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Please consider the following formatting changes to #10954 #10955

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c367896
feat(nucleiFilter): Implement 2-body vertex finding for He-V0 selection
mpuccio Apr 23, 2025
dd1a311
Please consider the following formatting changes
alibuild Apr 23, 2025
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62 changes: 45 additions & 17 deletions EventFiltering/PWGLF/nucleiFilter.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,7 @@ struct nucleiFilter {
Configurable<float> cfgCutDCAxy{"cfgCutDCAxy", 3, "Max DCAxy"};
Configurable<float> cfgCutDCAz{"cfgCutDCAz", 10, "Max DCAz"};
Configurable<float> cfgCutKstar{"cfgCutKstar", 1.f, "Kstar cut for triton femto trigger"};
Configurable<double> cfgCutCosPAheV0{"cfgCutCosPAheV0", 0.99, "CosPA cut for HeV0"};

Configurable<LabeledArray<double>> cfgBetheBlochParams{"cfgBetheBlochParams", {betheBlochDefault[0], nNuclei, 6, nucleiNames, betheBlochParNames}, "TPC Bethe-Bloch parameterisation for light nuclei"};
Configurable<LabeledArray<double>> cfgMomentumScalingBetheBloch{"cfgMomentumScalingBetheBloch", {bbMomScalingDefault[0], nNuclei, 2, nucleiNames, matterOrNot}, "TPC Bethe-Bloch momentum scaling for light nuclei"};
Expand All @@ -112,16 +113,17 @@ struct nucleiFilter {

// variable/tool for hypertriton 3body decay
int mRunNumber;
float d_bz;
float mBz;
Service<o2::ccdb::BasicCCDBManager> ccdb;
using TrackCandidates = soa::Join<aod::TracksIU, aod::TracksExtra, aod::TracksCovIU, aod::TrackSelection, aod::TracksDCA, aod::EvTimeTOFFT0ForTrack, aod::pidTPCFullPi, aod::pidTPCFullPr, aod::pidTPCFullDe, aod::pidTPCFullTr, aod::pidTPCFullHe, aod::pidTPCFullAl, aod::pidTOFFullDe, aod::pidTOFFullTr, aod::pidTOFFullHe, aod::pidTOFFullAl>; // FIXME: positio has been changed
o2::aod::pidtofgeneric::TofPidNewCollision<TrackCandidates::iterator> bachelorTOFPID;
o2::base::MatLayerCylSet* lut = nullptr;
o2::vertexing::DCAFitterN<2> fitter2body;
o2::vertexing::DCAFitterN<3> fitter3body;
o2::pid::tof::TOFResoParamsV2 mRespParamsV2;
// configurable for hypertriton 3body decay
struct : ConfigurableGroup {
Configurable<double> d_bz_input{"trgH3L3Body.d_bz", -999, "bz field, -999 is automatic"};
Configurable<double> bFieldInput{"trgH3L3Body.mBz", -999, "bz field, -999 is automatic"};
Configurable<float> minCosPA3body{"trgH3L3Body.minCosPA3body", 0.9995, "minCosPA3body"};
Configurable<float> dcavtxdau{"trgH3L3Body.dcavtxdau", 0.02, "meen DCA among Daughters"};
Configurable<float> dcapiontopv{"trgH3L3Body.dcapiontopv", 0.05, "DCA Pion To PV"};
Expand Down Expand Up @@ -200,6 +202,14 @@ struct nucleiFilter {
fitter3body.setMaxChi2(1e9);
fitter3body.setUseAbsDCA(true);

fitter2body.setPropagateToPCA(true);
fitter2body.setMaxR(200.);
fitter2body.setMinParamChange(1e-3);
fitter2body.setMinRelChi2Change(0.9);
fitter2body.setMaxDZIni(1e9);
fitter2body.setMaxChi2(1e9);
fitter2body.setUseAbsDCA(true);

ccdb->setURL(trgH3L3Body.ccdburl);
ccdb->setCaching(true);
ccdb->setLocalObjectValidityChecking();
Expand All @@ -213,12 +223,11 @@ struct nucleiFilter {
}

// In case override, don't proceed, please - no CCDB access required
if (trgH3L3Body.d_bz_input > -990) {
d_bz = trgH3L3Body.d_bz_input;
fitter3body.setBz(d_bz);
if (trgH3L3Body.bFieldInput > -990) {
mBz = trgH3L3Body.bFieldInput;
o2::parameters::GRPMagField grpmag;
if (std::fabs(d_bz) > 1e-5) {
grpmag.setL3Current(30000.f / (d_bz / 5.0f));
if (std::fabs(mBz) > 1e-5) {
grpmag.setL3Current(30000.f / (mBz / 5.0f));
}
o2::base::Propagator::initFieldFromGRP(&grpmag);
mRunNumber = bc.runNumber();
Expand All @@ -231,22 +240,23 @@ struct nucleiFilter {
if (grpo) {
o2::base::Propagator::initFieldFromGRP(grpo);
// Fetch magnetic field from ccdb for current collision
d_bz = grpo->getNominalL3Field();
LOG(info) << "Retrieved GRP for timestamp " << run3grp_timestamp << " with magnetic field of " << d_bz << " kZG";
mBz = grpo->getNominalL3Field();
LOG(info) << "Retrieved GRP for timestamp " << run3grp_timestamp << " with magnetic field of " << mBz << " kZG";
} else {
grpmag = ccdb->getForTimeStamp<o2::parameters::GRPMagField>(trgH3L3Body.grpmagPath, run3grp_timestamp);
if (!grpmag) {
LOG(fatal) << "Got nullptr from CCDB for path " << trgH3L3Body.grpmagPath << " of object GRPMagField and " << trgH3L3Body.grpPath << " of object GRPObject for timestamp " << run3grp_timestamp;
}
o2::base::Propagator::initFieldFromGRP(grpmag);
// Fetch magnetic field from ccdb for current collision
// d_bz = std::lround(5.f * grpmag->getL3Current() / 30000.f);
d_bz = o2::base::Propagator::Instance()->getNominalBz();
LOG(info) << "Retrieved GRP for timestamp " << run3grp_timestamp << " with magnetic field of " << d_bz << " kZG";
// mBz = std::lround(5.f * grpmag->getL3Current() / 30000.f);
mBz = o2::base::Propagator::Instance()->getNominalBz();
LOG(info) << "Retrieved GRP for timestamp " << run3grp_timestamp << " with magnetic field of " << mBz << " kZG";
}
mRunNumber = bc.runNumber();
// Set magnetic field value once known
fitter3body.setBz(d_bz);
fitter2body.setBz(mBz);
fitter3body.setBz(mBz);

if (trgH3L3Body.useMatCorrType == 2) {
// setMatLUT only after magfield has been initalized
Expand Down Expand Up @@ -457,11 +467,29 @@ struct nucleiFilter {
float nSigmas[2]{
cfgBetheBlochParams->get(2, 5u) > 0.f ? getNsigma(posTrack, 2, 0) : posTrack.tpcNSigmaHe(),
cfgBetheBlochParams->get(2, 5u) > 0.f ? getNsigma(negTrack, 2, 1) : negTrack.tpcNSigmaHe()};
if ((nSigmas[0] > cfgCutsPID->get(2, 0u) && nSigmas[0] < cfgCutsPID->get(2, 1u)) ||
(nSigmas[1] > cfgCutsPID->get(2, 0u) && nSigmas[1] < cfgCutsPID->get(2, 1u))) {
keepEvent[kHeV0] = true;
break;
if ((nSigmas[0] < cfgCutsPID->get(2, 0u) || nSigmas[0] > cfgCutsPID->get(2, 1u)) &&
(nSigmas[1] < cfgCutsPID->get(2, 0u) || nSigmas[1] > cfgCutsPID->get(2, 1u))) {
continue;
}
int n2bodyVtx = fitter2body.process(getTrackParCov(posTrack), getTrackParCov(negTrack));
if (n2bodyVtx == 0) {
continue;
}
auto vtxXYZ = fitter2body.getPCACandidate();
o2::gpu::gpustd::array<float, 3> mom = {0.};
vtxXYZ[0] -= collision.posX();
vtxXYZ[1] -= collision.posY();
vtxXYZ[2] -= collision.posZ();
auto momTrackParCov = fitter2body.createParentTrackPar();
momTrackParCov.getPxPyPzGlo(mom);
double cosPA = (vtxXYZ[0] * mom[0] + vtxXYZ[1] * mom[1] + vtxXYZ[2] * mom[2]) /
std::sqrt((vtxXYZ[0] * vtxXYZ[0] + vtxXYZ[1] * vtxXYZ[1] + vtxXYZ[2] * vtxXYZ[2]) *
(mom[0] * mom[0] + mom[1] * mom[1] + mom[2] * mom[2]));
if (cosPA < cfgCutCosPAheV0) {
continue;
}
keepEvent[kHeV0] = true;
break;
}

//
Expand Down