478 return fParameters[kSlopeResolution];
481 //________________________________________________________________________
482 void AliMuonTrackCuts::SetDefaultFilterMask ()
484 /// Standard cuts for single muon
485 SetFilterMask ( kMuEta | kMuThetaAbs | kMuPdca | kMuMatchApt );
488 //________________________________________________________________________
489 void AliMuonTrackCuts::Print(Option_t* option) const
494 TString sopt(option);
496 if ( sopt.IsNull() || sopt.Contains("*") || sopt.Contains("all") ) sopt = "mask param";
497 UInt_t filterMask = GetFilterMask();
498 if ( sopt.Contains("mask") ) {
499 printf(" *** Muon track filter mask: *** \n");
500 printf(" 0x%x\n", filterMask);
501 if ( filterMask & kMuEta ) printf(" -4 < eta < -2.5\n");
502 if ( filterMask & kMuThetaAbs ) printf(" 2 < theta_abs < 10 deg\n");
503 if ( filterMask & kMuPdca ) printf(" pxDCA cut\n");
504 if ( filterMask & kMuMatchApt ) printf(" match Apt\n");
505 if ( filterMask & kMuMatchLpt ) printf(" match Lpt\n");
506 if ( filterMask & kMuMatchHpt ) printf(" match Hpt\n");
507 if ( filterMask & kMuTrackChiSquare ) printf(" Chi2 cut on track\n");
508 printf(" ******************** \n");
510 if ( sopt.Contains("param") ) {
511 printf(" *** Muon track parameter summary: ***\n");
512 printf(" Mean vertex DCA: (%g, %g, %g)\n", fParameters[kMeanDcaX], fParameters[kMeanDcaY], fParameters[kMeanDcaZ]);
513 printf(" Mean p correction (GeV/c): theta2-3 = %g theta3-10 = %g\n", fParameters[kMeanPCorr23], fParameters[kMeanPCorr310]);
514 printf(" Sigma p x DCA (cm x GeV/c): theta2-3 = %g theta3-10 = %g\n", fParameters[kSigmaPdca23], fParameters[kSigmaPdca310]);
515 printf(" Cut p x DCA in units of sigma: %g\n", fParameters[kNSigmaPdcaCut]);
516 printf(" Cut on track chi2/NDF: %g\n", fParameters[kChi2NormCut]);
517 printf(" Momentum resolution: %g\n", fParameters[kRelPResolution]);
518 printf(" Slope resolution: %g\n", fParameters[kSlopeResolution]);
519 printf(" ********************************\n");