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maciacco merged 1 commit into from
Nov 21, 2025
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[PWGLF] Improvement in Kink vertex finder #13921

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143 changes: 94 additions & 49 deletions PWGLF/Tasks/Nuspex/spectraKinkPiKa.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,7 @@ using CollisionsFull = soa::Join<aod::Collisions, aod::EvSel, aod::FT0Mults, aod
using CollisionsFullMC = soa::Join<aod::Collisions, aod::McCollisionLabels, aod::EvSel, aod::CentFT0Ms, aod::CentFT0As, aod::CentFT0Cs, aod::CentFV0As>;
namespace
{
constexpr std::array<float, 7> LayerRadii{2.33959f, 3.14076f, 3.91924f, 19.6213f, 24.5597f, 34.388f, 39.3329f};
// constexpr std::array<float, 7> LayerRadii{2.33959f, 3.14076f, 3.91924f, 19.6213f, 24.5597f, 34.388f, 39.3329f};
constexpr double BetheBlochDefault[1][6]{{-1.e32, -1.e32, -1.e32, -1.e32, -1.e32, -1.e32}};
static const std::vector<std::string> betheBlochParNames{"p0", "p1", "p2", "p3", "p4", "resolution"};
static const std::vector<std::string> particleNames{"Daughter"};
Expand Down Expand Up @@ -96,7 +96,7 @@ struct KinkBuilder {
Service<o2::ccdb::BasicCCDBManager> ccdb;
// Selection criteria
Configurable<float> maxDCAMothToPV{"maxDCAMothToPV", 0.2, "Max DCA of the mother to the PV"};
Configurable<float> minDCADaugToPV{"minDCADaugToPV", 0., "Min DCA of the daughter to the PV"};
Configurable<float> minDCADaugToPV{"minDCADaugToPV", 0.1, "Min DCA of the daughter to the PV"};
Configurable<float> minPtMoth{"minPtMoth", 0.15, "Minimum pT of the hypercandidate"};
Configurable<float> maxZDiff{"maxZDiff", 20., "Max z difference between the kink daughter and the mother"};
Configurable<float> maxPhiDiff{"maxPhiDiff", 100, "Max phi difference between the kink daughter and the mother"};
Expand All @@ -107,6 +107,10 @@ struct KinkBuilder {
Configurable<float> itsChi2cut{"itsChi2cut", 36, "mother itsChi2 cut"};
Configurable<bool> askTOFforDaug{"askTOFforDaug", false, "If true, ask for TOF signal"};
Configurable<bool> kaontopologhy{"kaontopologhy", true, "If true, selected mother have both ITS+TPC "};
Configurable<bool> vertexfinding{"vertexfinding", false, "If true, find the vextex in TPC and applied cut of z and phi"};
Configurable<float> rMin{"rMin", 120., "min radius for kink vertex"};
Configurable<float> rMax{"rMax", 200., "max radius for kink vertex"};
Configurable<float> rStep{"rStep", 2., "step size for scan radius in tpc"};

o2::vertexing::DCAFitterN<2> fitter;
o2::base::MatLayerCylSet* lut = nullptr;
Expand Down Expand Up @@ -214,10 +218,15 @@ struct KinkBuilder {
svCreator.fillBC2Coll(collisions, bcs);
for (const auto& track : tracks) {
bool isDaug = selectDaugTrack(track);

bool isMoth = selectMothTrack(track);

if (!isDaug && !isMoth)
continue;
if (isDaug && track.isPVContributor())
continue;
if (isMoth && !track.isPVContributor())
continue;
if (isDaug && std::abs(track.eta()) > etaMaxDaug)
continue;
if (isMoth && std::abs(track.eta()) > etaMaxMoth)
Expand Down Expand Up @@ -245,25 +254,65 @@ struct KinkBuilder {

o2::track::TrackParCov trackParCovMoth = getTrackParCov(trackMoth);
o2::track::TrackParCov trackParCovMothPV{trackParCovMoth};
o2::base::Propagator::Instance()->PropagateToXBxByBz(trackParCovMoth, LayerRadii[trackMoth.itsNCls() - 1]);
std::array<float, 2> dcaInfoMoth;
o2::base::Propagator::Instance()->propagateToDCABxByBz({primaryVertex.getX(), primaryVertex.getY(), primaryVertex.getZ()}, trackParCovMothPV, 2.f, static_cast<o2::base::Propagator::MatCorrType>(cfgMaterialCorrection.value), &dcaInfoMoth);

o2::track::TrackParCov trackParCovDaug = getTrackParCov(trackDaug);
// propagate to PV
std::array<float, 2> dcaInfoDaug;
o2::base::Propagator::Instance()->propagateToDCABxByBz({primaryVertex.getX(), primaryVertex.getY(), primaryVertex.getZ()}, trackParCovDaug, 2.f, static_cast<o2::base::Propagator::MatCorrType>(cfgMaterialCorrection.value), &dcaInfoDaug);

// check if the kink daughter is close to the mother
if (std::abs(trackParCovMoth.getZ() - trackParCovDaug.getZ()) > maxZDiff) {
if (std::abs(dcaInfoMoth[1]) > maxDCAMothToPV) {
continue;
}
if ((std::abs(trackParCovMoth.getPhi() - trackParCovDaug.getPhi()) * radToDeg) > maxPhiDiff) {
if (std::abs(dcaInfoDaug[1]) < minDCADaugToPV) {
continue;
}
// propagate to PV
std::array<float, 2> dcaInfoDaug;
o2::base::Propagator::Instance()->propagateToDCABxByBz({primaryVertex.getX(), primaryVertex.getY(), primaryVertex.getZ()}, trackParCovDaug, 2.f, static_cast<o2::base::Propagator::MatCorrType>(cfgMaterialCorrection.value), &dcaInfoDaug);
if (std::abs(dcaInfoDaug[0]) < minDCADaugToPV) {

if (vertexfinding) {
float bestR = -1;
float bestDeltaPhi = 999;
float bestDeltaZ = 999;
float bestCost = 1e12;
// make local copies (don’t modify originals)
auto mothTmp0 = trackParCovMoth;
auto daugTmp0 = trackParCovDaug;
const float minr = rMin;
const float maxr = rMax;
const float rs = rStep;
for (float R = minr; R <= maxr; R += rs) {
auto mothTmp = mothTmp0;
auto daugTmp = daugTmp0;
if (!o2::base::Propagator::Instance()->PropagateToXBxByBz(mothTmp, R))
continue;
if (!o2::base::Propagator::Instance()->PropagateToXBxByBz(daugTmp, R))
continue;
float dphi = std::abs(mothTmp.getPhi() - daugTmp.getPhi());
if (dphi > M_PI)
dphi = 2 * M_PI - dphi; // wrap φ
float dz = std::abs(mothTmp.getZ() - daugTmp.getZ());
float cost = dphi * dphi + dz * dz; // <-- correct metric
if (cost < bestCost) {
bestCost = cost;
bestDeltaPhi = dphi;
bestDeltaZ = dz;
bestR = R;
}
}
if (bestR < 0)
continue;
if (bestDeltaZ > maxZDiff)
continue;
if (bestDeltaPhi * radToDeg > maxPhiDiff)
continue;
}
/* // check if the kink daughter is close to the mother
if (std::abs(trackParCovMoth.getZ() - trackParCovDaug.getZ()) > maxZDiff) {
continue;
}
if ((std::abs(trackParCovMoth.getPhi() - trackParCovDaug.getPhi()) * radToDeg) > maxPhiDiff) {
continue;
}
*/
int nCand = 0;
try {
nCand = fitter.process(trackParCovMoth, trackParCovDaug);
Expand Down Expand Up @@ -367,7 +416,7 @@ struct SpectraKinkPiKa {
Configurable<float> tpcChi2Cut{"tpcChi2Cut", 4.0, "tpcChi2Cut"};
Configurable<float> minqt{"minqt", 0.12, "min qt for kaon"};
Configurable<float> maxqt{"maxqt", 0.3, "max qt for kaon"};

Configurable<float> minPtMothmc{"minPtMothmc", 0.15, "Minimum pT of the mother"};
Configurable<int> centestimator{"centestimator", 0, "Select multiplicity estimator: 0 - FT0C, 1 - FT0A, 2 - FT0M, 3 - FV0A, 4 - PVTracks"};
Configurable<int> pid{"pid", 321, ""};
Configurable<int> dpid{"dpid", 13, ""};
Expand Down Expand Up @@ -400,14 +449,13 @@ struct SpectraKinkPiKa {
// Event selection
rEventSelection.add("hVertexZRec", "hVertexZRec", {HistType::kTH1F, {{200, -20.0, 20.0}}});
rEventSelection.add("hMultiplicity", "hMultiplicity", {HistType::kTH1F, {multAxis}});

rpiKkink.add("h2_dau_pt_vs_eta_rec", "pt_vs_eta_dau", {HistType::kTH3F, {ptAxis, etaAxis, multAxis}});
rpiKkink.add("h2_moth_pt_vs_eta_rec", "pt_vs_eta_moth", {HistType::kTH3F, {ptAxis, etaAxis, multAxis}});
rpiKkink.add("h2_pt_moth_vs_dau_rec", "pt_moth_vs_dau", {HistType::kTH2F, {ptAxis, ptAxis}});

rpiKkink.add("h2_qt_vs_pt", "qt_pt", {HistType::kTH2F, {qtAxis, ptAxis}});
if (additionalhist) {
rpiKkink.add("h2_dau_pt_vs_eta_rec", "pt_vs_eta_dau", {HistType::kTH3F, {ptAxis, etaAxis, multAxis}});
rpiKkink.add("h2_moth_pt_vs_eta_rec", "pt_vs_eta_moth", {HistType::kTH3F, {ptAxis, etaAxis, multAxis}});
rpiKkink.add("h2_pt_moth_vs_dau_rec", "pt_moth_vs_dau", {HistType::kTH2F, {ptAxis, ptAxis}});
rpiKkink.add("h2_qt_vs_pt", "qt_pt", {HistType::kTH2F, {qtAxis, ptAxis}});
}
rpiKkink.add("h2_kink_angle", "kink angle", {HistType::kTH2F, {ptAxis, kinkAxis}});

// inv mass
rpiKkink.add("h2_kaon_data", "h2_kaon_data", HistType::kTHnSparseF, {massAxis, ptAxis, qtAxis, multAxis}, true);
rpiKkink.add("h1_tracks_data", "track_cut_data", {HistType::kTH1F, {{17, 0.5, 17.5}}});
Expand Down Expand Up @@ -454,19 +502,19 @@ struct SpectraKinkPiKa {
}
if (doprocessMC) {

rpiKkink.add("h2_qt", "qt", {HistType::kTH1F, {qtAxis}});
rpiKkink.add("h2_kaon_pt_vs_rap_rec_full", "pt_vs_rap_kaon", {HistType::kTH2F, {ptAxis, etaAxis}});
rpiKkink.add("h2_kaon_pt_vs_rap_rec_full1", "pt_vs_rap_kaon1", {HistType::kTH2F, {ptAxis, etaAxis}});
// rpiKkink.add("h2_kaon_pt_vs_qt_rec_full1", "pt_vs_qt_kaon1", {HistType::kTH2F, {ptAxis, qtAxis}});
rpiKkink.add("h2_kaon_pt_vs_qt_rec_full1", "pt_vs_qt_kaon1", {HistType::kTH1F, {qtAxis}});

rpiKkink.add("h2_moth_ptrapqt_egen", "pt_vs_rap_qt_egen", {HistType::kTH3F, {ptAxis, etaAxis, qtAxis}});
rpiKkink.add("h2_moth_ptrapqt_mugen", "pt_vs_rap_qt_mugen", {HistType::kTH3F, {ptAxis, etaAxis, qtAxis}});
rpiKkink.add("h2_moth_ptrapqt_pigen", "pt_vs_rap_qt_pigen", {HistType::kTH3F, {ptAxis, etaAxis, qtAxis}});
rpiKkink.add("h2_moth_ptrapqt_egen", "pt_vs_rap_qt_egen", {HistType::kTH2F, {ptAxis, qtAxis}});
rpiKkink.add("h2_moth_ptrapqt_mugen", "pt_vs_rap_qt_mugen", {HistType::kTH2F, {ptAxis, qtAxis}});
rpiKkink.add("h2_moth_ptrapqt_pigen", "pt_vs_rap_qt_pigen", {HistType::kTH2F, {ptAxis, qtAxis}});

rpiKkink.add("h2_dau_pt_vs_eta_gen", "pt_vs_eta_dau", {HistType::kTH2F, {ptAxis, etaAxis}});
rpiKkink.add("h2_moth_pt_vs_eta_gen", "pt_vs_eta_moth", {HistType::kTH2F, {ptAxis, etaAxis}});
rpiKkink.add("h2_moth_pt_vs_rap_genall", "pt_vs_rap_moth", {HistType::kTH2F, {ptAxis, etaAxis}});
rpiKkink.add("h2_pt_moth_vs_dau_gen", "pt_moth_vs_dau", {HistType::kTH2F, {ptAxis, ptAxis}});
rpiKkink.add("h1_tracks", "track_cut", {HistType::kTH1F, {{17, 0.5, 17.5}}});
rpiKkink.add("h1_tracks", "track_cut", {HistType::kTH1F, {{18, 0.5, 18.5}}});
rpiKkink.add("h1_tracks_gen", "track_cut_gen", {HistType::kTH1F, {{15, 0.5, 15.5}}});
rpiKkink.add("h2_qt_gen", "qt", {HistType::kTH1F, {qtAxis}});
rpiKkink.add("h2_qt_rec", "qt", {HistType::kTH1F, {qtAxis}});
Expand Down Expand Up @@ -576,10 +624,8 @@ struct SpectraKinkPiKa {
continue;
rpiKkink.fill(HIST("h1_tracks_data"), 6.0);
if (qa) {

rpiKkink.fill(HIST("tpc_dedx"), v0.P(), mothTrack.tpcSignal());
rpiKkink.fill(HIST("tpc_nsigma_kaon"), v0.Pt(), mothTrack.tpcNSigmaKa());

rpiKkink.fill(HIST("tr_chi2nclM"), mothTrack.tpcChi2NCl());
rpiKkink.fill(HIST("tr_chi2nclD"), dauTrack.tpcChi2NCl());
rpiKkink.fill(HIST("tr_tpcnclfindM"), mothTrack.tpcNClsFound());
Expand Down Expand Up @@ -685,7 +731,6 @@ struct SpectraKinkPiKa {
if (!collision.selection_bit(o2::aod::evsel::kNoTimeFrameBorder) || !collision.selection_bit(o2::aod::evsel::kNoITSROFrameBorder)) {
continue;
}

float multiplicity{-1};
const int kCentFT0C = 0;
const int kCentFT0A = 1;
Expand Down Expand Up @@ -743,7 +788,6 @@ struct SpectraKinkPiKa {
if (qa) {
rpiKkink.fill(HIST("tpc_dedx"), v0.P(), mothTrack.tpcSignal());
rpiKkink.fill(HIST("tpc_nsigma_kaon"), v0.Pt(), mothTrack.tpcNSigmaKa());

rpiKkink.fill(HIST("tr_chi2nclM"), mothTrack.tpcChi2NCl());
rpiKkink.fill(HIST("tr_chi2nclD"), dauTrack.tpcChi2NCl());
rpiKkink.fill(HIST("tr_tpcnclfindM"), mothTrack.tpcNClsFound());
Expand Down Expand Up @@ -803,9 +847,6 @@ struct SpectraKinkPiKa {
// Compute transverse component
TVector3 motherDir(v0.Px(), v0.Py(), v0.Pz());
double ptd = pdlab.Perp(motherDir); // or p_d_lab.Mag() * sin(theta)

rpiKkink.fill(HIST("h2_qt"), ptd);

double mass = computeMotherMass(v0, v1);

rpiKkink.fill(HIST("h2_kaon_mc_rec"), mass, v0.Pt(), ptd, multiplicity);
Expand All @@ -818,31 +859,30 @@ struct SpectraKinkPiKa {
if (!mcTrackMoth.isPhysicalPrimary())
continue;
rpiKkink.fill(HIST("h1_tracks"), 13.0);

if (std::abs(mcTrackMoth.pdgCode()) != pid)
continue;
rpiKkink.fill(HIST("h2_kaon_pt_vs_rap_rec_full1"), v0.Pt(), v0.Rapidity());
rpiKkink.fill(HIST("h1_tracks"), 14.0);
// rpiKkink.fill(HIST("h2_kaon_pt_vs_qt_rec_full1"), v0.Pt(), ptd);
rpiKkink.fill(HIST("h2_kaon_pt_vs_qt_rec_full1"), ptd);

if (mcLabDau.has_mcParticle()) {
auto mcTrackDau = mcLabDau.mcParticle_as<aod::McParticles>();
if (!mcTrackDau.has_mothers())
continue;
rpiKkink.fill(HIST("h1_tracks"), 14.0);
rpiKkink.fill(HIST("h1_tracks"), 15.0);
const int process = 4;
if (mcTrackDau.getProcess() != process)
continue;

rpiKkink.fill(HIST("h1_tracks"), 15.0);

rpiKkink.fill(HIST("h1_tracks"), 16.0);
for (const auto& piMother : mcTrackDau.mothers_as<aod::McParticles>()) {
if (piMother.globalIndex() != mcTrackMoth.globalIndex()) {
continue;
}
// std::cout<<piMother.pdgCode()<<" check--- "<<mcTrackMoth.pdgCode()<<std::endl;
rpiKkink.fill(HIST("h1_tracks"), 16.0);
rpiKkink.fill(HIST("h1_tracks"), 17.0);
if (dpidCut && std::abs(mcTrackDau.pdgCode()) != dpid) {
continue;
}
rpiKkink.fill(HIST("h1_tracks"), 17.0);
rpiKkink.fill(HIST("h1_tracks"), 18.0);
if (additionalhist) {
rpiKkink.fill(HIST("h2_moth_pt_vs_eta_rec_m"), v0.Pt(), v0.Eta(), multiplicity);
rpiKkink.fill(HIST("h2_dau_pt_vs_eta_rec_m"), v1.Pt(), v1.Eta(), multiplicity);
Expand Down Expand Up @@ -892,6 +932,9 @@ struct SpectraKinkPiKa {
if (std::abs(v0.Rapidity()) > rapCut) {
continue;
}
if (std::abs(v0.Pt()) < minPtMothmc) {
continue;
}
rpiKkink.fill(HIST("h2_moth_pt_vs_rap_genall"), v0.Pt(), v0.Rapidity());
rpiKkink.fill(HIST("h1_tracks_gen"), 3.0);
if (!mcPart.has_daughters()) {
Expand All @@ -904,24 +947,26 @@ struct SpectraKinkPiKa {
double ptd = 0;
const int process = 4;
for (const auto& daughter : mcPart.daughters_as<aod::McParticles>()) {
v1.SetCoordinates(daughter.px(), daughter.py(), daughter.pz(), o2::constants::physics::MassMuon);
if (daughter.getProcess() != process)
continue;
v1.SetCoordinates(daughter.px(), daughter.py(), daughter.pz(), o2::constants::physics::MassMuon);
ptd = computeQt(v0, v1);
if (std::abs(daughter.pdgCode()) == kElectron) {
eld++;
} else if (std::abs(daughter.pdgCode()) == kMuonPlus) {
} else if (std::abs(daughter.pdgCode()) == dpid) {
muond++;
} else if (std::abs(daughter.pdgCode()) == kPiPlus) {
piond++;
}
}
if (eld >= 1)
rpiKkink.fill(HIST("h2_moth_ptrapqt_egen"), v0.Pt(), v0.Rapidity(), ptd);
if (muond >= 1)
rpiKkink.fill(HIST("h2_moth_ptrapqt_mugen"), v0.Pt(), v0.Rapidity(), ptd);
if (piond >= 1)
rpiKkink.fill(HIST("h2_moth_ptrapqt_pigen"), v0.Pt(), v0.Rapidity(), ptd);
if (additionalhist) {
if (eld >= 1)
rpiKkink.fill(HIST("h2_moth_ptrapqt_egen"), v0.Pt(), ptd);
if (muond >= 1)
rpiKkink.fill(HIST("h2_moth_ptrapqt_mugen"), v0.Pt(), ptd);
if (piond >= 1)
rpiKkink.fill(HIST("h2_moth_ptrapqt_pigen"), v0.Pt(), ptd);
}
rpiKkink.fill(HIST("h1_tracks_gen"), 5.0);
float pMoth = v0.P();
float pDaug = v1.P();
Expand Down
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