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[Trigger,PWGHF] Add mass vs ct histogram also for Xic0 #16226

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fgrosa merged 2 commits into from
May 12, 2026
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[Trigger,PWGHF] Add mass vs ct histogram also for Xic0 #16226

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a0ed5b9
Add mass vs ct histogram also for Xic0
fgrosa May 12, 2026
ad42e07
Fixy typo
fgrosa May 12, 2026
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14 changes: 8 additions & 6 deletions EventFiltering/PWGHF/HFFilter.cxx
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright 2019-2020 CERN and copyright holders of ALICE O2.

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[name/workflow-file] 

Name of a workflow file must match the name of the main struct in it (without the PWG prefix). (Class implementation files should be in "Core" directories.)
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
Expand Down Expand Up @@ -153,7 +153,7 @@
} enableWrongMassHyp;

// parameters for Sigma_C proton trigger
Configurable<LabeledArray<float>> cutsSigmaCPr{

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[name/configurable] 

Use lowerCamelCase for names of configurables and use the same name for the struct member as for the JSON string. (Declare the type and names on the same line.)
"cutsSigmaCPr",
{cutsSigmaCPrDefault[0],
static_cast<uint32_t>(labelsRowsSigmaCPr.size()),
Expand Down Expand Up @@ -184,7 +184,7 @@
Configurable<bool> acceptBdtBkgOnly{"acceptBdtBkgOnly", true, "Enable / disable selection based on BDT bkg score only"};

// CCDB configuration
Configurable<std::string> url{"ccdb-url", "http://alice-ccdb.cern.ch", "url of the ccdb repository"};

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[name/configurable] 

Use lowerCamelCase for names of configurables and use the same name for the struct member as for the JSON string. (Declare the type and names on the same line.)

// TPC PID calibrations
Configurable<int> setTPCCalib{"setTPCCalib", 0, "0 is not use re-calibrations, 1 is compute TPC post-calibrated n-sigmas, 2 is using TPC Spline"};
Expand Down Expand Up @@ -249,7 +249,8 @@
std::array<std::shared_ptr<TH1>, kNCharmParticles> hBDTScorePrompt{};
std::array<std::shared_ptr<TH1>, kNCharmParticles> hBDTScoreNonPrompt{};
std::array<std::shared_ptr<TH2>, kNV0> hArmPod{};
std::shared_ptr<TH2> hV0Selected, hMassVsCtCharmBaryonToXiPiPi;
std::shared_ptr<TH2> hV0Selected;
std::array<std::shared_ptr<TH2>, 2> hMassVsCtCharmBaryonToXi{};
std::array<std::shared_ptr<TH2>, 2> hMassXi{}; // not tracked and tracked
std::array<std::shared_ptr<TH2>, kNBeautyParticles> hCpaVsPtB{};
std::array<std::shared_ptr<TH2>, kNBeautyParticles> hDecayLengthVsPtB{};
Expand Down Expand Up @@ -348,7 +349,7 @@

hProcessedEvents = registry.add<TH1>("fProcessedEvents", "HF - event filtered;;counts", HistType::kTH1D, {{kNtriggersHF + 2, -0.5, +kNtriggersHF + 1.5}});
for (auto iBin = 0; iBin < kNtriggersHF + 2; ++iBin) {
if (iBin < 2)

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
hProcessedEvents->GetXaxis()->SetBinLabel(iBin + 1, eventTitles[iBin].data());
else
hProcessedEvents->GetXaxis()->SetBinLabel(iBin + 1, hfTriggerNames[iBin - 2].data());
Expand Down Expand Up @@ -390,7 +391,8 @@
hMassVsPtC[kNCharmParticles + 15] = registry.add<TH2>("fMassVsPtCharmBaryonToXiPi", "#it{M} vs. #it{p}_{T} distribution of triggered #Xi+#pi candidates;#it{p}_{T} (GeV/#it{c});#it{M} (GeV/#it{c}^{2});counts", HistType::kTH2D, {ptAxis, massAxisC[kNCharmParticles + 15]});
hMassVsPtC[kNCharmParticles + 16] = registry.add<TH2>("fMassVsPtCharmBaryonToXiKa", "#it{M} vs. #it{p}_{T} distribution of triggered #Xi+K candidates;#it{p}_{T} (GeV/#it{c});#it{M} (GeV/#it{c}^{2});counts", HistType::kTH2D, {ptAxis, massAxisC[kNCharmParticles + 16]});
hMassVsPtC[kNCharmParticles + 17] = registry.add<TH2>("fMassVsPtCharmBaryonToXiPiPi", "#it{M} vs. #it{p}_{T} distribution of triggered #Xi+#pi+#pi candidates;#it{p}_{T} (GeV/#it{c});#it{M} (GeV/#it{c}^{2});counts", HistType::kTH2D, {ptAxis, massAxisC[kNCharmParticles + 17]});
hMassVsCtCharmBaryonToXiPiPi = registry.add<TH2>("fMassVsCtCharmBaryonToXiPiPi", "#it{M} vs. ct distribution of triggered #Xi+#pi+#pi candidates;ct (cm);#it{M} (GeV/#it{c}^{2});counts", HistType::kTH2D, {ctAxis, massAxisC[kNCharmParticles + 17]});
hMassVsCtCharmBaryonToXi[0] = registry.add<TH2>("fMassVsCtCharmBaryonToXiPi", "#it{M} vs. ct distribution of triggered #Xi+#pi candidates;ct (cm);#it{M} (GeV/#it{c}^{2});counts", HistType::kTH2D, {ctAxis, massAxisC[kNCharmParticles + 15]});
hMassVsCtCharmBaryonToXi[1] = registry.add<TH2>("fMassVsCtCharmBaryonToXiPiPi", "#it{M} vs. ct distribution of triggered #Xi+#pi+#pi candidates;ct (cm);#it{M} (GeV/#it{c}^{2});counts", HistType::kTH2D, {ctAxis, massAxisC[kNCharmParticles + 17]});
// JPsi
hMassVsPtC[kNCharmParticles + 18] = registry.add<TH2>("fMassVsPtJPsiToMuMu", "#it{M} vs. #it{p}_{T} distribution of triggered J/#psi to #mu#mu candidates;#it{p}_{T} (GeV/#it{c});#it{M} (GeV/#it{c}^{2});counts", HistType::kTH2D, {ptAxis, massAxisC[kNCharmParticles + 18]});
// Lc resonances
Expand Down Expand Up @@ -571,7 +573,7 @@
std::vector<float> scores{};
if (preselD0) {
scores.insert(scores.end(), cand2Prong.mlProbSkimD0ToKPi().begin(), cand2Prong.mlProbSkimD0ToKPi().end());
if (scores.size() != 3) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
scores.resize(3);
scores[0] = 2.;
scores[1] = -1.;
Expand Down Expand Up @@ -1343,7 +1345,7 @@
continue;
}

if (scores[iCharmPart].size() != 3) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
scores[iCharmPart].resize(3);
scores[iCharmPart][0] = 2.;
scores[iCharmPart][1] = -1.;
Expand Down Expand Up @@ -1610,7 +1612,7 @@
/// - it has the correct charge (±1)
/// - it is in the correct mass range
// check the charge for SigmaC++K- candidates
if (!keepEvent[kSigmaCPPK] && (std::abs(chargeSc + track.sign()) == 1 && std::abs(chargeSc) == 2)) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
// check the invariant mass
float massSigmaCPKPi{-999.}, massSigmaCPiKP{-999.}, deltaMassXicResoPKPi{-999.}, deltaMassXicResoPiKP{-999.};
float ptSigmaCKaon = RecoDecay::pt(pVecSigmaC, pVecFourth);
Expand Down Expand Up @@ -1912,7 +1914,7 @@
std::array<float, 2> dcaInfo;
o2::track::TrackParCov trackParCasc;
o2::track::TrackParCov trackParCascTrack;
if (requireStrangenessTrackingAny < 2) { // needed for at least one of the two

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
trackParCasc = o2::track::TrackParCov(cascCand.vtx, cascCand.mom, cascCand.cov, cascCand.sign, true);
trackParCasc.setPID(o2::track::PID::XiMinus);
trackParCasc.setAbsCharge(1); // to be sure
Expand Down Expand Up @@ -1949,10 +1951,10 @@
bool isSelXiBach{false};
if (requireStrangenessTracking->get(0u, 0u) > 0) {
if (hasStrangeTrack) {
isSelXiBach = helper.isSelectedXiBach(trackParCascTrack, trackParBachelor, isSelBachelor, collision, dfStrangeness, activateQA, hMassVsPtC[kNCharmParticles + 15], hMassVsPtC[kNCharmParticles + 16]);
isSelXiBach = helper.isSelectedXiBach(trackParCascTrack, trackParBachelor, isSelBachelor, collision, dfStrangeness, activateQA, hMassVsPtC[kNCharmParticles + 15], hMassVsPtC[kNCharmParticles + 16], hMassVsCtCharmBaryonToXi[0]);
}
} else {
isSelXiBach = helper.isSelectedXiBach(trackParCasc, trackParBachelor, isSelBachelor, collision, dfStrangeness, activateQA, hMassVsPtC[kNCharmParticles + 15], hMassVsPtC[kNCharmParticles + 16]);
isSelXiBach = helper.isSelectedXiBach(trackParCasc, trackParBachelor, isSelBachelor, collision, dfStrangeness, activateQA, hMassVsPtC[kNCharmParticles + 15], hMassVsPtC[kNCharmParticles + 16], hMassVsCtCharmBaryonToXi[0]);
}
if (isSelXiBach) {
keepEvent[kCharmBarToXiBach] = true;
Expand Down Expand Up @@ -1992,10 +1994,10 @@
bool isSelXiBachBach{false};
if (requireStrangenessTracking->get(0u, 1u) > 0) {
if (hasStrangeTrack) {
isSelXiBachBach = helper.isSelectedXiBachBach<3>(trackParCascTrack, {trackParBachelor, trackParBachelorSecond}, collision, dfStrangeness3, activateQA, hMassVsPtC[kNCharmParticles + 17], hMassVsCtCharmBaryonToXiPiPi);
isSelXiBachBach = helper.isSelectedXiBachBach<3>(trackParCascTrack, {trackParBachelor, trackParBachelorSecond}, collision, dfStrangeness3, activateQA, hMassVsPtC[kNCharmParticles + 17], hMassVsCtCharmBaryonToXi[1]);
}
} else { // vertex with only the two bachelors
isSelXiBachBach = helper.isSelectedXiBachBach<2>(trackParCasc, {trackParBachelor, trackParBachelorSecond}, collision, df2, activateQA, hMassVsPtC[kNCharmParticles + 17], hMassVsCtCharmBaryonToXiPiPi);
isSelXiBachBach = helper.isSelectedXiBachBach<2>(trackParCasc, {trackParBachelor, trackParBachelorSecond}, collision, df2, activateQA, hMassVsPtC[kNCharmParticles + 17], hMassVsCtCharmBaryonToXi[1]);
}
if (isSelXiBachBach) {
keepEvent[kCharmBarToXi2Bach] = true;
Expand Down
11 changes: 8 additions & 3 deletions EventFiltering/PWGHF/HFFilterHelpers.h
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Expand Up @@ -274,6 +274,7 @@
constexpr float massDs = o2::constants::physics::MassDS;
constexpr float massLc = o2::constants::physics::MassLambdaCPlus;
constexpr float massXic = o2::constants::physics::MassXiCPlus;
constexpr float massXic0 = o2::constants::physics::MassXiC0;
constexpr float massDStar = o2::constants::physics::MassDStar;
constexpr float massBPlus = o2::constants::physics::MassBPlus;
constexpr float massB0 = o2::constants::physics::MassB0;
Expand All @@ -296,7 +297,7 @@
static const o2::framework::AxisSpec qtAxis{100, 0.f, 0.25f};
static const o2::framework::AxisSpec bdtAxis{100, 0.f, 1.f};
static const o2::framework::AxisSpec phiAxis{36, 0., o2::constants::math::TwoPI};
static const std::array<o2::framework::AxisSpec, kNCharmParticles + 24> massAxisC = {o2::framework::AxisSpec{250, 1.65f, 2.15f}, o2::framework::AxisSpec{250, 1.65f, 2.15f}, o2::framework::AxisSpec{250, 1.75f, 2.25f}, o2::framework::AxisSpec{250, 2.05f, 2.55f}, o2::framework::AxisSpec{250, 2.25f, 2.75f}, o2::framework::AxisSpec{200, 0.139f, 0.159f}, o2::framework::AxisSpec{250, 0.f, 0.25f}, o2::framework::AxisSpec{250, 0.f, 0.25f}, o2::framework::AxisSpec{200, 0.48f, 0.88f}, o2::framework::AxisSpec{200, 0.48f, 0.88f}, o2::framework::AxisSpec{200, 1.1f, 1.4f}, o2::framework::AxisSpec{200, 1.1f, 1.4f}, o2::framework::AxisSpec{200, 1.1f, 1.4f}, o2::framework::AxisSpec{200, 1.1f, 1.4f}, o2::framework::AxisSpec{170, 0.13f, 0.3f}, o2::framework::AxisSpec{170, 0.13f, 0.3f}, o2::framework::AxisSpec{200, 0.4f, 0.8f}, o2::framework::AxisSpec{200, 0.4f, 0.8f}, o2::framework::AxisSpec{200, 0.4f, 0.8f}, o2::framework::AxisSpec{200, 0.4f, 0.8f}, o2::framework::AxisSpec{350, 2.3f, 3.0f}, o2::framework::AxisSpec{350, 2.3f, 3.0f}, o2::framework::AxisSpec{350, 2.3f, 3.0f}, o2::framework::AxisSpec{240, 2.4f, 3.6f}, o2::framework::AxisSpec{300, 0.7f, 1.3f}, o2::framework::AxisSpec{300, 0.7f, 1.3f}, o2::framework::AxisSpec{300, 0.7f, 1.3f}, o2::framework::AxisSpec{300, 0.7f, 1.3f}, o2::framework::AxisSpec{300, 0.14f, 0.26f}};

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[pdg/explicit-mass] 

Avoid hard-coded particle masses. Use o2::constants::physics::Mass... instead.
static const std::array<o2::framework::AxisSpec, nTotBeautyParts> massAxisB = {o2::framework::AxisSpec{500, 4.2f, 6.2f}, o2::framework::AxisSpec{500, 4.2f, 6.2f}, o2::framework::AxisSpec{500, 5.4f, 7.4f}, o2::framework::AxisSpec{500, 4.2f, 6.2f}, o2::framework::AxisSpec{500, 4.4f, 6.4f}, o2::framework::AxisSpec{400, 5.0f, 6.6f}, o2::framework::AxisSpec{500, 4.2f, 6.2f}, o2::framework::AxisSpec{500, 4.2f, 6.2f}, o2::framework::AxisSpec{500, 4.2f, 6.2f}, o2::framework::AxisSpec{500, 4.2f, 6.2f}, o2::framework::AxisSpec{400, 5.0f, 6.6f}, o2::framework::AxisSpec{240, 5.8f, 7.0f}};

// default values for configurables
Expand Down Expand Up @@ -717,7 +718,7 @@
template <typename T1>
bool isCharmHadronMassInSbRegions(T1 const& massHypo1, T1 const& massHypo2, const float& lowLimitSB, const float& upLimitSB);
template <typename T, typename C, typename H2>
bool isSelectedXiBach(T const& trackParCasc, T const& trackParBachelor, int8_t isSelBachelor, C const& collision, o2::vertexing::DCAFitterN<2>& dcaFitter, const int& activateQA, H2 hMassVsPtXiPi, H2 hMassVsPtXiKa);
bool isSelectedXiBach(T const& trackParCasc, T const& trackParBachelor, int8_t isSelBachelor, C const& collision, o2::vertexing::DCAFitterN<2>& dcaFitter, const int& activateQA, H2 hMassVsPtXiPi, H2 hMassVsPtXiKa, H2 hMassVsCtXiPi);
template <int Nprongs, typename T, typename C, typename H2>
bool isSelectedXiBachBach(T const& trackParCasc, std::array<T, 2> const& trackParBachelor, C const& collision, o2::vertexing::DCAFitterN<Nprongs>& dcaFitter, const int& activateQA, H2 hMassVsPtXiPiPi, H2 hMassVsCtXiPiPi);
template <bool is4ThetaC = false, typename T>
Expand Down Expand Up @@ -919,7 +920,7 @@
return kRejected;
}

if (std::fabs(trackPar.getEta()) > 0.8) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
return kRejected;
}

Expand Down Expand Up @@ -2423,8 +2424,9 @@
/// \param activateQA is the flag to activate the QA
/// \param hMassVsPtXiPi is the 2D histogram with pT vs mass(XiPi)
/// \param hMassVsPtXiKa is the 2D histogram with pT vs mass(XiKa)
/// \param hMassVsCtXiPi is the 2D histogram with ct vs mass(XiPi)
template <typename T, typename C, typename H2>
inline bool HfFilterHelper::isSelectedXiBach(T const& trackParCasc, T const& trackParBachelor, int8_t isSelBachelor, C const& collision, o2::vertexing::DCAFitterN<2>& dcaFitter, const int& activateQA, H2 hMassVsPtXiPi, H2 hMassVsPtXiKa)
inline bool HfFilterHelper::isSelectedXiBach(T const& trackParCasc, T const& trackParBachelor, int8_t isSelBachelor, C const& collision, o2::vertexing::DCAFitterN<2>& dcaFitter, const int& activateQA, H2 hMassVsPtXiPi, H2 hMassVsPtXiKa, H2 hMassVsCtXiPi)
{
bool isSelectedXiPi{false}, isSelectedXiKa{false};

Expand Down Expand Up @@ -2483,13 +2485,16 @@
return false;
}

if (RecoDecay::distance(primVtx, vtx) < mDecLenMinXiBach[0]) {
auto decLenXiBach = RecoDecay::distance(primVtx, vtx);
if (decLenXiBach < mDecLenMinXiBach[0]) {
return false;
}

if (activateQA) {
if (isSelectedXiPi) {
auto ctXiBach = RecoDecay::ct(momXiBach, decLenXiBach, massXic0);
hMassVsPtXiPi->Fill(ptXiBach, massXiPi);
hMassVsCtXiPi->Fill(ctXiBach, massXiPi);
}
if (isSelectedXiKa) {
hMassVsPtXiKa->Fill(ptXiBach, massXiKa);
Expand Down
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