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[PWGDQ] fixes to the dimuon processing in the global alignment task #18012

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[PWGDQ] fixes to the dimuon processing in the global alignment task #18012

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40 changes: 32 additions & 8 deletions PWGDQ/Tasks/muonGlobalAlignment.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -2223,13 +2223,31 @@ struct MuonGlobalAlignment { // o2-linter: disable=name/workflow-file,name/struc
c.posX(), c.posY(), c.posZ(),
c.covXX(), c.covYY(), c.covZZ());

bool hasOppositeSignMuonPair = false;
std::vector<MuonPair> muonPairs;
getMuonPairs(collisionInfo, muonPairs);
for (auto [mchIndex1, mchIndex2] : muonPairs) {

int sign1 = muonTracks.rawIteratorAt(mchIndex1).sign();
int sign2 = muonTracks.rawIteratorAt(mchIndex2).sign();

// only consider opposite-sign pairs
if ((sign1 * sign2) < 0) {
hasOppositeSignMuonPair = true;
break;
}
}

// loop over MCH tracks
for (const auto& mchIndex : collisionInfo.mchTracks) {
auto const& mchTrack = muonTracks.rawIteratorAt(mchIndex);

// only store good MCH tracks
if (!IsGoodMuon(mchTrack, c, cfgTrackChi2MchUp, 0.f, cfgPtMchLow, {cfgEtaMftLow, cfgEtaMftUp}, {cfgRabsLow, cfgRabsUp}, fSigmaPdcaUp)) {
continue;
// store all MCH tracks when the event contains a muon pair of opposite sign
if (!hasOppositeSignMuonPair) {
// only store good MCH tracks
if (!IsGoodMuon(mchTrack, c, cfgTrackChi2MchUp, 0.f, cfgPtMchLow, {cfgEtaMftLow, cfgEtaMftUp}, {cfgRabsLow, cfgRabsUp}, fSigmaPdcaUp)) {
continue;
}
}

fwdTable(collId,
Expand Down Expand Up @@ -2809,18 +2827,24 @@ struct MuonGlobalAlignment { // o2-linter: disable=name/workflow-file,name/struc
std::vector<MuonPair> muonPairs;
getMuonPairs(collisionInfo, muonPairs);

for (const auto& [mchIndex1, mchIndex2] : muonPairs) {
for (auto [mchIndex1, mchIndex2] : muonPairs) { // o2-linter: disable=const-ref-in-for-loop (values are modified in loop)

auto const& muonTrack1 = muonTracks.rawIteratorAt(mchIndex1);
auto const& muonTrack2 = muonTracks.rawIteratorAt(mchIndex2);
int sign1 = muonTrack1.sign();
int sign2 = muonTrack2.sign();
int sign1 = muonTracks.rawIteratorAt(mchIndex1).sign();
int sign2 = muonTracks.rawIteratorAt(mchIndex2).sign();

// only consider opposite-sign pairs
if ((sign1 * sign2) >= 0) {
continue;
}

// make sure that index #1 corresponds to the positive track
if (sign1 < 0) {
std::swap(mchIndex1, mchIndex2);
}

auto const& muonTrack1 = muonTracks.rawIteratorAt(mchIndex1);
auto const& muonTrack2 = muonTracks.rawIteratorAt(mchIndex2);

bool isGoodMuon1 = IsGoodMuon(muonTrack1, collision, cfgTrackChi2MchUp, 0.f, cfgPtMchLow, {cfgEtaMchLow, cfgEtaMchUp}, {cfgRabsLow, cfgRabsUp}, fSigmaPdcaUp);
bool isGoodMuon2 = IsGoodMuon(muonTrack2, collision, cfgTrackChi2MchUp, 0.f, cfgPtMchLow, {cfgEtaMchLow, cfgEtaMchUp}, {cfgRabsLow, cfgRabsUp}, fSigmaPdcaUp);
bool goodMuonTracks = (isGoodMuon1 && isGoodMuon2);
Expand Down
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