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Add the utility codes for the MFT-MUON matching
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‎Detectors/ITSMFT/MFT/CMakeLists.txt‎

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@@ -18,5 +18,6 @@ add_subdirectory(calibration)
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add_subdirectory(condition)
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add_subdirectory(assessment)
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add_subdirectory(alignment)
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add_subdirectory(matching)
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o2_data_file(COPY data DESTINATION Detectors/Geometry/MFT/)

‎Detectors/ITSMFT/MFT/matching/CMakeLists.txt‎

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
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// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
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// All rights not expressly granted are reserved.
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//
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// This software is distributed under the terms of the GNU General Public
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// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
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//
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// In applying this license CERN does not waive the privileges and immunities
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// granted to it by virtue of its status as an Intergovernmental Organization
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// or submit itself to any jurisdiction.
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o2_add_library(MFTMuonMatching
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SOURCES src/MftMuonMatchingUtils.cxx
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src/MatchingTagAndProbe.cxx
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PUBLIC_LINK_LIBRARIES O2::CCDB
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O2::DataFormatsMFT
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O2::DetectorsCalibration
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O2::DetectorsDCS
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O2::GlobalTracking
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O2::ReconstructionDataFormats
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O2::DataFormatsGlobalTracking
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Microsoft.GSL::GSL)

‎Detectors/ITSMFT/MFT/matching/README.md‎

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<!-- doxy
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\page refMFTMuonMatching Matching
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/doxy -->
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# MFT Matching

‎Detectors/ITSMFT/MFT/matching/include/MFTMuonMatching/MatchingTagAndProbe.h‎

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
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// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
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// All rights not expressly granted are reserved.
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//
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// This software is distributed under the terms of the GNU General Public
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// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
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//
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// In applying this license CERN does not waive the privileges and immunities
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// granted to it by virtue of its status as an Intergovernmental Organization
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// or submit itself to any jurisdiction.
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/// @file MatchingTagAndProbe.h
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#ifndef O2_MFT_MATCHING_TAG_AND_PROBE_H
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#define O2_MFT_MATCHING_TAG_AND_PROBE_H
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/// @file MatchingTagAndProbe.h
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/// @brief Template-based utility for finding Tag and Probe pairs in ALICE O2.
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#include <cmath>
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#include "Math/SMatrix.h"
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#include "Math/SVector.h"
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#include "TLorentzVector.h"
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#include "Framework/Logger.h"
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#include "DetectorsBase/Propagator.h"
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#include "MCHTracking/TrackExtrap.h"
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#include "ReconstructionDataFormats/GlobalFwdTrack.h"
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#include "GlobalTracking/MatchGlobalFwd.h"
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namespace o2
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{
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namespace mft
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{
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using SMatrix55 = ROOT::Math::SMatrix<double, 5, 5, ROOT::Math::MatRepSym<double, 5>>;
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using SMatrix5 = ROOT::Math::SVector<Double_t, 5>;
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template <typename MUON, typename Collision>
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class MatchingTagAndProbe
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{
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private:
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inline void fillCovarianceArray(MUON const& muontrack, float cov[15]) const
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{
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cov[0] = muontrack.cXX();
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cov[1] = muontrack.cXY();
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cov[2] = muontrack.cYY();
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cov[3] = muontrack.cPhiX();
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cov[4] = muontrack.cPhiY();
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cov[5] = muontrack.cPhiPhi();
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cov[6] = muontrack.cTglX();
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cov[7] = muontrack.cTglY();
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cov[8] = muontrack.cTglPhi();
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cov[9] = muontrack.cTglTgl();
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cov[10] = muontrack.c1PtX();
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cov[11] = muontrack.c1PtY();
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cov[12] = muontrack.c1PtPhi();
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cov[13] = muontrack.c1PtTgl();
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cov[14] = muontrack.c1Pt21Pt2();
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}
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inline void setTagAndProbe()
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{
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if (muontrack1.pt() > muontrack2.pt()) {
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tagIdx = 0;
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probeIdx = 1;
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} else {
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tagIdx = 1;
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probeIdx = 0;
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}
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}
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o2::dataformats::GlobalFwdTrack muontrack_at_pv[2];
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TLorentzVector mDimuon;
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MUON muontrack1;
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MUON muontrack2;
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Collision collision;
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int tagIdx, probeIdx;
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int16_t mQ;
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const float mMu = 0.105658; // Muon mass (GeV/c^2)
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inline o2::dataformats::GlobalFwdTrack propagateMUONtoPV(MUON const& muontrack) const
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{
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const double mz = muontrack.z();
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const double mchi2 = muontrack.chi2();
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const float mx = muontrack.x();
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const float my = muontrack.y();
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const float mphi = muontrack.phi();
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const float mtgl = muontrack.tgl();
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const float m1pt = muontrack.signed1Pt();
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float cov[15];
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fillCovarianceArray(muontrack, cov);
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SMatrix5 tpars(mx, my, mphi, mtgl, m1pt);
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SMatrix55 tcovs(cov, cov + 15);
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o2::track::TrackParCovFwd parcovmuontrack{mz, tpars, tcovs, mchi2};
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o2::dataformats::GlobalFwdTrack gtrack;
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gtrack.setParameters(tpars);
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gtrack.setZ(parcovmuontrack.getZ());
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gtrack.setCovariances(tcovs);
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o2::globaltracking::MatchGlobalFwd mMatching;
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auto mchtrack = mMatching.FwdtoMCH(gtrack);
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o2::mch::TrackExtrap::extrapToVertex(mchtrack,
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collision.posX(),
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collision.posY(),
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collision.posZ(),
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collision.covXX(),
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collision.covYY());
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auto fwdtrack = mMatching.MCHtoFwd(mchtrack);
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o2::dataformats::GlobalFwdTrack extrap_muontrack;
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extrap_muontrack.setParameters(fwdtrack.getParameters());
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extrap_muontrack.setZ(fwdtrack.getZ());
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extrap_muontrack.setCovariances(fwdtrack.getCovariances());
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return extrap_muontrack;
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}
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public:
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MatchingTagAndProbe(const MUON& muon1, const MUON& muon2, const Collision& coll) : muontrack1(muon1), muontrack2(muon2), collision(coll), tagIdx(-1), probeIdx(-1), mQ(0)
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{
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mQ = muontrack1.sign() + muontrack2.sign();
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setTagAndProbe();
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}
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inline void calcMuonPairAtPV()
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{
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muontrack_at_pv[0] = propagateMUONtoPV(muontrack1);
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muontrack_at_pv[1] = propagateMUONtoPV(muontrack2);
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TLorentzVector vMuon1, vMuon2;
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vMuon1.SetPtEtaPhiM(muontrack_at_pv[0].getPt(),
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muontrack_at_pv[0].getEta(),
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muontrack_at_pv[0].getPhi(),
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mMu);
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vMuon2.SetPtEtaPhiM(muontrack_at_pv[1].getPt(),
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muontrack_at_pv[1].getEta(),
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muontrack_at_pv[1].getPhi(),
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mMu);
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mDimuon = vMuon1 + vMuon2;
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}
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inline int getTagMuonIndex() const { return tagIdx; }
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inline int getProbeMuonIndex() const { return probeIdx; }
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inline float getMass() const { return mDimuon.M(); }
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inline float getPt() const { return mDimuon.Pt(); }
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inline float getRap() const { return mDimuon.Rapidity(); }
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inline int16_t getCharge() const { return mQ; }
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inline const o2::dataformats::GlobalFwdTrack& getMuonAtPV(int idx) const
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{
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return muontrack_at_pv[idx];
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}
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}; // end of class MatchingTagAndProbe
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} // namespace mft
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} // namespace o2
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#endif // O2_MFT_MATCHING_TAG_AND_PROBE_H

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