MUON/AliMUONTrackHitPattern.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  13  * provided "as is" without express or implied warranty.                  *
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  15
  16 /* $Id$ */
  17
  18
  19 //-----------------------------------------------------------------------------
  20 /// \class AliMUONTrackHitPattern
  21 ///
  22 /// This class propagates tracks to trigger chambers
  23 /// searching for matching trigger tracks and fired strips.
  24 ///
  25 /// To each track, a hit pattern for trigger chambers is set.
  26 ///
  27 /// The main method is:
  28 /// * ExecuteValidation
  29 ///
  30 ///  \author Diego Stocco
  31 //-----------------------------------------------------------------------------
  32
  33
  34 #include "AliMUONTrackHitPattern.h"
  35
  36 #include "AliMUONConstants.h"
  37 #include "AliMUONVDigit.h"
  38 #include "AliMUONVDigitStore.h"
  39 #include "AliMUONGeometryTransformer.h"
  40 #include "AliMUONLocalTrigger.h"
  41 #include "AliMUONLocalTriggerBoard.h"
  42 #include "AliMUONRecoParam.h"
  43 #include "AliMUONTrack.h"
  44 #include "AliMUONTrackExtrap.h"
  45 #include "AliMUONTrackParam.h"
  46 #include "AliMUONVTrackStore.h"
  47 #include "AliMUONVTriggerStore.h"
  48 #include "AliMpPad.h"
  49 #include "AliMpSegmentation.h"
  50 #include "AliMpVSegmentation.h"
  51 #include "AliMpDEManager.h"
  52 #include "AliMUONReconstructor.h"
  53 #include "AliMUONTriggerTrack.h"
  54 #include "AliMUONVTriggerTrackStore.h"
  55
  56 #include "AliMpConstants.h"
  57
  58 #include "AliLog.h"
  59 #include "AliTracker.h"
  60 #include "AliESDMuonTrack.h"
  61
  62 #include <Riostream.h>
  63 #include <TArrayS.h>
  64 #include <TClonesArray.h>
  65 #include <TMath.h>
  66 #include <TMatrixD.h>
  67 #include <TROOT.h>
  68 #include <TDirectory.h>
  69 #include <TFile.h>
  70 #include <TSystem.h>
  71 #include <TVector2.h>
  72
  73 #include <cassert>
  74
  75 /// \cond CLASSIMP
  76 ClassImp(AliMUONTrackHitPattern) // Class implementation in ROOT context
  77 /// \endcond
  78
  79
  80 //______________________________________________________________________________
  81 AliMUONTrackHitPattern::AliMUONTrackHitPattern(const AliMUONRecoParam* recoParam,
  82                                                const AliMUONGeometryTransformer& transformer,
  83                                                const AliMUONVDigitStore& digitStore)
  84 : TObject(),
  85 fkRecoParam(recoParam),
  86 fkTransformer(transformer),
  87 fkDigitStore(digitStore),
  88 fkMaxDistance(99999.)
  89 {
  90     /// Default constructor
  91     AliMUONTrackExtrap::SetField();
  92 }
  93
  94
  95 //______________________________________________________________________________
  96 AliMUONTrackHitPattern::~AliMUONTrackHitPattern(void)
  97 {
  98   /// Destructor
  99 }
 100
 101 //_____________________________________________________________________________
 102 void AliMUONTrackHitPattern::CheckConstants() const
 103 {
 104 /// Check consistence of redefined constants
 105
 106   assert(fgkNcathodes == AliMpConstants::NofCathodes());
 107   assert(fgkNchambers == AliMpConstants::NofTriggerChambers());
 108   assert(fgkNplanes == AliMpConstants::NofTriggerChambers() * fgkNcathodes);
 109 }
 110
 111
 112 //______________________________________________________________________________
 113 void AliMUONTrackHitPattern::ExecuteValidation(const AliMUONVTrackStore& trackStore,
 114                                                const AliMUONVTriggerTrackStore& triggerTrackStore,
 115                                                const AliMUONVTriggerStore& triggerStore) const
 116 {
 117   //
 118   /// Main method:
 119   /// Loops on reco tracks, extrapolates them to trigger chambers
 120   /// and searches for matching trigger tracks and digits
 121   //
 122
 123   // Get the hit pattern for all trigger tracks
 124   AliMUONTriggerTrack* triggerTrack;
 125   TIter itTriggerTrack(triggerTrackStore.CreateIterator());
 126   while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) ){
 127     UShort_t pattern = GetHitPattern(triggerTrack);
 128     triggerTrack->SetHitsPatternInTrigCh(pattern);
 129     AliDebug(1, Form("Hit pattern: hits 0x%x  slat %2i  board %3i  effFlag %i",
 130                      pattern & 0xFF, AliESDMuonTrack::GetSlatOrInfo(pattern),
 131                      triggerTrack->GetLoTrgNum(), AliESDMuonTrack::GetEffFlag(pattern)));
 132   }
 133
 134   // Match tracker tracks with trigger tracks.
 135   TIter itTrack(trackStore.CreateIterator());
 136   AliMUONTrack* track;
 137
 138   const Int_t kFirstTrigCh = AliMUONConstants::NTrackingCh();
 139
 140   while ( ( track = static_cast<AliMUONTrack*>(itTrack()) ) )
 141   {
 142     AliMUONTrackParam trackParam(*((AliMUONTrackParam*) (track->GetTrackParamAtCluster()->Last())));
 143
 144     ApplyMCSCorrections(trackParam);
 145     AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(kFirstTrigCh)); // extrap to 1st trigger chamber
 146
 147     AliMUONTriggerTrack *matchedTriggerTrack = MatchTriggerTrack(track, trackParam, triggerTrackStore, triggerStore);
 148
 149     // Copy trigger tracks hit pattern if there is matching,
 150     // otherwise calculate the hit pattern directly from tracker track:
 151     // the obtained pattern is good for check, but not good for efficiency determination.
 152     UShort_t pattern = matchedTriggerTrack ?
 153       matchedTriggerTrack->GetHitsPatternInTrigCh() :
 154       GetHitPattern(&trackParam);
 155
 156     track->SetHitsPatternInTrigCh(pattern);
 157   }
 158 }
 159
 160
 161 //______________________________________________________________________________
 162 AliMUONTriggerTrack *
 163 AliMUONTrackHitPattern::MatchTriggerTrack(AliMUONTrack* track,
 164                                           AliMUONTrackParam& trackParam,
 165                                           const AliMUONVTriggerTrackStore& triggerTrackStore,
 166                                           const AliMUONVTriggerStore& triggerStore) const
 167 {
 168   //
 169   /// Match track with trigger track
 170   //
 171
 172   Int_t matchTrigger = 0;
 173   Int_t loTrgNum(-1);
 174   TMatrixD paramDiff(3,1);
 175   Double_t chi2;
 176   Double_t chi2MatchTrigger = 0., minChi2MatchTrigger = 999.;
 177   Int_t doubleMatch = -1; // Check if track matches 2 trigger tracks
 178   Double_t doubleChi2 = -1.;
 179   AliMUONTriggerTrack* doubleTriggerTrack = 0x0;
 180   AliMUONTriggerTrack* matchedTriggerTrack = 0x0;
 181
 182
 183   // Covariance matrix 3x3 (X,Y,slopeY) for trigger tracks
 184   TMatrixD trackCov(3,3);
 185
 186   AliMUONTriggerTrack *triggerTrack;
 187   TIter itTriggerTrack(triggerTrackStore.CreateIterator());
 188   while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) )
 189   {
 190     AliMUONTrackExtrap::LinearExtrapToZCov(&trackParam, triggerTrack->GetZ11());
 191     const TMatrixD& kParamCov = trackParam.GetCovariances();
 192
 193     Double_t xTrack = trackParam.GetNonBendingCoor();
 194     Double_t yTrack = trackParam.GetBendingCoor();
 195     Double_t ySlopeTrack = trackParam.GetBendingSlope();
 196
 197     paramDiff(0,0) = triggerTrack->GetX11() - xTrack;
 198     paramDiff(1,0) = triggerTrack->GetY11() - yTrack;
 199     paramDiff(2,0) = triggerTrack->GetSlopeY() - ySlopeTrack;
 200
 201     // Covariance matrix 3x3 (X,Y,slopeY) for tracker tracks
 202     trackCov.Zero();
 203     trackCov(0,0) = kParamCov(0,0);
 204     trackCov(1,1) = kParamCov(2,2);
 205     trackCov(2,2) = kParamCov(3,3);
 206     trackCov(1,2) = kParamCov(2,3);
 207     trackCov(2,1) = kParamCov(3,2);
 208
 209     // Covariance matrix 3x3 (X,Y,slopeY) for trigger tracks
 210     TMatrixD trigCov(triggerTrack->GetCovariances());
 211
 212     TMatrixD sumCov(trackCov,TMatrixD::kPlus,trigCov);
 213     if (sumCov.Determinant() != 0) {
 214       sumCov.Invert();
 215
 216       TMatrixD tmp(sumCov,TMatrixD::kMult,paramDiff);
 217       TMatrixD chi2M(paramDiff,TMatrixD::kTransposeMult,tmp);
 218       chi2 = chi2M(0,0);
 219     } else {
 220       AliWarning(" Determinant = 0");
 221       Double_t sigma2 = 0.;
 222       chi2 = 0.;
 223       for (Int_t iVar = 0; iVar < 3; iVar++) {
 224         sigma2 = trackCov(iVar,iVar) + trigCov(iVar,iVar);
 225         chi2 += paramDiff(iVar,0) * paramDiff(iVar,0) / sigma2;
 226       }
 227     }
 228
 229     chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
 230     if (chi2 < GetRecoParam()->GetMaxNormChi2MatchTrigger())
 231     {
 232       Bool_t isDoubleTrack = (TMath::Abs(chi2 - minChi2MatchTrigger)<1.);
 233       if (chi2 < minChi2MatchTrigger && chi2 < GetRecoParam()->GetMaxNormChi2MatchTrigger())
 234       {
 235         if(isDoubleTrack)
 236         {
 237           doubleMatch = loTrgNum;
 238           doubleChi2 = chi2MatchTrigger;
 239           doubleTriggerTrack = matchedTriggerTrack;
 240         }
 241         minChi2MatchTrigger = chi2;
 242         chi2MatchTrigger = chi2;
 243         loTrgNum = triggerTrack->GetLoTrgNum();
 244         matchedTriggerTrack = triggerTrack;
 245         AliMUONLocalTrigger* locTrg = triggerStore.FindLocal(loTrgNum);
 246         matchTrigger = 1;
 247         if(locTrg->LoLpt()>0) matchTrigger = 2;
 248         if(locTrg->LoHpt()>0) matchTrigger = 3;
 249       }
 250       else if(isDoubleTrack)
 251       {
 252         doubleMatch = triggerTrack->GetLoTrgNum();
 253         doubleChi2 = chi2;
 254       }
 255     }
 256   }
 257   if(doubleMatch>=0)
 258   { // If two trigger tracks match, select the one passing more trigger cuts
 259     AliDebug(1, Form("Two candidates found: %i and %i",loTrgNum,doubleMatch));
 260     AliMUONLocalTrigger* locTrg1 = triggerStore.FindLocal(doubleMatch);
 261     if((locTrg1->LoLpt()>0 && matchTrigger<2) || (locTrg1->LoHpt() && matchTrigger<3))
 262     {
 263       if(locTrg1->LoHpt()>0) matchTrigger=3;
 264       else matchTrigger = 2;
 265       loTrgNum = doubleMatch;
 266       chi2MatchTrigger = doubleChi2;
 267       matchedTriggerTrack = doubleTriggerTrack;
 268     }
 269   }
 270
 271   track->SetMatchTrigger(matchTrigger);
 272   track->SetChi2MatchTrigger(chi2MatchTrigger);
 273
 274   AliMUONLocalTrigger* locTrg = static_cast<AliMUONLocalTrigger*>(triggerStore.FindLocal(loTrgNum));
 275
 276   if (locTrg)
 277   {
 278     track->SetLocalTrigger(locTrg->LoCircuit(),
 279                            locTrg->LoStripX(),
 280                            locTrg->LoStripY(),
 281                            locTrg->GetDeviation(),
 282                            locTrg->LoLpt(),
 283                            locTrg->LoHpt(),
 284                            locTrg->GetTriggerWithoutChamber());
 285   }
 286
 287   return matchedTriggerTrack;
 288 }
 289
 290
 291 //______________________________________________________________________________
 292 UShort_t AliMUONTrackHitPattern::GetHitPattern(AliMUONTriggerTrack* matchedTriggerTrack) const
 293 {
 294   //
 295   /// Get hit pattern on trigger chambers for the current trigger track
 296   //
 297   UShort_t pattern = 0;
 298   PerformTrigTrackMatch(pattern, matchedTriggerTrack);
 299   return pattern;
 300 }
 301
 302
 303 //______________________________________________________________________________
 304 UShort_t AliMUONTrackHitPattern::GetHitPattern(AliMUONTrackParam* trackParam) const
 305 {
 306   //
 307   /// Get hit pattern on trigger chambers for the current tracker track
 308   //
 309   UShort_t pattern = 0;
 310   Bool_t isMatch[2];
 311   const Int_t kNTrackingCh = AliMUONConstants::NTrackingCh();
 312
 313   for(Int_t ch=0; ch<4; ++ch)
 314   {
 315     Int_t iChamber = kNTrackingCh+ch;
 316     AliMUONTrackExtrap::ExtrapToZCov(trackParam, AliMUONConstants::DefaultChamberZ(iChamber));
 317     FindPadMatchingTrack(*trackParam, isMatch, iChamber);
 318     for(Int_t cath=0; cath<2; ++cath)
 319     {
 320       if(isMatch[cath]) AliESDMuonTrack::SetFiredChamber(pattern, cath, ch);
 321     }
 322   }
 323
 324   // pattern obtained by propagation of tracker track
 325   // when it does not match the trigger.
 326   AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackerTrackPattern);
 327
 328   return pattern;
 329 }
 330
 331 //______________________________________________________________________________
 332 void
 333 AliMUONTrackHitPattern::ApplyMCSCorrections(AliMUONTrackParam& trackParam) const
 334 {
 335   //
 336   /// Returns uncertainties on extrapolated position.
 337   /// Takes into account Branson plane corrections in the iron wall.
 338   //
 339
 340   const Float_t kZFilterOut = AliMUONConstants::MuonFilterZEnd();
 341   const Float_t kFilterThickness = kZFilterOut-AliMUONConstants::MuonFilterZBeg(); // cm
 342
 343   AliMUONTrackExtrap::ExtrapToZCov(&trackParam, kZFilterOut); // Extrap to muon filter end
 344   AliMUONTrackExtrap::AddMCSEffect(&trackParam, kFilterThickness, AliMUONConstants::MuonFilterX0()); // Add MCS effects
 345   return;
 346 }
 347
 348
 349 //______________________________________________________________________________
 350 void
 351 AliMUONTrackHitPattern::FindPadMatchingTrack(const AliMUONTrackParam& trackParam,
 352                                              Bool_t isMatch[2], Int_t iChamber) const
 353 {
 354     //
 355     /// Given the tracker track position, searches for matching digits.
 356     //
 357
 358     Float_t minMatchDist[2];
 359
 360     for(Int_t cath=0; cath<2; ++cath)
 361     {
 362       isMatch[cath]=kFALSE;
 363       minMatchDist[cath]=fkMaxDistance/10.;
 364     }
 365
 366     TIter next(fkDigitStore.CreateTriggerIterator());
 367     AliMUONVDigit* mDigit;
 368
 369     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 370     {
 371       Int_t currDetElemId = mDigit->DetElemId();
 372       Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 373       if(currCh!=iChamber) continue;
 374       Int_t cathode = mDigit->Cathode();
 375       Int_t ix = mDigit->PadX();
 376       Int_t iy = mDigit->PadY();
 377       Float_t xpad, ypad, zpad;
 378       const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 379         ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 380
 381       AliMpPad pad = seg->PadByIndices(ix,iy,kTRUE);
 382       Float_t xlocal1 = pad.GetPositionX();
 383       Float_t ylocal1 = pad.GetPositionY();
 384       Float_t dpx = pad.GetDimensionX();
 385       Float_t dpy = pad.GetDimensionY();
 386
 387       fkTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 388       Float_t matchDist = MinDistanceFromPad(xpad, ypad, zpad, dpx, dpy, trackParam);
 389       if(matchDist>minMatchDist[cathode])continue;
 390       isMatch[cathode] = kTRUE;
 391       if(isMatch[0] && isMatch[1]) break;
 392       minMatchDist[cathode] = matchDist;
 393     }
 394 }
 395
 396
 397 //______________________________________________________________________________
 398 Float_t
 399 AliMUONTrackHitPattern::MinDistanceFromPad(Float_t xPad, Float_t yPad, Float_t zPad,
 400                                            Float_t dpx, Float_t dpy,
 401                                            const AliMUONTrackParam& trackParam) const
 402 {
 403     //
 404     /// Decides if the digit belongs to the tracker track.
 405     //
 406
 407     AliMUONTrackParam trackParamAtPadZ(trackParam);
 408     AliMUONTrackExtrap::LinearExtrapToZCov(&trackParamAtPadZ, zPad);
 409
 410     Float_t xTrackAtPad = trackParamAtPadZ.GetNonBendingCoor();
 411     Float_t yTrackAtPad = trackParamAtPadZ.GetBendingCoor();
 412
 413     const Float_t kNSigma = GetRecoParam()->GetSigmaCutForTrigger();
 414
 415     const TMatrixD& kCovParam = trackParamAtPadZ.GetCovariances();
 416
 417     Float_t sigmaX = TMath::Sqrt(kCovParam(0,0));
 418     Float_t sigmaY = TMath::Sqrt(kCovParam(2,2));
 419
 420     Float_t maxDistX = kNSigma * sigmaX; // in cm
 421     Float_t maxDistY = kNSigma * sigmaY; // in cm
 422
 423     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 424     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 425
 426     Float_t matchDist = fkMaxDistance;
 427     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 428
 429     return matchDist;
 430 }
 431
 432
 433 //_____________________________________________________________________________
 434 Int_t AliMUONTrackHitPattern::FindPadMatchingTrig(Int_t &detElemId,
 435                                                   Float_t coor[2], Bool_t isMatch[2],
 436                                                   TArrayI nboard[2], TArrayF &zRealMatch, Float_t y11) const
 437 {
 438     //
 439     /// Check slat and board number of digit matching trigger track
 440     //
 441
 442     enum {kBending, kNonBending};
 443
 444     Float_t minMatchDist[fgkNcathodes];
 445     Int_t padsInCheckArea[fgkNcathodes];
 446
 447     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 448         isMatch[cath] = kFALSE;
 449         minMatchDist[cath] = fkMaxDistance/10.;
 450         padsInCheckArea[cath] = 0;
 451     }
 452     Int_t iChamber = AliMpDEManager::GetChamberId(detElemId);
 453     Int_t ch = iChamber-10;
 454     Float_t oldDeltaZ = AliMUONConstants::DefaultChamberZ(iChamber) - AliMUONConstants::DefaultChamberZ(10);
 455     Float_t y = coor[1];
 456     Int_t iSlat = detElemId%100;
 457     Int_t trigDigitBendPlane = -1;
 458     Int_t foundDetElemId = detElemId;
 459     Float_t foundZmatch=999.;
 460     Float_t yCoorAtPadZ=999.;
 461
 462     TIter next(fkDigitStore.CreateTriggerIterator());
 463     AliMUONVDigit* mDigit;
 464     Int_t idigit=0;
 465
 466     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 467     {
 468         idigit++;
 469         Int_t currDetElemId = mDigit->DetElemId();
 470         Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 471         if(currCh!=iChamber) continue;
 472         Int_t currSlat = currDetElemId%100;
 473         Int_t slatDiff = TMath::Abs(currSlat-iSlat);
 474         if(slatDiff>1 && slatDiff<17) continue; // Check neighbour slats
 475         Int_t cathode = mDigit->Cathode();
 476         Int_t ix = mDigit->PadX();
 477         Int_t iy = mDigit->PadY();
 478         Float_t xpad, ypad, zpad;
 479         const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 480             ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 481
 482         AliMpPad pad = seg->PadByIndices(ix,iy,kTRUE);
 483         Float_t xlocal1 = pad.GetPositionX();
 484         Float_t ylocal1 = pad.GetPositionY();
 485         Float_t dpx = pad.GetDimensionX();
 486         Float_t dpy = pad.GetDimensionY();
 487
 488         fkTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 489         AliDebug(2, Form("\nDetElemId = %i  Cathode = %i  Pad = (%i,%i) = (%.2f,%.2f)  Dim = (%.2f,%.2f)  Track = (%.2f,%.2f)\n",currDetElemId,cathode,ix,iy,xpad,ypad,dpx,dpy,coor[0],coor[1]));
 490         // searching track intersection with chambers (second approximation)
 491         if(ch%2==1){
 492             //if(iChamber%2==1){
 493             Float_t deltaZ = zpad - zRealMatch[0];
 494             y = (coor[1]-y11)*deltaZ/oldDeltaZ + y11;
 495             if(TMath::Abs(y-coor[1])>0.1) AliDebug(3, Form("oldDeltaZ = %7.2f   newDeltaZ = %7.2f\toldY = %7.2f   new y = %7.2f\n",oldDeltaZ,deltaZ,coor[1],y));
 496         }
 497         Float_t matchDist = PadMatchTrack(xpad, ypad, dpx, dpy, coor[0], y);
 498         if(matchDist<fkMaxDistance/2.) padsInCheckArea[cathode]++;
 499         if(matchDist>minMatchDist[cathode])continue;
 500         isMatch[cathode] = kTRUE;
 501         minMatchDist[cathode] = matchDist;
 502         foundDetElemId = currDetElemId;
 503         foundZmatch=zpad;
 504         yCoorAtPadZ=y;
 505         if(cathode==kBending) trigDigitBendPlane = idigit;
 506         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 507             nboard[cathode][loc] = pad.GetLocalBoardId(loc);
 508         }
 509         for(Int_t loc=pad.GetNofLocations(); loc<fgkNlocations; loc++){
 510             nboard[cathode][loc]=-1;
 511         }
 512     }
 513
 514     if(isMatch[kBending] || isMatch[kNonBending]){
 515         detElemId = foundDetElemId;
 516         zRealMatch[ch] = foundZmatch;
 517         coor[1] = yCoorAtPadZ;
 518     }
 519
 520     // If track matches many pads, it is not good for effciency determination.
 521     // However we still want to calculate the hit pattern.
 522     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 523       if(padsInCheckArea[cath]>2) {
 524         AliDebug(1, Form("padsInCheckArea[%i] = %i\n",cath,padsInCheckArea[cath]));
 525         return -500;
 526       }
 527     }
 528
 529     return trigDigitBendPlane;
 530 }
 531
 532 //_____________________________________________________________________________
 533 Float_t AliMUONTrackHitPattern::PadMatchTrack(Float_t xPad, Float_t yPad,
 534                                                 Float_t dpx, Float_t dpy,
 535                                                 Float_t xTrackAtPad, Float_t yTrackAtPad) const
 536 {
 537     //
 538     /// Decides if the digit belongs to the trigger track.
 539     //
 540
 541   Float_t maxDist = GetRecoParam()->GetStripCutForTrigger() * 2. * TMath::Min(dpx,dpy); // cm
 542   if(maxDist<2.) maxDist = 2.;
 543   Float_t maxDistCheckArea = GetRecoParam()->GetMaxStripAreaForTrigger() * 2. *  TMath::Min(dpx,dpy); // cm
 544
 545     Float_t matchDist = fkMaxDistance;
 546
 547     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 548     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 549     Float_t maxDistX = maxDist;
 550     Float_t maxDistY = maxDist;
 551
 552     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 553     else if(deltaX<=maxDistCheckArea && deltaY<=maxDistCheckArea) matchDist = fkMaxDistance/5.;
 554     return matchDist;
 555 }
 556
 557
 558 //_____________________________________________________________________________
 559 Int_t AliMUONTrackHitPattern::DetElemIdFromPos(Float_t x, Float_t y,
 560                                                  Int_t chamber, Int_t cathode) const
 561 {
 562     //
 563     /// Given the (x,y) position in the chamber,
 564     /// it returns the corresponding slat
 565     //
 566
 567     Int_t resultingDetElemId = -1;
 568     AliMpDEIterator it;
 569     Float_t minDist = 999.;
 570     for ( it.First(chamber-1); ! it.IsDone(); it.Next() ){
 571         Int_t detElemId = it.CurrentDEId();
 572         Int_t ich = detElemId/100-10;
 573         Float_t tolerance=0.2*((Float_t)ich);
 574         Float_t currDist=9999.;
 575
 576         const AliMpVSegmentation* seg =
 577             AliMpSegmentation::Instance()
 578             ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 579         if (!seg) continue;
 580
 581         Float_t deltax = seg->GetDimensionX();
 582         Float_t deltay = seg->GetDimensionY();
 583         Float_t xlocal1 =  -deltax;
 584         Float_t ylocal1 =  -deltay;
 585         Float_t xlocal2 =  +deltax;
 586         Float_t ylocal2 =  +deltay;
 587         Float_t xg01, yg01, zg1, xg02, yg02, zg2;
 588         fkTransformer.Local2Global(detElemId, xlocal1, ylocal1, 0, xg01, yg01, zg1);
 589         fkTransformer.Local2Global(detElemId, xlocal2, ylocal2, 0, xg02, yg02, zg2);
 590
 591         Float_t xg1 = xg01, xg2 = xg02, yg1 = yg01, yg2 = yg02;
 592
 593         if(xg01>xg02){
 594             xg1 = xg02;
 595             xg2 = xg01;
 596         }
 597         if(yg01>yg02){
 598             yg1 = yg02;
 599             yg2 = yg01;
 600         }
 601
 602         if(x>=xg1-tolerance && x<=xg2+tolerance && y>=yg1-tolerance && y<=yg2+tolerance){ // takes into account errors in extrapolation
 603             if(y<yg1) currDist = yg1-y;
 604             else if(y>yg2) currDist = y-yg2;
 605             if(currDist<minDist) {
 606                 resultingDetElemId = detElemId;
 607                 minDist=currDist;
 608                 continue;
 609             }
 610             resultingDetElemId = detElemId;
 611             break;
 612         }
 613     } // loop on detElemId
 614     return resultingDetElemId;
 615 }
 616
 617
 618 //_____________________________________________________________________________
 619 void AliMUONTrackHitPattern::LocalBoardFromPos(Float_t x, Float_t y,
 620                                                  Int_t detElemId, Int_t cathode,
 621                                                  Int_t localBoard[4]) const
 622 {
 623     //
 624     /// Given the (x,y) position in the chamber,
 625     /// it returns the corresponding local board
 626     //
 627
 628     for(Int_t loc=0; loc<fgkNlocations; loc++){
 629         localBoard[loc]=-1;
 630     }
 631     Float_t xg, yg, zg;
 632     fkTransformer.Local2Global(detElemId, 0., 0., 0., xg, yg, zg);
 633     Float_t z = zg - (y-yg)*TMath::Tan(TMath::DegToRad()*AliMUONConstants::St345Inclination());
 634     Float_t xl, yl, zl;
 635     fkTransformer.Global2Local(detElemId, x, y, z, xl, yl, zl);
 636     const AliMpVSegmentation* seg =
 637         AliMpSegmentation::Instance()
 638           ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 639     if ( ! seg ) return;
 640     AliMpPad pad = seg->PadByPosition(xl,yl,kFALSE);
 641     if ( ! pad.IsValid() ){
 642       AliWarning(Form("Pad not found! DetElemId %i  position global (%f, %f, %f)  local (%f, %f, %f)\n", detElemId, x, y, z, xl, yl, zl));
 643       return;
 644     }
 645
 646     AliDebug(2, Form("\nWould match: DetElemId = %i  Pad = (%i,%i) = (%.2f,%.2f,%.2f)   Board %3i\n",detElemId,pad.GetIx(),pad.GetIy(),xl,yl,zl,pad.GetLocalBoardId(0)));
 647
 648     for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 649       localBoard[loc] = pad.GetLocalBoardId(loc);
 650     }
 651 }
 652
 653
 654 //_____________________________________________________________________________
 655 Bool_t AliMUONTrackHitPattern::PerformTrigTrackMatch(UShort_t &pattern,
 656                                                      const AliMUONTriggerTrack* matchedTrigTrack) const
 657 {
 658   //
 659   /// It searches for matching digits around the trigger track.
 660   //
 661
 662   enum {kBending, kNonBending};
 663
 664   Int_t chOrder[fgkNchambers] = {0,2,1,3};
 665
 666   TArrayF zRealMatch(fgkNchambers);
 667
 668   Bool_t isMatch[fgkNcathodes];
 669   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 670     isMatch[cath] = kFALSE;
 671   }
 672
 673   TArrayF zMeanChamber(fgkNchambers);
 674   zMeanChamber[0] = matchedTrigTrack->GetZ11();
 675   zMeanChamber[1] = matchedTrigTrack->GetZ11() + AliMUONConstants::DefaultChamberZ(11) - AliMUONConstants::DefaultChamberZ(10);
 676   zMeanChamber[2] = matchedTrigTrack->GetZ21();
 677   zMeanChamber[3] = matchedTrigTrack->GetZ21() + AliMUONConstants::DefaultChamberZ(13) - AliMUONConstants::DefaultChamberZ(12);
 678
 679   TArrayI digitPerTrack(fgkNcathodes);
 680
 681   Float_t trackIntersectCh[fgkNchambers][fgkNcathodes];
 682
 683   TArrayI triggeredDigits;
 684   triggeredDigits.Set(fgkNchambers);
 685   triggeredDigits.Reset(-1);
 686
 687   TArrayI trigScheme[fgkNcathodes];
 688   TArrayI slatThatTriggered[fgkNcathodes];
 689   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 690     trigScheme[cath].Set(fgkNchambers);
 691     slatThatTriggered[cath].Set(fgkNchambers);
 692   }
 693
 694   Int_t boardThatTriggered[fgkNchambers][fgkNcathodes][fgkNlocations];
 695   TArrayI nboard[fgkNcathodes];
 696   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 697     nboard[cath].Set(fgkNlocations);
 698   }
 699   Int_t ineffBoard[fgkNlocations];
 700   for(Int_t loc=0; loc<fgkNlocations; loc++){
 701     ineffBoard[loc] = -1;
 702   }
 703
 704   digitPerTrack.Reset();
 705   for(Int_t ch=0; ch<fgkNchambers; ch++){
 706     zRealMatch[ch] = zMeanChamber[ch];
 707     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 708       for(Int_t loc=0; loc<fgkNlocations; loc++){
 709         boardThatTriggered[ch][cath][loc]=-1;
 710       }
 711     }
 712   }
 713
 714   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 715     slatThatTriggered[cath].Reset(-1);
 716     trigScheme[cath].Reset();
 717   }
 718
 719   Bool_t isClearEvent = kTRUE;
 720
 721   Float_t y11 = matchedTrigTrack->GetY11();// y position (info from bending plane)
 722   Float_t slopeX = matchedTrigTrack->GetSlopeX();
 723   Float_t slopeY = matchedTrigTrack->GetSlopeY();
 724
 725   for(Int_t ch=0; ch<fgkNchambers; ch++) { // chamber loop
 726     Int_t currCh = chOrder[ch];
 727     AliDebug(3, Form("zMeanChamber[%i] = %.2f\tzRealMatch[0] = %.2f\n",currCh,zMeanChamber[currCh],zRealMatch[0]));
 728
 729     // searching track intersection with chambers (first approximation)
 730     Float_t deltaZ = zMeanChamber[currCh] - zMeanChamber[0];
 731     trackIntersectCh[currCh][0] = zMeanChamber[currCh] * slopeX;
 732     trackIntersectCh[currCh][1] = y11 + deltaZ * slopeY;
 733     Int_t detElemIdFromTrack = DetElemIdFromPos(trackIntersectCh[currCh][0], trackIntersectCh[currCh][1], 11+currCh, 0);
 734     if(detElemIdFromTrack<0) {
 735       AliDebug(1, "Warning: trigger track outside trigger chamber\n");
 736       isClearEvent = kFALSE;
 737
 738       // track is rejected since the extrapolated track
 739       // does not match a slat (border effects)
 740       AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackOutsideGeometry);
 741       continue;
 742     }
 743
 744     triggeredDigits[currCh] = FindPadMatchingTrig(detElemIdFromTrack, trackIntersectCh[currCh], isMatch, nboard, zRealMatch, y11);
 745
 746     // if FindPadMatchingTrig = -500 => too many digits matching pad =>
 747     //                               => Event not clear => Do not use for efficiency calculation
 748     if(triggeredDigits[currCh]<-100){
 749       isClearEvent = kFALSE;
 750       // track is rejected since it matches many pads
 751       AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackMatchesManyPads);
 752       AliDebug(1, Form("Warning: track = %p (%i) matches many pads. Rejected!\n",(void *)matchedTrigTrack, detElemIdFromTrack));
 753     }
 754
 755     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 756       if(!isMatch[cath]) continue;
 757       AliESDMuonTrack::SetFiredChamber(pattern, cath, currCh);
 758       digitPerTrack[cath]++;
 759       trigScheme[cath][currCh]++;
 760       slatThatTriggered[cath][currCh] = detElemIdFromTrack;
 761       for(Int_t loc=0; loc<fgkNlocations; loc++){
 762         boardThatTriggered[currCh][cath][loc] = nboard[cath][loc];
 763       }
 764     }
 765   } // end chamber loop
 766
 767   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 768     if(digitPerTrack[cath]<3) {
 769       isClearEvent = kFALSE;
 770       // track is rejected since the number of associated
 771       // digits found is less than 3.
 772       AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackMatchesFewPads);
 773       AliDebug(1, Form("Warning: found %i digits for trigger track cathode %i.\nRejecting event\n", digitPerTrack[cath],cath));
 774     }
 775   }
 776
 777   if(!isClearEvent) return kFALSE;
 778
 779   AliESDMuonTrack::EAliTriggerChPatternFlag goodForEff = AliESDMuonTrack::kBoardEff;
 780
 781   Int_t ineffSlat = -1;
 782   Int_t ineffDetElId = -1;
 783   Int_t firstSlat = slatThatTriggered[kBending][0]%100;
 784   if(firstSlat<0) firstSlat = slatThatTriggered[kBending][1]%100;
 785   Int_t firstBoard = boardThatTriggered[0][kBending][0];
 786   if(firstBoard<0) firstBoard = boardThatTriggered[1][kBending][0];
 787   for(Int_t ch=0; ch<fgkNchambers; ch++){
 788     Bool_t isCurrChIneff = kFALSE;
 789     Int_t currSlat = slatThatTriggered[kBending][ch]%100;
 790     if(currSlat<0){
 791       ineffDetElId = DetElemIdFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], 11+ch, kBending);
 792       currSlat = ineffDetElId%100;
 793       ineffSlat = currSlat;
 794       isCurrChIneff = kTRUE;
 795     }
 796     if(currSlat!=firstSlat) {
 797       AliESDMuonTrack::AddEffInfo(pattern,
 798                                   AliESDMuonTrack::kCrossDifferentSlats,
 799                                   AliESDMuonTrack::kChEff); // track crosses different slats
 800       return kTRUE;
 801     }
 802     Bool_t atLeastOneLoc=kFALSE;
 803     if(isCurrChIneff) LocalBoardFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], ineffDetElId, kBending, ineffBoard);
 804     for(Int_t loc=0; loc<fgkNlocations; loc++){
 805       Int_t currBoard = boardThatTriggered[ch][kBending][loc];
 806       if(isCurrChIneff) currBoard = ineffBoard[loc];
 807       if(currBoard==firstBoard){
 808         atLeastOneLoc=kTRUE;
 809         break;
 810       }
 811     }
 812     if(!atLeastOneLoc) goodForEff = AliESDMuonTrack::kSlatEff;
 813   } // end chamber loop
 814
 815   AliESDMuonTrack::AddEffInfo(pattern, firstSlat, goodForEff);
 816   return kTRUE;
 817 }