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[PWGCF] add proton selection #16564

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shouqiye merged 1 commit into from
Jun 8, 2026
+122 −2
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[PWGCF] add proton selection #16564

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124 changes: 122 additions & 2 deletions PWGCF/Femto/FemtoNuclei/TableProducer/HadNucleiFemto.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -273,6 +273,7 @@ struct HadNucleiFemto {
// Candidate topology and kinematics
{"hTrackSel", "Accepted hadron tracks", {HistType::kTH1F, {{Selections::kAll, -0.5, static_cast<double>(Selections::kAll) - 0.5}}}},
{"hTrackSelDe", "Accepted deuteron tracks", {HistType::kTH1F, {{Selections::kAll, -0.5, static_cast<double>(Selections::kAll) - 0.5}}}},
{"hDePairFlow", "Deuteron pair-building flow;step;counts", {HistType::kTH1F, {{3, -0.5, 2.5}}}},

{"hdcaxyNu", ";DCA_{xy} (cm)", {HistType::kTH1F, {{200, -1.0f, 1.0f}}}},
{"hdcazNu", ";DCA_{z} (cm)", {HistType::kTH1F, {{200, -1.0f, 1.0f}}}},
Expand Down Expand Up @@ -577,12 +578,45 @@ struct HadNucleiFemto {
template <typename Ttrack>
bool selectTrackHadron(const Ttrack& candidate)
{
if (settingHadPDGCode.value == static_cast<int>(PDG_t::kProton)) {
return selectTrackProton(candidate);
}
if (useReferencePionCuts()) {
return selectTrackPionReference(candidate);
}
return selectTrack(candidate);
}

template <typename Ttrack>
bool selectTrackProton(const Ttrack& candidate)
{
constexpr float protonEtaMax = 0.8f;
constexpr int protonTPCNClsFoundMin = 90;
constexpr int protonTPCCrossedRowsMin = 80;
constexpr float protonDCAzMax = 0.2f;

if (std::abs(candidate.eta()) >= protonEtaMax) {
return false;
}

const float absPt = std::abs(candidate.pt());
if (absPt <= 0.f) {
return false;
}

if (candidate.tpcNClsFound() <= protonTPCNClsFoundMin ||
candidate.tpcNClsCrossedRows() <= protonTPCCrossedRowsMin) {
return false;
}

const float prDCAxyMax = 105.e-3f + 30.5e-3f / std::pow(absPt, 1.1f);
if (std::abs(candidate.dcaXY()) >= prDCAxyMax || std::abs(candidate.dcaZ()) >= protonDCAzMax) {
return false;
}

return true;
}

template <typename Ttrack>
bool selectTrackDe(const Ttrack& candidate)
{
Expand Down Expand Up @@ -690,6 +724,51 @@ struct HadNucleiFemto {
return isRejected;
}

template <typename Ttrack>
bool selectionPIDProton(const Ttrack& candidate)
{
constexpr float protonPtMin = 0.5f;
constexpr float protonPtMax = 3.0f;
constexpr float protonPCombMin = 0.75f;
constexpr float protonTPCNsigmaMax = 3.0f;
constexpr float protonCombNsigmaMax = 3.0f;

const float tpcNSigmaPr = candidate.tpcNSigmaPr();
mQaRegistry.fill(HIST("h2NsigmaHadTPC_preselection"), candidate.sign() * candidate.tpcInnerParam(), tpcNSigmaPr);

if (std::abs(candidate.pt()) <= protonPtMin || std::abs(candidate.pt()) >= protonPtMax) {
return false;
}

const float absPin = std::abs(candidate.tpcInnerParam());
if (absPin < protonPCombMin) {
if (std::abs(tpcNSigmaPr) > protonTPCNsigmaMax) {
return false;
}
mQaRegistry.fill(HIST("h2NsigmaHadTPC"), candidate.sign() * candidate.pt(), tpcNSigmaPr);
mQaRegistry.fill(HIST("h2dEdxHadcandidates"), candidate.sign() * candidate.tpcInnerParam(), candidate.tpcSignal());
return true;
}

if (!candidate.hasTOF()) {
return false;
}

const float tofNSigmaPr = candidate.tofNSigmaPr();
const float combNsigma = std::sqrt(tpcNSigmaPr * tpcNSigmaPr + tofNSigmaPr * tofNSigmaPr);
mQaRegistry.fill(HIST("h2NsigmaHadTOF_preselection"), candidate.sign() * candidate.pt(), tofNSigmaPr);
mQaRegistry.fill(HIST("h2NsigmaHadComb_preselection"), candidate.sign() * candidate.pt(), combNsigma);
if (combNsigma > protonCombNsigmaMax) {
return false;
}

mQaRegistry.fill(HIST("h2NsigmaHadTPC"), candidate.sign() * candidate.pt(), tpcNSigmaPr);
mQaRegistry.fill(HIST("h2NsigmaHadTOF"), candidate.sign() * candidate.pt(), tofNSigmaPr);
mQaRegistry.fill(HIST("h2NsigmaHadComb"), candidate.sign() * candidate.pt(), combNsigma);
mQaRegistry.fill(HIST("h2dEdxHadcandidates"), candidate.sign() * candidate.tpcInnerParam(), candidate.tpcSignal());
return true;
}

template <typename Ttrack>
bool selectionPIDKaon(const Ttrack& candidate)
{
Expand Down Expand Up @@ -840,12 +919,30 @@ struct HadNucleiFemto {
} else if (settingHadPDGCode == PDG_t::kKPlus) {
PID = selectionPIDKaon(candidate);
MassHad = o2::constants::physics::MassKPlus;
} else if (settingHadPDGCode == PDG_t::kProton) {
PID = selectionPIDProton(candidate);
MassHad = o2::constants::physics::MassProton;
} else {
LOG(info) << "invalid PDG code";
}
return PID;
}

template <typename Ttrack>
float getHadronTPCNSigma(const Ttrack& candidate) const
{
if (settingHadPDGCode.value == static_cast<int>(PDG_t::kPiPlus)) {
return candidate.tpcNSigmaPi();
}
if (settingHadPDGCode.value == static_cast<int>(PDG_t::kKPlus)) {
return candidate.tpcNSigmaKa();
}
if (settingHadPDGCode.value == static_cast<int>(PDG_t::kProton)) {
return candidate.tpcNSigmaPr();
}
return -10.f;
}

template <typename Ttrack>
float computeNSigmaDe(const Ttrack& candidate)
{
Expand Down Expand Up @@ -1018,7 +1115,7 @@ struct HadNucleiFemto {

hadNucand.nTPCClustersNu = trackDe.tpcNClsFound();
hadNucand.nSigmaNu = computeNSigmaDe(trackDe);
// hadNucand.nSigmaHad = trackHad.tpcNSigmaPi();
hadNucand.nSigmaHad = getHadronTPCNSigma(trackHad);

hadNucand.chi2TPCNu = trackDe.tpcChi2NCl();
hadNucand.chi2TPCHad = trackHad.tpcChi2NCl();
Expand Down Expand Up @@ -1104,7 +1201,7 @@ struct HadNucleiFemto {
hadHypercand.tpcSignalHad = trackHad.tpcSignal();
hadHypercand.tpcSignalNu = V0Hyper.tpcSignalHe();
hadHypercand.momHadTPC = trackHad.tpcInnerParam();
hadHypercand.nSigmaHad = trackHad.tpcNSigmaPi();
hadHypercand.nSigmaHad = getHadronTPCNSigma(trackHad);
hadHypercand.nSigmaNu = V0Hyper.nSigmaHe();
hadHypercand.chi2TPCHad = trackHad.tpcChi2NCl();
hadHypercand.chi2TPCNu = V0Hyper.tpcChi2He();
Expand Down Expand Up @@ -1146,6 +1243,10 @@ struct HadNucleiFemto {
mQaRegistry.fill(HIST("hTrackSel"), Selections::kPID);
mQaRegistry.fill(HIST("hSingleNuPt"), track0.pt() * track0.sign());
mQaRegistry.fill(HIST("hSingleNuPin"), track0.tpcInnerParam() * track0.sign());
mQaRegistry.fill(HIST("hDePairFlow"), 0);

bool hasHadronSelected = false;
bool hasStoredPair = false;

for (const auto& track1 : tracks) {
if (track0 == track1) {
Expand All @@ -1164,6 +1265,7 @@ struct HadNucleiFemto {
if (!selectTrackHadron(track1) || !selectionPIDHadron(track1)) {
continue;
}
hasHadronSelected = true;
if (isClosePair(track0, track1)) {
continue;
}
Expand All @@ -1175,6 +1277,14 @@ struct HadNucleiFemto {
CollBracket collBracket{collIdx, collIdx};
trackPair.collBracket = collBracket;
mTrackPairs.push_back(trackPair);
hasStoredPair = true;
}

if (hasHadronSelected) {
mQaRegistry.fill(HIST("hDePairFlow"), 1);
}
if (hasStoredPair) {
mQaRegistry.fill(HIST("hDePairFlow"), 2);
}
}
}
Expand Down Expand Up @@ -1628,6 +1738,16 @@ PROCESS_SWITCH(HadNucleiFemto, processMixedEventHyper, "Process Mixed event", fa
mQaRegistry.fill(HIST("purity/h2NsigmaHadTOF_preselection"), track.sign() * track.pt(), tofNSigmaHad);
mQaRegistry.fill(HIST("purity/h2NsigmaHadComb_preselection"), track.sign() * track.pt(), combNsigmaHad);
}
} else if (passTrackHad && settingHadPDGCode == PDG_t::kProton) {
constexpr float protonPCombMin = 0.75f;
const float tpcNSigmaHad = track.tpcNSigmaPr();
mQaRegistry.fill(HIST("purity/h2NsigmaHadTPC_preselection"), track.sign() * track.pt(), tpcNSigmaHad);
if (track.hasTOF() && std::abs(track.tpcInnerParam()) >= protonPCombMin) {
const float tofNSigmaHad = track.tofNSigmaPr();
const float combNsigmaHad = std::sqrt(tofNSigmaHad * tofNSigmaHad + tpcNSigmaHad * tpcNSigmaHad);
mQaRegistry.fill(HIST("purity/h2NsigmaHadTOF_preselection"), track.sign() * track.pt(), tofNSigmaHad);
mQaRegistry.fill(HIST("purity/h2NsigmaHadComb_preselection"), track.sign() * track.pt(), combNsigmaHad);
}
}

if (passTrackDe) {
Expand Down
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