+++ /dev/null
-/**************************************************************************
- * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
- * *
- * Author: The ALICE Off-line Project. *
- * Contributors are mentioned in the code where appropriate. *
- * *
- * Permission to use, copy, modify and distribute this software and its *
- * documentation strictly for non-commercial purposes is hereby granted *
- * without fee, provided that the above copyright notice appears in all *
- * copies and that both the copyright notice and this permission notice *
- * appear in the supporting documentation. The authors make no claims *
- * about the suitability of this software for any purpose. It is *
- * provided "as is" without express or implied warranty. *
- **************************************************************************/
-
-
-///////////////////////////////////////////////////////////////////////////////
-// //
-// Redo primary vertex on the fly, using the diamond constraint //
-// //
-///////////////////////////////////////////////////////////////////////////////
-
-#include <TSystem.h>
-#include "AliESDEvent.h"
-#include "AliTender.h"
-#include "AliVParticle.h"
-#include "AliLog.h"
-#include "AliOADBContainer.h"
-#include "AliAnalysisManager.h"
-#include "AliTrackFixTenderSupply.h"
-#include "AliOADBTrackFix.h"
-
-ClassImp(AliTrackFixTenderSupply)
-
-AliTrackFixTenderSupply::AliTrackFixTenderSupply() :
-fDebug(0),
- fBz(0),
- fParams(0),
- fOADBObjPath("$OADB/PWGPP/data/CorrPTInv.root"),
- fOADBObjName("CorrPTInv"),
- fOADBCont(0)
-{
- // default ctor
-}
-
-//_____________________________________________________
-AliTrackFixTenderSupply::AliTrackFixTenderSupply(const char *name, const AliTender *tender) :
- AliTenderSupply(name,tender),
- fDebug(0),
- fBz(0),
- fParams(0),
- fOADBObjPath("$OADB/PWGPP/data/CorrPTInv.root"),
- fOADBObjName("CorrPTInv"),
- fOADBCont(0)
-{
- // named ctor
- //
-}
-
-//_____________________________________________________
-AliTrackFixTenderSupply::~AliTrackFixTenderSupply()
-{
- // d-tor
- delete fOADBCont;
-}
-
-
-//_____________________________________________________
-void AliTrackFixTenderSupply::ProcessEvent()
-{
- //
- // Fix track kinematics
- //
- AliESDEvent *event=fTender->GetEvent();
- if (!event) return;
- //
- if (fTender->RunChanged() && !GetRunCorrections(fTender->GetRun())) return;
- //
- int nTracks = event->GetNumberOfTracks();
- fBz = event->GetMagneticField();
- if (TMath::Abs(fBz) < kAlmost0Field) return;
- //
- const AliESDVertex *vtx = 0, *vtxTPC = 0;
- //
- vtx = event->GetPrimaryVertexTracks(); // vertex to be used for update via RelateToVertex
- if (!vtx || vtx->GetStatus()<1) {
- vtx = event->GetPrimaryVertexSPD();
- if (vtx && vtx->GetStatus()<1) vtx = 0;
- }
- vtxTPC = event->GetPrimaryVertexTPC(); // vertex to be used for update via RelateToVertexTPC
- if (vtxTPC && vtxTPC->GetStatus()<1) vtxTPC = 0;
- //
- AliExternalTrackParam* extPar = 0;
- double xOrig = 0;
- double xyzTPCInner[3] = {0,0,0};
- for (int itr=0;itr<nTracks;itr++) {
- //
- AliESDtrack* trc = event->GetTrack(itr);
- if (!trc->IsOn(AliESDtrack::kTPCin)) continue;
- //
- double sideAfraction = GetSideAFraction(trc);
- // correct the main parameterization
- int cormode = trc->IsOn(AliESDtrack::kITSin) ? AliOADBTrackFix::kCorModeGlob : AliOADBTrackFix::kCorModeTPCInner;
- xOrig = trc->GetX();
- double xIniCor = fParams->GetXIniPtInvCorr(cormode);
- const AliExternalTrackParam* parInner = trc->GetInnerParam();
- if (!parInner) {
- AliError("Failed to extract inner param");
- continue;
- }
- parInner->GetXYZ(xyzTPCInner);
- double phi = TMath::ATan2(xyzTPCInner[1],xyzTPCInner[0]);
- if (phi<0) phi += 2*TMath::Pi();
- //
- if (fDebug>1) {
- AliInfo(Form("Tr:%4d kITSin:%d Phi=%+5.2f at X=%+7.2f | SideA fraction: %.3f",itr,trc->IsOn(AliESDtrack::kITSin),phi,parInner->GetX(),sideAfraction));
- AliInfo(Form("Main Param before corr. in mode %s, xIni:%.1f",cormode== AliOADBTrackFix::kCorModeGlob ? "Glo":"TPC",xIniCor));
- trc->AliExternalTrackParam::Print();
- }
- //
- if (xIniCor>0) trc->PropagateTo(xIniCor,fBz);
- CorrectTrackPtInv(trc, cormode, sideAfraction, phi);
- if (xIniCor>0) { // full update is requested
- if (vtx) trc->RelateToVertex(vtx, fBz, kVeryBig); // redo DCA if vtx is available
- else trc->PropagateTo(xOrig, fBz); // otherwise bring to original point
- }
- //
- if (fDebug>1) {
- AliInfo("Main Param after corr.");
- trc->AliExternalTrackParam::Print();
- }
- // correct TPCinner param
- if ( (extPar=(AliExternalTrackParam*)trc->GetTPCInnerParam()) ) {
- cormode = AliOADBTrackFix::kCorModeTPCInner;
- xOrig = extPar->GetX();
- xIniCor = fParams->GetXIniPtInvCorr(cormode);
- if (fDebug>1) {
- AliInfo(Form("TPCinner Param before corr. in mode %s, xIni:%.1f",cormode== AliOADBTrackFix::kCorModeGlob ? "Glo":"TPC",xIniCor));
- extPar->AliExternalTrackParam::Print();
- }
- //
- if (xIniCor>0) extPar->PropagateTo(xIniCor,fBz);
- CorrectTrackPtInv(extPar,cormode,sideAfraction, phi);
- if (xIniCor>0) { // full update is requested
- if (vtxTPC) trc->RelateToVertexTPC(vtxTPC, fBz, kVeryBig); // redo DCA if vtx is available
- else extPar->PropagateTo(xOrig, fBz); // otherwise bring to original point
- }
- //
- if (fDebug>1) {
- AliInfo("TPCinner Param after corr.");
- extPar->AliExternalTrackParam::Print();
- }
- }
- //
- }
- //
-}
-
-//_____________________________________________________
-void AliTrackFixTenderSupply::CorrectTrackPtInv(AliExternalTrackParam* trc, Int_t mode, double sideAfraction, double phi) const
-{
- // fix track kinematics
- if (!trc) return;
- double *param = (double*)trc->GetParameter();
- param[4] += fParams->GetPtInvCorr(mode,sideAfraction,phi);
- //
-}
-
-//_____________________________________________________
-Bool_t AliTrackFixTenderSupply::LoadOADBObjects()
-{
- // Load OADB parameters
- TString fileName = fOADBObjPath;
- if (fileName.BeginsWith("$OADB")) fileName.ReplaceAll("$OADB",Form("%s/",AliAnalysisManager::GetOADBPath()));
- gSystem->ExpandPathName(fileName);
- AliInfo(Form("Loading correction parameters %s from %s",fOADBObjName.Data(),fileName.Data()));
- //
- fOADBCont = new AliOADBContainer("OADB");
- if (fOADBCont->InitFromFile(fileName.Data(),fOADBObjName.Data())) {
- AliError("Failed to load OADB Container");
- delete fOADBCont;
- fOADBCont = 0;
- return kFALSE;
- }
- //
- return kTRUE;
-}
-
-//_____________________________________________________
-Bool_t AliTrackFixTenderSupply::GetRunCorrections(int run)
-{
- // extract corrections for given run
- fParams = 0;
- if (!fOADBCont) if (!LoadOADBObjects()) return kFALSE;
- fParams = dynamic_cast<AliOADBTrackFix*>(fOADBCont->GetObject(run,"default"));
- if (!fParams) {AliError(Form("No correction parameters for found for run %d",run)); return kFALSE;}
- AliInfo(Form("Loaded correction parameters for run %d",run));
- //
- return kTRUE;
-}
-
-//_____________________________________________________
-Double_t AliTrackFixTenderSupply::GetSideAFraction(const AliESDtrack* track) const
-{
- // decide A-side fraction of trajectory length in TPC
- // for the moment just a placeholder...
- //
- const AliExternalTrackParam *trIn = track->GetInnerParam();
- if (!trIn) {AliError("Failed to onbtain InnerParam"); return 0.5;}
- //
- // easy cases:
- double sideAfrac = 0.5;
- if (trIn->GetZ()>0) { sideAfrac = 1.; if (trIn->GetTgl()>-kAlmost0) return sideAfrac;}
- else if (trIn->GetZ()<0) { sideAfrac = 0.; if (trIn->GetTgl()< kAlmost0) return sideAfrac;}
- //
- // track may cross the membrane
- // convert to usual helix param:
- // x(t)=(dca+R)*cos(phi0) -R*cos(t+phi0);
- // y(t)=(dca+R)*sin(phi0) -R*sin(t+phi0);
- // z(t)=z0 - R*t*tgl
- //
- int sqb = fBz<0 ? -trIn->Charge() : trIn->Charge();
- double radq = TMath::Abs(trIn->GetC(fBz));
- radq = radq>kAlmost0 ? 1./radq : 1e4; // track radius
- if (sqb<0) radq = -radq;
- double cstCphi0 = trIn->GetSnp(); // tC is current t
- double sntCphi0 = -TMath::Sqrt((1.-cstCphi0)*(1+cstCphi0));
- double xc0 = trIn->GetX() + radq*cstCphi0; // circle center
- double yc0 = trIn->GetY() + radq*sntCphi0;
- double phi0 = TMath::ATan2( yc0, xc0);
- if (sqb<0) phi0 += TMath::Pi();
- if (phi0 > TMath::Pi()) phi0 -= 2.*TMath::Pi();
- else if (phi0 <-TMath::Pi()) phi0 += 2.*TMath::Pi();
- //
- double csphi0 = TMath::Cos(phi0);
- double snphi0 = TMath::Sin(phi0);
- double dca = xc0*csphi0 + yc0*snphi0 - radq;
- double tC = TMath::ATan2(sntCphi0,cstCphi0) - phi0;
- double tglR = radq*trIn->GetTgl();
- double z0 = trIn->GetZ() + tglR*tC;
- Double_t tCross = z0/tglR; // Z=0 is crossed at this t
- // t is changed withing tCross:2pi range for the track moving forward
- if (tCross<tC || tCross>TMath::Pi()) return sideAfrac; // on the way forward does not cross the membrane
- //
- // find max t reached by the track in the TPC
- const double kROutTPC2 = 250.*250.;
- // find t at which the outer radius is crossed
- // r^2 = (dca+R)^2 + R^2 - 2R(R+dca)*cos(t)
- double dcaR = dca+radq;
- double rmax2 = dcaR*dcaR + radq*radq + 2*radq*dcaR; // max rad at t=pi
- double tmax = TMath::Pi();
- if (rmax2>kROutTPC2) { // traverses full TPC
- double ct = 0.5*(dcaR/radq + radq/dcaR - kROutTPC2/radq/dcaR);
- if (TMath::Abs(ct)<1-kAlmost0) tmax = TMath::ACos(ct);
- }
- if (tmax<tCross) return sideAfrac; // does not cross z=0
- sideAfrac = sideAfrac>0.5 ? (tCross-tC)/(tmax-tC) : 1.-(tCross-tC)/(tmax-tC);
- return sideAfrac;
-}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff