MuonSegmentMatchingTool.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "MuonSegmentMatchingTool.h"
 
#include <cmath>
#include <iostream>
 
#include "MuonSegment/MuonSegment.h"
 
namespace Muon {
 
using StIndex = MuonStationIndex::StIndex; 
 
MuonSegmentMatchingTool::MuonSegmentMatchingTool(const std::string& ty, const std::string& na, const IInterface* pa)
    : base_class(ty, na, pa) {
    declareProperty("UseCosmicsSettings", m_isCosmics = false, "Pick up settings for cosmics");
    declareProperty("DoOverlapMatch", m_doOverlapMatch = true,
                    "Perform matching for segments in a small/large overlap");
    declareProperty("DoStraightLineMatch", m_doStraightLineMatch = true,
                    "Perform matching for segments in regions without field");
    declareProperty("DoCurvedMatch", m_doCurvedMatch = true, "Perform matching for segments in a field regions");
    declareProperty("doThetaMatching", m_thetaMatch = false, "Pre-matching in theta");
    declareProperty("doPhiMatching", m_phiMatch = false, "Pre-matching in phi");
 
    declareProperty(
        "OverlapMatchAngleDPhiCut", m_overlapMatchAngleDPhiCut = 0.15,
        "Cut on the angular difference between the best phi and the one consistent with the chamber bounds");
    declareProperty(
        "OverlapMatchAngleDYZCut", m_overlapMatchAngleDYZCut = 0.05,
        "Cut on the angular difference between the best phi and the one consistent with the chamber bounds");
    declareProperty("OverlapMatchPositionCut", m_overlapMatchPositionCut = 100.,
                    "Cut on the distance of recalculated position to the tube edge");
    declareProperty("OverlapMatchPositionResidualCut", m_overlapMatchPositionResidualCut = 30.,
                    "Cut on the segment position residual after recalculation of the paramters");
    declareProperty("OverlapMatchAveragePhiHitPullCut", m_overlapMatchPhiHitPullCut = 20.,
                    "Cut on the average pull of the phi hits with the new segment parameters");
 
    declareProperty("StraightLineMatchAngleCut", m_straightLineMatchAngleCut = 0.1,
                    "Cut on the angular difference between the extrapolated segment angle and reference");
    declareProperty("StraightLineMatchPositionCut", m_straightLineMatchPositionCut = 200.,
                    "Cut on the distance of extrapolated segment position and reference");
    declareProperty("MaxDistanceBetweenSegments", m_maxDistSegments = 5000.,
                    "If the two segments are further apart than this distance, they are considered to not match");
 
    declareProperty("OnlySameSectorIfTight", m_onlySameSectorIfTight = true,
                    "Accept only segments that are in the same sector for tight matching");
    declareProperty("TightSegmentMatching", m_useTightCuts = false,
                    "Use tight selection for busy event to suppress combinatorics and improve CPU");
 
    declareProperty("DoMatchingCutsBIBM_S", m_matchingbibm_sphisec = 0.015,
                    "Cut on sumDeltaYZ, segments in BI and BM, small phi sec");
    declareProperty("DoMatchingCutsBIBO_S", m_matchingbibo_sphisec = 0.015,
                    "Cut on sumDeltaYZ, segments in BI and BO, small phi sec");
    declareProperty("DoMatchingCutsBMBO_S", m_matchingbmbo_sphisec = 0.015,
                    "Cut on sumDeltaYZ, segments in BM and BO, small phi sec");
    declareProperty("DoMatchingCutsEIEM_S", m_matchingeiem_sphisec = 0.010 * 2,
                    "Cut on sumDeltaYZ, segments in EI and EM, small phi sec");
    declareProperty("DoMatchingCutsEIEO_S", m_matchingeieo_sphisec = 0.020 * 2,
                    "Cut on sumDeltaYZ, segments in EI and EO, small phi sec");
    declareProperty("DoMatchingCutsEMEO_S", m_matchingemeo_sphisec = 0.002,
                    "Cut on sumDeltaYZ, segments in EM and EO, small phi sec");
    declareProperty("DoMatchingCutsBIBM_L", m_matchingbibm_lphisec = 0.005,
                    "Cut on sumDeltaYZ, segments in BI and BM, large phi sec");
    declareProperty("DoMatchingCutsBIBO_L", m_matchingbibo_lphisec = 0.015,
                    "Cut on sumDeltaYZ, segments in BI and BO, large phi sec");
    declareProperty("DoMatchingCutsBMBO_L", m_matchingbmbo_lphisec = 0.010,
                    "Cut on sumDeltaYZ, segments in BM and BO, large phi sec");
    declareProperty("DoMatchingCutsEIEM_L", m_matchingeiem_lphisec = 0.015 * 2,
                    "Cut on sumDeltaYZ, segments in EI and EM, large phi sec");
    declareProperty("DoMatchingCutsEIEO_L", m_matchingeieo_lphisec = 0.025 * 2,
                    "Cut on sumDeltaYZ, segments in EI and EO, large phi sec");
    declareProperty("DoMatchingCutsEMEO_L", m_matchingemeo_lphisec = 0.002,
                    "Cut on sumDeltaYZ, segments in EM and EO, large phi sec");
    declareProperty("UseEndcapExtrapolationMatching", m_useEndcapExtrapolationMatching = true);
    declareProperty("DrExtrapolationRMS", m_drExtrapRMS = 10);
    declareProperty("DThetaExtrapolationRMS", m_dthetaExtrapRMS = 0.01 * 2);
    declareProperty("DrExtrapolationAlignementOffset", m_drExtrapAlignmentOffset = 50);
}
 
StatusCode
MuonSegmentMatchingTool::initialize()
{
    ATH_CHECK(AthAlgTool::initialize());
    ATH_CHECK(m_edmHelperSvc.retrieve());
    ATH_CHECK(m_printer.retrieve());
    ATH_CHECK(m_idHelperSvc.retrieve());
    ATH_CHECK(m_pairMatchingTool.retrieve());
    ATH_CHECK(m_overlapResolvingTool.retrieve());
    return StatusCode::SUCCESS;
}
 
StatusCode
MuonSegmentMatchingTool::finalize()
{
    double goodOverlapMatchFraction =
        m_overlapMatches != 0 ? (double)m_overlapMatchesGood / ((double)m_overlapMatches) : 0.;
    ATH_MSG_INFO("Overlap matches:      total " << std::setw(7) << m_overlapMatches << " good " << std::setw(7)
                                                << m_overlapMatchesGood << " fraction " << goodOverlapMatchFraction);
 
    double goodStraightLineMatchFraction =
        m_straightLineMatches != 0 ? (double)m_straightLineMatchesGood / ((double)m_straightLineMatches) : 0.;
    ATH_MSG_INFO("StraightLine matches: total " << std::setw(7) << m_straightLineMatches << " good " << std::setw(7)
                                                << m_straightLineMatchesGood << " fraction "
                                                << goodStraightLineMatchFraction);
 
    double goodCurvedMatchFraction =
        m_curvedMatches != 0 ? (double)m_curvedMatchesGood / ((double)m_curvedMatches) : 0.;
    ATH_MSG_INFO("Curved matches:       total " << std::setw(7) << m_curvedMatches << " good " << std::setw(7)
                                                << m_curvedMatchesGood << " fraction " << goodCurvedMatchFraction);
 
    ATH_MSG_INFO("Segments sharing hits:       total " << std::setw(7) << m_duplicateHitUses);
 
 
    return StatusCode::SUCCESS;
}
bool
MuonSegmentMatchingTool::match(const EventContext& ctx, const MuonSegment& seg1, const MuonSegment& seg2) const {
 
    ATH_MSG_VERBOSE(" match: segments " << std::endl << m_printer->print(seg1) << std::endl << m_printer->print(seg2));
 
    // get identifiers
    Identifier chid1 = m_edmHelperSvc->chamberId(seg1);
    Identifier chid2 = m_edmHelperSvc->chamberId(seg2);
    if (chid1 == chid2) return false;
 
    StIndex stIndex1 = m_idHelperSvc->stationIndex(chid1);
    StIndex stIndex2 = m_idHelperSvc->stationIndex(chid2);
 
    if (isSLMatch(chid1, chid2)) {
        if (!m_idHelperSvc->isMdt(chid1) || !m_idHelperSvc->isMdt(chid2)) return false;
        // if there is a stereo angle match using overlap matching tool
 
        if (stIndex1 == stIndex2) {
 
            if (hasStereoAngle(chid1, chid2)) {
                if (!m_doOverlapMatch) return true;
                const int eta1 = m_idHelperSvc->mdtIdHelper().stationEta(chid1);
                const int eta2 = m_idHelperSvc->mdtIdHelper().stationEta(chid2);
                const int phi1 = m_idHelperSvc->sector(chid1);
                const int phi2 = m_idHelperSvc->sector(chid2);
                // require that the two segments are close in eta AND are in adjecent sectors
                if (  std::abs(eta1-eta2) <=1 
                    && ( std::abs(phi1 - phi2) == 1 || (phi1 == 1 && phi2 == 16)
                        || (phi1 == 16 && phi2 == 1)))
                {
                    return overlapMatch(ctx, seg1, seg2);
                } else
                    return false;
            }
        }
        if (!m_doStraightLineMatch) return true;
 
        if (stIndex1 == stIndex2) return false;
 
        return straightLineMatch(seg1, seg2);
    }
 
    // if we get here perform a curved matching
    if (!m_doCurvedMatch) return true;
    if (stIndex1 == stIndex2) return false;
 
    return curvedMatch(seg1, seg2);
}
 
 
bool
MuonSegmentMatchingTool::straightLineMatch(const MuonSegment& seg1, const MuonSegment& seg2) const
{
    ++m_straightLineMatches;
 
    ATH_MSG_VERBOSE(" straight line match ");
 
    // Suppress cavern background noise and combinatorics using both theta and phi matching
    if (m_thetaMatch)
        if (!suppressNoise(seg1, seg2, m_useTightCuts)) {
            return false;
        }
 
    // Suppress cavern background noise and combinatorics using phi matching
    if (m_phiMatch) {
        if (!suppressNoisePhi(seg1, seg2, m_useTightCuts)) return false;
    }
 
    ++m_straightLineMatchesGood;
    return true;
}
 
bool
MuonSegmentMatchingTool::curvedMatch(const MuonSegment& seg1, const MuonSegment& seg2) const
{
    ++m_curvedMatches;
 
    ATH_MSG_VERBOSE(" curved match ");
 
    // Suppress cavern background noise and combinatorics using both theta and phi matching
    if (m_thetaMatch)
        if (!suppressNoise(seg1, seg2, m_useTightCuts)) {
            return false;
        }
 
    // Suppress cavern background noise and combinatorics using phi matching
    if (m_phiMatch) {
        if (!suppressNoisePhi(seg1, seg2, m_useTightCuts)) return false;
    }
 
    ++m_curvedMatchesGood;
    return true;
}
 
bool
MuonSegmentMatchingTool::overlapMatch(const EventContext& ctx, const MuonSegment& seg1, const MuonSegment& seg2) const
{
    ++m_overlapMatches;
 
    ATH_MSG_VERBOSE(" overlap match ");
 
    Identifier chid = m_edmHelperSvc->chamberId(seg1);
 
    // check the distance between the two segments
    const float segDist = (seg1.globalPosition() - seg2.globalPosition()).mag();
    ATH_MSG_VERBOSE(" Distance between segments " << segDist);
    if (m_isCosmics && segDist > m_minDistSegmentsCosmics) {
        ATH_MSG_DEBUG(" Too far appart, accepting ");
        return true;
    }
    if (segDist > m_maxDistSegments) return false;
   
    if (!m_idHelperSvc->isMdt(chid)) {
        ATH_MSG_DEBUG(" not a mdt segment " << m_idHelperSvc->toString(chid));
        return true;
    }
 
    IMuonSegmentInOverlapResolvingTool::SegmentMatchResult result = m_overlapResolvingTool->matchResult(ctx, seg1, seg2);
 
    ATH_MSG_VERBOSE(result.toString());
 
    if (!result.goodMatch()) {
        ATH_MSG_DEBUG(" bad match ");
        return false;
    }
 
    result.phiResult = m_overlapResolvingTool->bestPhiMatch(seg1, seg2);
    if (std::abs(result.angularDifferencePhi) > m_overlapMatchAngleDPhiCut
        || std::abs(result.phiResult.deltaYZ) > m_overlapMatchAngleDYZCut)
    {
        ATH_MSG_DEBUG(" failed angle cut: diff phi  " << result.angularDifferencePhi << "  deltaYZ "
                                                      << result.phiResult.deltaYZ);
        return false;
    }
 
    if (std::abs(result.averagePhiHitPullSegment1) > m_overlapMatchPhiHitPullCut
        || std::abs(result.averagePhiHitPullSegment2) > m_overlapMatchPhiHitPullCut)
    {
        ATH_MSG_DEBUG(" failed phi hit pull cut: seg1 " << result.averagePhiHitPullSegment1 << "  seg2 "
                                                        << result.averagePhiHitPullSegment2);
        return false;
    }
 
    if (!result.segmentResult1.inBounds(m_overlapMatchPositionCut)
        || !result.segmentResult2.inBounds(m_overlapMatchPositionCut))
    {
        ATH_MSG_DEBUG(" failed position cut ");
        return false;
    }
 
    if (std::abs(result.segmentResult1.positionResidual) > m_overlapMatchPositionResidualCut
        || std::abs(result.segmentResult2.positionResidual) > m_overlapMatchPositionResidualCut)
    {
        ATH_MSG_DEBUG(" failed position residual cut: seg1 " << result.segmentResult1.positionResidual << "  seg2 "
                                                             << result.segmentResult2.positionResidual);
        return false;
    }
 
    ++m_overlapMatchesGood;
    return true;
}
 
bool
MuonSegmentMatchingTool::isSLMatch(const Identifier& chid1, const Identifier& chid2) const
{
 
    // check whether there is field
    if (!m_toroidOn) return true;
 
    StIndex stIndex1 = m_idHelperSvc->stationIndex(chid1);
    StIndex stIndex2 = m_idHelperSvc->stationIndex(chid2);
 
    // check whether segments in same station
    if (stIndex1 == stIndex2) return true;
 
    // check whether segments in endcap EM/EO region
    if ((stIndex1 == StIndex::EO && stIndex2 == StIndex::EM)|| 
        (stIndex1 == StIndex::EM && stIndex2 == StIndex::EO))
        return true;
 
    // all other cases should be treated with curvature
    return false;
}
 
bool
MuonSegmentMatchingTool::hasStereoAngle(const Identifier& id1, const Identifier& id2) const
{
 
    // check whether same phi, else stereo angle (need correction for cosmic up-down tracks)
    int phi1 = m_idHelperSvc->mdtIdHelper().stationPhi(id1);
    int phi2 = m_idHelperSvc->mdtIdHelper().stationPhi(id2);
 
    if (phi1 != phi2) return true;
 
    // check whether there is a small/large overlap
    bool isSmallChamber1 = m_idHelperSvc->isSmallChamber(id1);
    bool isSmallChamber2 = m_idHelperSvc->isSmallChamber(id2);
 
    return isSmallChamber1 != isSmallChamber2;
}
 
 
// DOMINIQUE:
// Check that segment pairs is compatible with being produce within the calorimeter volume
// Keep it loose to retain long live particles decaying in calo
bool
MuonSegmentMatchingTool::suppressNoise(const MuonSegment& seg1, const MuonSegment& seg2, const bool& useTightCuts) const
{
 
    // calculate matching variables
    IMuonSegmentPairMatchingTool::SegmentMatchResult result = m_pairMatchingTool->matchResult(seg1, seg2);
 
    StIndex station_a = m_idHelperSvc->stationIndex(result.chid_a);
    StIndex station_b = m_idHelperSvc->stationIndex(result.chid_b);
 
    bool isEndcap_a = m_idHelperSvc->isEndcap(result.chid_a);
    bool isCSC_a    = m_idHelperSvc->isCsc(result.chid_a);
    bool isBEE_a    = station_a == StIndex::BE;
 
    bool isEndcap_b = m_idHelperSvc->isEndcap(result.chid_b);
    bool isCSC_b    = m_idHelperSvc->isCsc(result.chid_b);
    bool isBEE_b    = station_b == StIndex::BE;
 
 
 
 
    ATH_MSG_VERBOSE("SegmentPositionChange "
                  << " " << m_idHelperSvc->chamberNameString(result.chid_a) << " "
                  << m_idHelperSvc->chamberNameString(result.chid_b) << " " << result.phiSector_a << " "
                  << result.phiSector_b << " " << result.deltaTheta_a << " " << result.deltaTheta_b << " "
                  << result.deltaTheta << " " << result.angleAC << " " << result.angleBC << " " << result.angleAB);
 
 
    ATH_MSG_VERBOSE("matching " << m_idHelperSvc->chamberNameString(result.chid_a) << " "
                                << m_idHelperSvc->chamberNameString(result.chid_b) << " phis " << result.phiSector_a
                                << " " << result.phiSector_b << " thetas " << result.deltaTheta_a << " "
                                << result.deltaTheta_b << " thetaSum " << result.deltaTheta << " tight cuts "
                                << useTightCuts);
 
    // The difference between the segment direction in the inner and outer stations ~< 60 degrees in all cases
    if (result.angleAB > 1.0) return false;
 
 
    // First: loose selection
    if (!useTightCuts) {
        if (isCSC_a || isCSC_b) {
            ATH_MSG_VERBOSE(" check CSC result ");
            if (result.phiSector_a != result.phiSector_b) {
                return false;
            }
            if ((isCSC_a && !isEndcap_b) || (isCSC_b && !isEndcap_a)) return false;
            return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
        }
        // BEE
        else if (isBEE_a || isBEE_b)
        {
            ATH_MSG_VERBOSE(" check BEE result ");
            return result.deltaTheta <= 0.300;
        }
        // Barrel/endcap overlap
        else if (isEndcap_a != isEndcap_b)
        {
            ATH_MSG_VERBOSE(" check B-E result ");
            return result.deltaTheta <= 0.300;
        }
        // Phi-sector overlap
        else if (result.phiSector_a != result.phiSector_b)
        {
            ATH_MSG_VERBOSE(" check phiSector result ");
            if (result.deltaTheta > 0.300) {
                ATH_MSG_VERBOSE(" check phiSector reject ");
                return false;
            } else {
                return true;
            }
        }
        // Barrel inner to middle station
        else if (station_a == StIndex::BI && station_b == StIndex::BM)
        {
            ATH_MSG_VERBOSE(" check BI BM result ");
            if (result.phiSector_a % 2 == 0) {
                return result.deltaTheta <= 6.67 * m_matchingbibm_sphisec;
            } else if (result.phiSector_a % 2 == 1) {
                return result.deltaTheta <= 6.67 * m_matchingbibm_lphisec;
            }
        }
        // Barrel inner to outer station
        else if (station_a == StIndex::BI && station_b == StIndex::BO)
        {
            ATH_MSG_VERBOSE(" check BI BO result ");
            if (result.phiSector_a % 2 == 0) {
                return result.deltaTheta <= 6.67 * m_matchingbibo_sphisec;
            } else if (result.phiSector_a % 2 == 1) {
                return result.deltaTheta <= 6.67 * m_matchingbibo_lphisec;
            }
        }
 
        // Barrel middle to outer station
        else if (station_a == StIndex::BM && station_b == StIndex::BO)
        {
            ATH_MSG_VERBOSE(" check BM BO result ");
            if (result.phiSector_a % 2 == 0) {
                return result.deltaTheta <= 6.67 * m_matchingbmbo_sphisec;
            } else if (result.phiSector_a % 2 == 1) {
                return result.deltaTheta <= 6.67 * m_matchingbmbo_lphisec;
            }
        }
        // Endcap inner to middle station
        else if (station_a == StIndex::EI && (station_b == StIndex::EM))
        {
            ATH_MSG_VERBOSE(" check EI EM result ");
            if (result.phiSector_a % 2 == 0) {
                if (result.deltaTheta > 6.67 * m_matchingeiem_sphisec) {
                    ATH_MSG_VERBOSE(" reject EI EM S result ");
                    return false;
                } else {
                    return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
                }
            } else if (result.phiSector_a % 2 == 1) {
                if (result.deltaTheta > 6.67 * m_matchingeiem_lphisec) {
                    ATH_MSG_VERBOSE(" reject EI EM L result ");
                    return false;
                } else {
                    return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
                }
            }
        }
        // Endcap inner to outer station
        else if (station_a == StIndex::EI && (station_b == StIndex::EO))
        {
            ATH_MSG_VERBOSE(" check EI EO result ");
            if (result.phiSector_a % 2 == 0) {
                if (result.deltaTheta > 6.67 * m_matchingeieo_sphisec) {
                    ATH_MSG_VERBOSE(" reject EI EO S result ");
                    return false;
                } else {
                    return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
                }
            } else if (result.phiSector_a % 2 == 1) {
                if (result.deltaTheta > 6.67 * m_matchingeieo_lphisec) {
                    ATH_MSG_VERBOSE(" reject EI EO L result ");
                    return false;
                } else {
                    return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
                }
            }
        }
        // Endcap middle to outer station
        else if (station_a == StIndex::EM && station_b == StIndex::EO)
        {
            // 5 mrad
            ATH_MSG_VERBOSE(" check EM EO result ");
            if (result.phiSector_a % 2 == 0) {
                return result.deltaTheta <= 6.67 * m_matchingemeo_sphisec;
            } else if (result.phiSector_a % 2 == 1) {
                return result.deltaTheta <= 6.67 * m_matchingemeo_lphisec;
            }
        }
 
        return true;
    }
 
    ATH_MSG_VERBOSE(" check further matching result ");
 
    // Second: tight selection if only if requested
    if (m_onlySameSectorIfTight && result.phiSector_a != result.phiSector_b) {
        ATH_MSG_VERBOSE(" rejection pair as in different sector and using tight cuts");
        return false;
    }
    if (isCSC_a || isCSC_b) {
        if (result.phiSector_a != result.phiSector_b) {
            return false;
        } else {
            if (result.deltaTheta > 0.100) {
                return false;
            } else {
                if ((isCSC_a && !isEndcap_b) || (isCSC_b && !isEndcap_a)) return false;
                return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
            }
        }
 
 
    }
    // BEE
    else if (isBEE_a || isBEE_b)
    {
        return result.deltaTheta <= 0.200;
    }
    // Looser cut for segment in two different phi sectors
    else if (result.phiSector_a != result.phiSector_b)
    {
        return result.deltaTheta <= 0.150;
    }
    // Barrel/endcap overlap
    else if (isEndcap_a != isEndcap_b)
    {
        return result.deltaTheta <= 0.150;
    }
    // Barrel inner to middle station
    else if (station_a == StIndex::BI && station_b == StIndex::BM)
    {
        if (result.phiSector_a % 2 == 0) {
            return result.deltaTheta <= m_matchingbibm_sphisec;
        } else if (result.phiSector_a % 2 == 1) {
            return result.deltaTheta <= m_matchingbibm_lphisec;
        }
    }
    // Barrel inner to outer station
    else if (station_a == StIndex::BI && station_b == StIndex::BO)
    {
        if (result.phiSector_a % 2 == 0) {
            return result.deltaTheta <= m_matchingbibo_sphisec;
        } else if (result.phiSector_a % 2 == 1) {
            return result.deltaTheta <= m_matchingbibo_lphisec;
        }
    }
    // Barrel middle to outer station
    else if (station_a == StIndex::BM && station_b == StIndex::BO)
    {
        if (result.phiSector_a % 2 == 0) {
            return result.deltaTheta <= m_matchingbmbo_sphisec;
        } else if (result.phiSector_a % 2 == 1) {
            return result.deltaTheta <= m_matchingbmbo_lphisec;
        }
    }
    // Endcap inner to middle station
    else if ((station_a == StIndex::EI || station_a == StIndex::BI)
             && station_b == StIndex::EM)
    {
        if (result.phiSector_a % 2 == 0) {
            if (result.deltaTheta > m_matchingeiem_sphisec) {
                return false;
            } else {
                return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
            }
        } else if (result.phiSector_a % 2 == 1) {
            if (result.deltaTheta > m_matchingeiem_lphisec) {
                return false;
            } else {
                return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
            }
        }
    }
    // Endcap inner to outer station
    else if (station_a == StIndex::EI && (station_b == StIndex::EO))
    {
        if (result.phiSector_a % 2 == 0) {
            if (result.deltaTheta > m_matchingeieo_sphisec) {
                return false;
            } else {
                return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
            }
        } else if (result.phiSector_a % 2 == 1) {
            if (result.deltaTheta > m_matchingeieo_lphisec) {
                return false;
            } else {
                return endcapExtrapolationMatch(seg1, seg2, useTightCuts);
            }
        }
    }
    // Endcap middle to outer station
    else if (station_a == StIndex::EM && station_b == StIndex::EO)
    {
        if (result.phiSector_a % 2 == 0) {
            return result.deltaTheta <= m_matchingemeo_sphisec;
        } else if (result.phiSector_a % 2 == 1) {
            return result.deltaTheta <= m_matchingemeo_lphisec;
        }
    }
 
    return true;
}  // if m_useLocalAngles
 
bool
MuonSegmentMatchingTool::suppressNoisePhi(const MuonSegment& seg1, const MuonSegment& seg2,
                                          const bool& useTightCuts) const
{
    // calculate matching variables
    IMuonSegmentPairMatchingTool::SegmentMatchResult result = m_pairMatchingTool->matchResult(seg1, seg2);
 
    StIndex station_a = m_idHelperSvc->stationIndex(result.chid_a);
    StIndex station_b = m_idHelperSvc->stationIndex(result.chid_b);
 
    bool isEndcap_a = m_idHelperSvc->isEndcap(result.chid_a);
 
    bool isEndcap_b = m_idHelperSvc->isEndcap(result.chid_b);
 
 
    ATH_MSG_VERBOSE("SegmentPositionChange Phi"
                  << " " << m_idHelperSvc->chamberNameString(result.chid_a) << " "
                  << m_idHelperSvc->chamberNameString(result.chid_b) << " deltaPhipos " << result.deltaPhipos
                  << " deltaPhidir " << result.deltaPhidir << " phiposerr_a " << result.phiposerr_a << " phiposerr_b "
                  << result.phiposerr_b << " phidirerr_a " << result.phidirerr_a << " phidirerr_b "
                  << result.phidirerr_b << " shorttube_a " << result.shorttube_a << " shorttube_b "
                  << result.shorttube_b);
 
    // Keep segments only if they are in the same or adjacent phi sectors
    if (result.phiSector_a != result.phiSector_b
        && ((result.phiSector_a != 16 && result.phiSector_b != 1)
            && (result.phiSector_a != 1 && result.phiSector_b != 16))
        && (result.phiSector_a != (result.phiSector_b + 1) && result.phiSector_a != (result.phiSector_b - 1)))
        return false;
 
    // First: loose selection
    if (!useTightCuts) {
        // cuts on second coordinate
        if (result.phiSector_a == result.phiSector_b) {
            if (result.phiposerr_a < 10001.000 && result.phiposerr_b < 10001.000) {
 
                if (!isEndcap_a && !isEndcap_b) {
                    return result.deltaPhipos <= 0.1;
                }
                if (isEndcap_a && isEndcap_b) {
                    // small sectors
                    if (result.phiSector_a % 2 == 0) {
                        return result.deltaPhipos <= 0.1;
                    }
                    // large sectors
                    if (result.phiSector_a % 2 == 1) {
                        return result.deltaPhipos <= 0.2;
                    }
                }
            }
        }
 
        if (result.phiSector_a != result.phiSector_b) {
            if (result.phiposerr_a < 10001.000 && result.phiposerr_b < 10001.000) {
                if (!isEndcap_a && !isEndcap_b) {
                    return result.deltaPhipos <= 0.1;
                }
                if (isEndcap_a && isEndcap_b) {
                    return result.deltaPhipos <= 0.2;
                }
            }
         }
 
        // cuts on distance to tube edge
        // only if in a different phi sector
        if (result.phiSector_a != result.phiSector_b) {
            // measured inner segment
            if (result.phiposerr_a < 10001.000) {
                if (station_a == StIndex::BM && station_b == StIndex::BO) {
                    return result.shorttube_a <= 800;
                }
                if (station_a == StIndex::EI && station_b == StIndex::EM) {
                    // MM or STGC have result.shorttube = 99999.
                    return result.shorttube_a <= 3500 || result.shorttube_a == 99999.;
                }
                if (station_a == StIndex::EI && station_b == StIndex::EO) {
                    return result.shorttube_a <= 3500 || result.shorttube_a == 99999.;
                }
                if (station_a == StIndex::EM && station_b == StIndex::EO) {
                    return result.shorttube_a <= 800;
                }
            }
            // measured outer segment
            if (result.phiposerr_b < 10001.000) {
                if (station_a == StIndex::BI && station_b == StIndex::BM) {
                    return result.shorttube_b <= 800;
                }
                if (station_a == StIndex::BI && station_b == StIndex::BO) {
                    return result.shorttube_b <= 800;
                }
                if (station_a == StIndex::BM && station_b == StIndex::BO) {
                    return result.shorttube_b <= 800;
                }
                if (station_a == StIndex::EI && station_b == StIndex::EM) {
                    return result.shorttube_b <= 1400;
                }
            }
        }
        return true;
    }
 
 
    // Second: tight selection if only if requested
    // cuts on second coordinate
    if (result.phiSector_a == result.phiSector_b) {
        if (result.phiposerr_a < 10001.000 && result.phiposerr_b < 10001.000) {
            if (!isEndcap_a && !isEndcap_b) {
                return result.deltaPhipos <= 0.1;
            }
            if (isEndcap_a && isEndcap_b) {
                // small sectors
                if (result.phiSector_a % 2 == 0) {
                    return result.deltaPhipos <= 0.08;
                }
                // large sectors
                if (result.phiSector_a % 2 == 1) {
                    return result.deltaPhipos <= 0.1;
                }
            }
        }
    }
    // cuts on distance to tube edge
    // only if in a different phi sector
    if (result.phiSector_a != result.phiSector_b) {
        if (result.phiposerr_a < 10001.000 && result.phiposerr_b < 10001.000) {
            if (!isEndcap_a && !isEndcap_b) {
                return result.deltaPhipos <= 0.05;
            }
            if (isEndcap_a && isEndcap_b) {
                return result.deltaPhipos <= 0.1;
            }
        }
        
       
        // measured inner segment
        if (result.phiposerr_a < 10001.000) {
            if (station_a == StIndex::BM && station_b == StIndex::BO) {
                return result.shorttube_a <= 600;
            }
            if (station_a == StIndex::EI && station_b == StIndex::EM) {
                return result.shorttube_a <= 3500 || result.shorttube_a == 99999.;
            }
            if (station_a == StIndex::EI && station_b == StIndex::EO) {
                return result.shorttube_a <= 3500 || result.shorttube_a == 99999.;
            }
            if (station_a == StIndex::EM && station_b == StIndex::EO) {
                return result.shorttube_a <= 500;
            }
        }
        // measured outer segment
        if (result.phiposerr_b < 10001.000) {
            if (station_a == StIndex::BI && station_b == StIndex::BM) {
                return result.shorttube_b <= 600;
            }
            if (station_a == StIndex::BI && station_b == StIndex::BO) {
                return result.shorttube_b <= 700;
            }
            if (station_a == StIndex::BM && station_b == StIndex::BO) {
                return result.shorttube_b <= 700;
            }
            if (station_a == StIndex::EI && station_b == StIndex::EM) {
                return result.shorttube_b <= 700;
            }
        }
        
    }
    return true;
}  // if m_useLocalAngles
 
 
bool
MuonSegmentMatchingTool::endcapExtrapolationMatch(const MuonSegment& seg1, const MuonSegment& seg2,
                                                  bool useTightCuts) const
{
 
    if (!m_useEndcapExtrapolationMatching) return true;
 
    Identifier chid1 = m_edmHelperSvc->chamberId(seg1);
    Identifier chid2 = m_edmHelperSvc->chamberId(seg2);
    if (chid1 == chid2) return false;
 
    StIndex stIndex1 = m_idHelperSvc->stationIndex(chid1);
    StIndex stIndex2 = m_idHelperSvc->stationIndex(chid2);
    if (stIndex1 == stIndex2) return false;
 
    const MuonSegment* segInner = nullptr;
    if (stIndex1 == StIndex::EI) segInner = &seg1;
    if (stIndex2 == StIndex::EI) segInner = &seg2;
 
    const MuonSegment* segOuter = nullptr;
    if (stIndex1 == StIndex::EM || stIndex1 == StIndex::EO) segOuter = &seg1;
    if (stIndex2 == StIndex::EM || stIndex2 == StIndex::EO) segOuter = &seg2;
 
    if (!segInner || !segOuter) {
        return false;
    }
    const Amg::Vector3D& pos1 = segOuter->globalPosition();
    const Amg::Vector3D& dir1 = segOuter->globalDirection();
    const Amg::Vector3D& pos2 = segInner->globalPosition();
    const Amg::Vector3D& dir2 = segInner->globalDirection();
 
    // extrapolate the first segment to the inner layer
    double r_expected{0.}, theta_expected{0.}, rhoInv{0.};
    simpleEndcapExtrapolate(pos1.x(), pos1.y(), pos1.z(), dir1.theta(), pos2.z(), r_expected, theta_expected, rhoInv);
 
    if (rhoInv < 0) rhoInv *= -1.;
    double dr     = pos2.perp() - r_expected;
    double dtheta = dir2.theta() - theta_expected;
 
      
    double drCut = m_drExtrapRMS + 5.e6 * rhoInv;
    if (useTightCuts)
        drCut *= 2;
    else
        drCut *= 4;
 
    if ((stIndex1 == StIndex::EM && stIndex2 == StIndex::BI)
        || (stIndex1 == StIndex::BI && stIndex2 == StIndex::EM))
    {
        drCut += 3 * m_drExtrapAlignmentOffset;
    } else {
        drCut += m_drExtrapAlignmentOffset;
    }
 
    double dthetaCut = m_dthetaExtrapRMS + 1.5e3 * rhoInv;
    if (useTightCuts)
        dthetaCut *= 2;
    else
        dthetaCut *= 4;
 
    ATH_MSG_VERBOSE(" simple match " << m_printer->print(seg1) << std::endl
                                     << "              " << m_printer->print(seg2) << std::endl
                                     << " dr " << dr << " cut " << drCut << " dtheta " << dtheta << " cut " << dthetaCut
                                     << " rhoInv " << 1e6 * rhoInv);
 
    if (std::abs(dr) > drCut) return false;
    if (std::abs(dtheta) > dthetaCut) return false;
    return true;
}
 
 
void
MuonSegmentMatchingTool::simpleEndcapExtrapolate(double x_segment, double y_segment, double z_segment,
                                                 double theta_segment, double z_extrapolated, double& r_expected,
                                                 double& theta_expected, double& rhoInv) const
{
    //
    // Endcap extrapolation with a parabolic track model
    //
    //     In the region z = z start - z end of the Toroid one has:
    //        r_expected  = z tan(theta) + (z  - z start)*(z  - z start)/ rho
    //
    //        outside this region No field
    //
    //     here z start = 6 000 z end = 10 000
    //     theta = direction at the vertex rho is the effective curvature
    //
    double z_start = 7000.;
    double z_end   = 12000.;
 
    if (z_extrapolated < 0) z_start = -z_start;
    if (z_extrapolated < 0) z_end = -z_end;
 
    double r_segment = std::hypot(x_segment , y_segment);
 
    if (std::abs(z_extrapolated) > std::abs(z_segment)) {
        ATH_MSG_WARNING(" extrapolate outwards is not implemented for z " << z_extrapolated);
        r_expected     = 0;
        theta_expected = 0.;
        return;
    }
    if (std::abs(z_segment) < std::abs(z_end)) {
        ATH_MSG_WARNING(" segment before end of Toroid: SL extrapolation is used implemented " << z_segment);
    }
 
    // use SL extrapolation to go to the z_end of the Toroid
    const double tan_seg = std::tan(theta_segment);
   
    double r_end = r_segment + (z_end - z_segment) * tan_seg;
 
    double zgeo     = (z_end - z_start) * (z_end - z_start) - 2 * z_end * (z_end - z_start);
    rhoInv          = (r_end - z_end * tan_seg) / zgeo;
    double tantheta = tan_seg - 2 * (z_end - z_start) * rhoInv;
    r_expected      = z_extrapolated * tantheta + (z_extrapolated - z_start) * (z_extrapolated - z_start) * rhoInv;
    //
    // increase radius by 30% wrt straight line
    //
    double r_SL    = r_segment + (z_extrapolated - z_segment) * tan_seg;
    r_expected     = r_expected + 0.3 * (r_expected - r_SL);
    theta_expected = std::atan(tantheta + 2 * (z_extrapolated - z_start) * rhoInv);
 
    if (tan_seg < 0 && theta_expected < 0) theta_expected += M_PI;
    if (tan_seg > 0 && theta_expected < 0) theta_expected = -theta_expected;
}
 
 
}  // namespace Muon