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[PWGEM/PhotonMeson] Include check for gamma gamma contamination in Dalitz decays #16327

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91 changes: 62 additions & 29 deletions PWGEM/PhotonMeson/Core/Pi0EtaToGammaGammaMC.h
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,7 @@
#include <Math/Vector4Dfwd.h>
#include <TF1.h>
#include <TH2.h>
#include <TPDGCode.h>
#include <TString.h>

#include <cmath>
Expand All @@ -74,24 +75,25 @@

template <o2::aod::pwgem::photonmeson::photonpair::PairType pairtype, o2::soa::is_table... Types>
struct Pi0EtaToGammaGammaMC {
o2::framework::Configurable<std::string> ccdburl{"ccdb-url", "http://alice-ccdb.cern.ch", "url of the ccdb repository"};
o2::framework::Configurable<std::string> ccdbUrl{"ccdbUrl", "http://alice-ccdb.cern.ch", "url of the ccdb repository"};
o2::framework::Configurable<std::string> grpPath{"grpPath", "GLO/GRP/GRP", "Path of the grp file"};
o2::framework::Configurable<std::string> grpmagPath{"grpmagPath", "GLO/Config/GRPMagField", "CCDB path of the GRPMagField object"};
o2::framework::Configurable<bool> skipGRPOquery{"skipGRPOquery", true, "skip grpo query"};
o2::framework::Configurable<float> d_bz_input{"d_bz_input", -999, "bz field in kG, -999 is automatic"};
o2::framework::Configurable<float> dBzInput{"dBzInput", -999, "bz field in kG, -999 is automatic"};

o2::framework::Configurable<int> cfgQvecEstimator{"cfgQvecEstimator", 0, "FT0M:0, FT0A:1, FT0C:2"};
o2::framework::Configurable<int> cfgCentEstimator{"cfgCentEstimator", 2, "FT0M:0, FT0A:1, FT0C:2"};
o2::framework::Configurable<float> cfgCentMin{"cfgCentMin", -1, "min. centrality"};
o2::framework::Configurable<float> cfgCentMax{"cfgCentMax", 999, "max. centrality"};
o2::framework::Configurable<float> maxY_rec{"maxY_rec", 0.9, "maximum rapidity for reconstructed particles"};
o2::framework::Configurable<std::string> fd_k0s_to_pi0{"fd_k0s_pi0", "1.0", "feed down correction to pi0"};
o2::framework::Configurable<float> maxYRec{"maxYRec", 0.9, "maximum rapidity for reconstructed particles"};
o2::framework::Configurable<std::string> fdK0sToPi0{"fdK0sPi0", "1.0", "feed down correction to pi0"};

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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.)
o2::framework::Configurable<bool> cfgRequireTrueAssociation{"cfgRequireTrueAssociation", false, "flag to require true mc collision association"};

o2::framework::Configurable<int> cfgAlphaMesonCut{"cfgAlphaMesonCut", 0, "flag for photon energy asymmetry distribution cut: 0: no cut, 1: cut specific value, 2: cut depending on pT"};
o2::framework::Configurable<float> cfgAlphaMeson{"cfgAlphaMeson", 0.65, "photon energy asymmetry distribution parameter for specific value cut"};
o2::framework::Configurable<float> cfgAlphaMesonA{"cfgAlphaMesonA", 0.65, "photon energy asymmetry distribution parameter A for pT dependent cut (A * tanh(B*pT))"};
o2::framework::Configurable<float> cfgAlphaMesonB{"cfgAlphaMesonB", 1.2, "photon energy asymmetry distribution parameter B for pT dependent cut (A * tanh(B*pT))"};
o2::framework::Configurable<bool> cfgGGContaCheck{"cfgGGContaCheck", false, "check gamma gamma contamination of dalitz"};

EMPhotonEventCut fEMEventCut;
struct : o2::framework::ConfigurableGroup {
Expand All @@ -117,15 +119,15 @@
V0PhotonCut fV0PhotonCut;
struct : o2::framework::ConfigurableGroup {
std::string prefix = "pcmcut_group";
o2::framework::Configurable<bool> cfg_require_v0_with_itstpc{"cfg_require_v0_with_itstpc", false, "flag to select V0s with ITS-TPC matched tracks"};

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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.)
o2::framework::Configurable<bool> cfg_require_v0_with_itsonly{"cfg_require_v0_with_itsonly", false, "flag to select V0s with ITSonly tracks"};

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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.)
o2::framework::Configurable<bool> cfg_require_v0_with_tpconly{"cfg_require_v0_with_tpconly", false, "flag to select V0s with TPConly tracks"};

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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.)
o2::framework::Configurable<float> cfg_min_pt_v0{"cfg_min_pt_v0", 0.1, "min pT for v0 photons at PV"};

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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.)
o2::framework::Configurable<float> cfg_max_pt_v0{"cfg_max_pt_v0", 1e+10, "max pT for v0 photons at PV"};

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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.)
o2::framework::Configurable<float> cfg_min_eta_v0{"cfg_min_eta_v0", -0.8, "min eta for v0 photons at PV"};

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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.)
o2::framework::Configurable<float> cfg_max_eta_v0{"cfg_max_eta_v0", 0.8, "max eta for v0 photons at PV"};

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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.)
o2::framework::Configurable<float> cfg_min_v0radius{"cfg_min_v0radius", 4.0, "min v0 radius"};

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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.)
o2::framework::Configurable<float> cfg_max_v0radius{"cfg_max_v0radius", 90.0, "max v0 radius"};

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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.)
o2::framework::Configurable<float> cfg_max_alpha_ap{"cfg_max_alpha_ap", 0.95, "max alpha for AP cut"};
o2::framework::Configurable<float> cfg_max_qt_ap{"cfg_max_qt_ap", 0.01, "max qT for AP cut"};
o2::framework::Configurable<float> cfg_min_cospa{"cfg_min_cospa", 0.999, "min V0 CosPA"};
Expand Down Expand Up @@ -224,7 +226,7 @@
o2::framework::Configurable<float> cfg_min_Ecluster{"cfg_min_Ecluster", 0.3, "Minimum cluster energy for PHOS in GeV"};
} phoscuts;

TF1* f1fd_k0s_to_pi0;
TF1* f1fdK0sToPi0;
o2::framework::HistogramRegistry fRegistry{"output", {}, o2::framework::OutputObjHandlingPolicy::AnalysisObject, false, false};
// static constexpr std::string_view event_types[2] = {"before/", "after/"};
// static constexpr std::string_view event_pair_types[2] = {"same/", "mix/"};
Expand All @@ -249,14 +251,20 @@
DefineEMCCut();
DefinePHOSCut();

f1fd_k0s_to_pi0 = new TF1("f1fd_k0s_to_pi0", TString(fd_k0s_to_pi0), 0.f, 100.f);
f1fdK0sToPi0 = new TF1("f1fdK0sToPi0", TString(fdK0sToPi0), 0.f, 100.f);

fRegistry.add("Event/hNrecPerMCCollision", "Nrec per mc collision;N_{rec} collisions per MC collision", o2::framework::HistType::kTH1F, {{21, -0.5f, 20.5f}}, false);
if (cfgGGContaCheck) {
fRegistry.add("Event/hNGGContamEta", "Number of Eta from etaToGammaGamma; p_{T, #eta} (GeV/#it{c}); N", o2::framework::HistType::kTH1F, {{40, -0.5f, 20.5f}}, false);
fRegistry.add("Event/hNGGContamPion", "Number of Pion from etaToGammaGamma; p_{T, #pi} (GeV/#it{c}); N", o2::framework::HistType::kTH1F, {{40, -0.5f, 20.5f}}, false);
}
fRegistry.add("Event/hNDalitzEtaPt", "Number of DalitzEta; p_{T, #eta} (GeV/#it{c}); N", o2::framework::HistType::kTH1F, {{40, -0.5f, 20.5f}}, false);
fRegistry.add("Event/hNDalitzPionPt", "Number of DalitzPion; p_{T, #pi} (GeV/#it{c}) ; N", o2::framework::HistType::kTH1F, {{40, -0.5f, 20.5f}}, false);

mRunNumber = 0;
d_bz = 0;

ccdb->setURL(ccdburl);
ccdb->setURL(ccdbUrl);
ccdb->setCaching(true);
ccdb->setLocalObjectValidityChecking();
ccdb->setFatalWhenNull(false);
Expand All @@ -270,10 +278,12 @@
}

// In case override, don't proceed, please - no CCDB access required
if (d_bz_input > -990) {
d_bz = d_bz_input;
constexpr float bzInput = -990.0f;
if (dBzInput > bzInput) {
d_bz = dBzInput;
o2::parameters::GRPMagField grpmag;
if (std::fabs(d_bz) > 1e-5) {
float bzThreshold = 1e-5;
if (std::fabs(d_bz) > bzThreshold) {
grpmag.setL3Current(30000.f / (d_bz / 5.0f));
}
mRunNumber = collision.runNumber();
Expand Down Expand Up @@ -304,8 +314,8 @@

~Pi0EtaToGammaGammaMC()
{
delete f1fd_k0s_to_pi0;
f1fd_k0s_to_pi0 = 0x0;
delete f1fdK0sToPi0;
f1fdK0sToPi0 = 0x0;
}

void DefineEMEventCut()
Expand Down Expand Up @@ -359,7 +369,7 @@
fV0PhotonCut.SetLoadMlModelsFromCCDB(pcmcuts.cfg_load_ml_models_from_ccdb);
fV0PhotonCut.SetNClassesMl(pcmcuts.cfg_nclasses_ml);
fV0PhotonCut.SetMlTimestampCCDB(pcmcuts.cfg_timestamp_ccdb);
fV0PhotonCut.SetCcdbUrl(ccdburl);
fV0PhotonCut.SetCcdbUrl(ccdbUrl);
CentType mCentralityTypeMlEnum;
mCentralityTypeMlEnum = static_cast<CentType>(cfgCentEstimator.value);
fV0PhotonCut.SetCentralityTypeMl(mCentralityTypeMlEnum);
Expand Down Expand Up @@ -572,18 +582,19 @@
TMCCollisions const& mccollisions, TMCParticles const& mcparticles,
TLegs const& /*legs*/ = nullptr, TMatchedTracks const& matchedTracks = nullptr, TMatchedSecondaries const& matchedSecondaries = nullptr)
{
for (auto& collision : collisions) {
for (auto const& collision : collisions) {
initCCDB(collision);
if ((pairtype == o2::aod::pwgem::photonmeson::photonpair::PairType::kPHOSPHOS || pairtype == o2::aod::pwgem::photonmeson::photonpair::PairType::kPCMPHOS) && !collision.alias_bit(triggerAliases::kTVXinPHOS)) {
continue;
}

float weight = 1.f;
float weightThreshold = 1e-10;
if constexpr (std::is_same_v<std::decay_t<TCollisions>, o2::soa::Filtered<o2::soa::Join<o2::soa::Join<o2::aod::PMEvents, o2::aod::EMEventsAlias, o2::aod::EMEventsMult_000, o2::aod::EMEventsCent_000, o2::aod::EMMCEventLabels>, o2::aod::EMEventsWeight>>>) {
weight = collision.weight();
}

if (eventcuts.onlyKeepWeightedEvents && std::fabs(weight - 1.0) < 1e-10) {
if (eventcuts.onlyKeepWeightedEvents && std::fabs(weight - 1.0) < weightThreshold) {
continue;
}

Expand Down Expand Up @@ -680,7 +691,7 @@
ROOT::Math::PtEtaPhiMVector v1(g1.pt(), g1.eta(), g1.phi(), 0.);
ROOT::Math::PtEtaPhiMVector v2(g2.pt(), g2.eta(), g2.phi(), 0.);
ROOT::Math::PtEtaPhiMVector v12 = v1 + v2;
if (std::fabs(v12.Rapidity()) > maxY_rec) {
if (std::fabs(v12.Rapidity()) > maxYRec) {
continue;
}

Expand Down Expand Up @@ -720,9 +731,9 @@
}

if (g1mc.globalIndex() == g2mc.globalIndex()) {
if (o2::aod::pwgem::dilepton::utils::mcutil::getMotherPDGCode(g1mc, mcparticles) == 111)
if (o2::aod::pwgem::dilepton::utils::mcutil::getMotherPDGCode(g1mc, mcparticles) == PDG_t::kPi0)
fRegistry.fill(HIST("Pair/Pi0/hs_FromSameGamma"), v12.M(), v12.Pt(), wpair);
else if (o2::aod::pwgem::dilepton::utils::mcutil::getMotherPDGCode(g1mc, mcparticles) == 221)
else if (o2::aod::pwgem::dilepton::utils::mcutil::getMotherPDGCode(g1mc, mcparticles) == o2::constants::physics::Pdg::kEta)
fRegistry.fill(HIST("Pair/Eta/hs_FromSameGamma"), v12.M(), v12.Pt(), wpair);
continue;
}
Expand All @@ -732,13 +743,13 @@
if (cfgRequireTrueAssociation && (pi0mc.emmceventId() != collision.emmceventId())) {
continue;
}
o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, v12, pi0mc, mcparticles, mccollisions, f1fd_k0s_to_pi0, wpair);
o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, v12, pi0mc, mcparticles, mccollisions, f1fdK0sToPi0, wpair);
} else if (etaid > 0) {
auto etamc = mcparticles.iteratorAt(etaid);
if (cfgRequireTrueAssociation && (etamc.emmceventId() != collision.emmceventId())) {
continue;
}
o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, v12, etamc, mcparticles, mccollisions, f1fd_k0s_to_pi0, wpair);
o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, v12, etamc, mcparticles, mccollisions, f1fdK0sToPi0, wpair);
}
} // end of pairing loop
} else if constexpr (pairtype == o2::aod::pwgem::photonmeson::photonpair::PairType::kPCMDalitzEE) {
Expand Down Expand Up @@ -792,6 +803,25 @@

auto pos2mc = mcparticles.iteratorAt(pos2.emmcparticleId());
auto ele2mc = mcparticles.iteratorAt(ele2.emmcparticleId());
if (cfgGGContaCheck) {
photonid2 = o2::aod::pwgem::dilepton::utils::mcutil::FindCommonMotherFrom2Prongs(pos2mc, ele2mc, -11, 11, 22, mcparticles); // check possible contamination
if (photonid2 > 0) {
auto photon2 = mcparticles.iteratorAt(photonid2);
int photon2pdg = photon2.pdgCode();
int photon2mothid = photon2.mothersIds()[0];
auto photon2moth = mcparticles.iteratorAt(photon2mothid);
if (photon2pdg == PDG_t::kGamma && (o2::aod::pwgem::photonmeson::utils::mcutil::isGammaGammaDecay(photon2moth, mcparticles))) {
int mothID = o2::aod::pwgem::dilepton::utils::mcutil::getMotherPDGCode(photon2, mcparticles);
if (mothID == o2::constants::physics::Pdg::kEta) {
fRegistry.fill(HIST("Event/hNGGContamEta"), photon2moth.pt());
}
if (mothID == PDG_t::kPi0) {
fRegistry.fill(HIST("Event/hNGGContamPion"), photon2moth.pt());
}
}
}
}

pi0id = o2::aod::pwgem::dilepton::utils::mcutil::FindCommonMotherFrom3Prongs(g1mc, pos2mc, ele2mc, 22, -11, 11, 111, mcparticles);
etaid = o2::aod::pwgem::dilepton::utils::mcutil::FindCommonMotherFrom3Prongs(g1mc, pos2mc, ele2mc, 22, -11, 11, 221, mcparticles);
if (pi0id < 0 && etaid < 0) {
Expand All @@ -800,21 +830,23 @@
ROOT::Math::PtEtaPhiMVector v_pos(pos2.pt(), pos2.eta(), pos2.phi(), o2::constants::physics::MassElectron);
ROOT::Math::PtEtaPhiMVector v_ele(ele2.pt(), ele2.eta(), ele2.phi(), o2::constants::physics::MassElectron);
ROOT::Math::PtEtaPhiMVector veeg = v_gamma + v_pos + v_ele;
if (std::fabs(veeg.Rapidity()) > maxY_rec) {
if (std::fabs(veeg.Rapidity()) > maxYRec) {
continue;
}
if (pi0id > 0) {
auto pi0mc = mcparticles.iteratorAt(pi0id);
fRegistry.fill(HIST("Event/hNDalitzPionPt"), pi0mc.pt());
if (cfgRequireTrueAssociation && (pi0mc.emmceventId() != collision.emmceventId())) {
continue;
}
o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, veeg, pi0mc, mcparticles, mccollisions, f1fd_k0s_to_pi0, weight);
o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, veeg, pi0mc, mcparticles, mccollisions, f1fdK0sToPi0, weight);
} else if (etaid > 0) {
auto etamc = mcparticles.iteratorAt(etaid);
fRegistry.fill(HIST("Event/hNDalitzEtaPt"), etamc.pt());
if (cfgRequireTrueAssociation && (etamc.emmceventId() != collision.emmceventId())) {
continue;
}
o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, veeg, etamc, mcparticles, mccollisions, f1fd_k0s_to_pi0, weight);
o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, veeg, etamc, mcparticles, mccollisions, f1fdK0sToPi0, weight);
}
} // end of dielectron loop
} // end of pcm loop
Expand Down Expand Up @@ -853,15 +885,15 @@
ROOT::Math::PtEtaPhiMVector v1(g1.pt(), g1.eta(), g1.phi(), 0.);
ROOT::Math::PtEtaPhiMVector v2(g2.pt(), g2.eta(), g2.phi(), 0.);
ROOT::Math::PtEtaPhiMVector v12 = v1 + v2;
if (std::fabs(v12.Rapidity()) > maxY_rec) {
if (std::fabs(v12.Rapidity()) > maxYRec) {
continue;
}
// if (pi0id > 0) {
// auto pi0mc = mcparticles.iteratorAt(pi0id);
// o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, v12, pi0mc, mcparticles, mccollisions, f1fd_k0s_to_pi0, weight);
// o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, v12, pi0mc, mcparticles, mccollisions, f1fdK0sToPi0, weight);
// } else if (etaid > 0) {
// auto etamc = mcparticles.iteratorAt(etaid);
// o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, v12, etamc, mcparticles, mccollisions, f1fd_k0s_to_pi0, weight);
// o2::aod::pwgem::photonmeson::utils::nmhistogram::fillTruePairInfo(&fRegistry, v12, etamc, mcparticles, mccollisions, f1fdK0sToPi0, weight);
// }
} // end of pairing loop
} // end of pairing in same event
Expand Down Expand Up @@ -900,23 +932,24 @@
// loop over mc stack and fill histograms for pure MC truth signals
// all MC tracks which belong to the MC event corresponding to the current reconstructed event

for (auto& mccollision : mccollisions) {
for (auto const& mccollision : mccollisions) {
auto collision_per_mccoll = collisions.sliceBy(rec_perMcCollision, mccollision.globalIndex());
int nrec_per_mc = collision_per_mccoll.size();
fRegistry.fill(HIST("Event/hNrecPerMCCollision"), nrec_per_mc);
}

for (auto& collision : collisions) {
for (auto const& collision : collisions) {
if ((pairtype == o2::aod::pwgem::photonmeson::photonpair::kPHOSPHOS || pairtype == o2::aod::pwgem::photonmeson::photonpair::kPCMPHOS) && !collision.alias_bit(triggerAliases::kTVXinPHOS)) {
continue; // I don't know why this is necessary in simulation.
}

float weight = 1.f;
float weightTreshhold = 1e-10;
if constexpr (std::is_same_v<std::decay_t<TCollisions>, o2::soa::Filtered<o2::soa::Join<o2::soa::Join<o2::aod::PMEvents, o2::aod::EMEventsAlias, o2::aod::EMEventsMult_000, o2::aod::EMEventsCent_000, o2::aod::EMMCEventLabels>, o2::aod::EMEventsWeight>>>) {
weight = collision.weight();
}

if (eventcuts.onlyKeepWeightedEvents && std::fabs(weight - 1.0) < 1e-10) {
if (eventcuts.onlyKeepWeightedEvents && std::fabs(weight - 1.0) < weightTreshhold) {
continue;
}

Expand Down
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