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dsekihat merged 2 commits into from
Oct 23, 2025
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[PWGEM/Dilepton] update DileptonMC for acc #13504

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5b64739
PWGEM/Dilepton: update DileptonMC for acc
dsekihat Oct 23, 2025
de8bf42
Comment out unused float variables in DileptonMC.h
dsekihat Oct 23, 2025
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159 changes: 149 additions & 10 deletions PWGEM/Dilepton/Core/DileptonMC.h
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Original file line number Diff line number Diff line change
Expand Up @@ -55,14 +55,14 @@
#include <utility>
#include <vector>

using namespace o2;

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[using-directive] 

Do not put using directives at global scope in headers.
using namespace o2::aod;

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[using-directive] 

Do not put using directives at global scope in headers.
using namespace o2::framework;

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[using-directive] 

Do not put using directives at global scope in headers.
using namespace o2::framework::expressions;

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[using-directive] 

Do not put using directives at global scope in headers.
using namespace o2::soa;

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[using-directive] 

Do not put using directives at global scope in headers.
using namespace o2::aod::pwgem::dilepton::utils::mcutil;

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[using-directive] 

Do not put using directives at global scope in headers.
using namespace o2::aod::pwgem::dilepton::utils::emtrackutil;

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[using-directive] 

Do not put using directives at global scope in headers.
using namespace o2::aod::pwgem::dilepton::utils::pairutil;

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[using-directive] 

Do not put using directives at global scope in headers.

using MyCollisions = soa::Join<aod::EMEvents, aod::EMEventsMult, aod::EMEventsCent, aod::EMMCEventLabels>;
using MyCollision = MyCollisions::iterator;
Expand Down Expand Up @@ -369,7 +369,8 @@
const AxisSpec axis_pt{ConfPtllBins, pair_pt_axis_title};
const AxisSpec axis_y{ConfYllBins, pair_y_axis_title};
const AxisSpec axis_dca{ConfDCAllBins, pair_dca_axis_title};
const AxisSpec axis_pt_meson{ConfPtllBins, "p_{T} (GeV/c)"}; // for omega, phi meson pT spectra
const AxisSpec axis_pt_meson{ConfPtllBins, "p_{T}^{VM} (GeV/c)"}; // for omega, phi meson pT spectra
const AxisSpec axis_y_meson{ConfYllBins, "y^{VM}"}; // for omega, phi meson pT spectra

const AxisSpec axis_dca_narrow{ConfDCAllNarrowBins, pair_dca_axis_title};
const AxisSpec axis_dpt{ConfDPtBins, "#Delta p_{T,1}^{gen-rec} + #Delta p_{T,2}^{gen-rec} (GeV/c)"};
Expand Down Expand Up @@ -415,9 +416,6 @@
// fRegistry.addClone("Generated/sm/PromptPi0/", "Generated/sm/Upsilon2S/");
// fRegistry.addClone("Generated/sm/PromptPi0/", "Generated/sm/Upsilon3S/");

fRegistry.add("Generated/sm/Omega2ll/uls/hPtY", "pT of #omega meson", kTH2D, {axis_y, axis_pt_meson}, true);
fRegistry.add("Generated/sm/Phi2ll/uls/hPtY", "pT of #phi meson", kTH2D, {axis_y, axis_pt_meson}, true);

fRegistry.add("Generated/ccbar/c2l_c2l/uls/hs", "generated dilepton", kTHnSparseD, {axis_mass, axis_pt, axis_y, axis_dphi_ee, axis_deta_ee, axis_cos_theta_pol, axis_phi_pol, axis_quadmom, axis_aco, axis_asym_pt, axis_dphi_e_ee}, true);
fRegistry.addClone("Generated/ccbar/c2l_c2l/uls/", "Generated/ccbar/c2l_c2l/lspp/");
fRegistry.addClone("Generated/ccbar/c2l_c2l/uls/", "Generated/ccbar/c2l_c2l/lsmm/");
Expand Down Expand Up @@ -461,6 +459,14 @@
}
}

// evaluate acceptance for polarization
fRegistry.add("Generated/VM/All/Phi/hs", "gen. VM #rightarrow ll", kTHnSparseD, {axis_mass, axis_pt, axis_y, axis_cos_theta_pol, axis_phi_pol, axis_quadmom}, true);
fRegistry.addClone("Generated/VM/All/Phi/", "Generated/VM/All/Rho/");
fRegistry.addClone("Generated/VM/All/Phi/", "Generated/VM/All/Omega/");
fRegistry.addClone("Generated/VM/All/Phi/", "Generated/VM/All/PromptJPsi/");
fRegistry.addClone("Generated/VM/All/Phi/", "Generated/VM/All/NonPromptJPsi/");
fRegistry.addClone("Generated/VM/All/", "Generated/VM/Acc/");

// reconstructed pair info
fRegistry.add("Pair/sm/Photon/uls/hs", "rec. dilepton", kTHnSparseD, {axis_mass, axis_pt, axis_y, axis_dphi_ee, axis_deta_ee, axis_cos_theta_pol, axis_phi_pol, axis_quadmom, axis_aco, axis_asym_pt, axis_dphi_e_ee, axis_dca}, true);

Expand Down Expand Up @@ -542,6 +548,11 @@
fRegistry.addClone("Pair/corr_bkg_lh/", "Pair/corr_bkg_hh/");
fRegistry.addClone("Pair/corr_bkg_lh/", "Pair/comb_bkg/");

if (doprocessGen_VM) {
fRegistry.add("Generated/VM/Omega/hPtY", "pT vs. y of #omega", kTH2D, {axis_y_meson, axis_pt_meson}, true); // for pT spectrum
fRegistry.add("Generated/VM/Phi/hPtY", "pT vs. y of #phi", kTH2D, {axis_y_meson, axis_pt_meson}, true); // for pT spectrum
}

if (cfgFillUnfolding) {
// for 2D unfolding
const AxisSpec axis_mass_gen{ConfMllBins, "m_{ll}^{gen} (GeV/c^{2})"};
Expand Down Expand Up @@ -590,12 +601,12 @@
DefineDielectronCut();
leptonM1 = o2::constants::physics::MassElectron;
leptonM2 = o2::constants::physics::MassElectron;
pdg_lepton = 11;

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[pdg/explicit-code] 

Avoid hard-coded PDG codes. Use named values from PDG_t or o2::constants::physics::Pdg instead.
} else if constexpr (pairtype == o2::aod::pwgem::dilepton::utils::pairutil::DileptonPairType::kDimuon) {
DefineDimuonCut();
leptonM1 = o2::constants::physics::MassMuon;
leptonM2 = o2::constants::physics::MassMuon;
pdg_lepton = 13;

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[pdg/explicit-code] 

Avoid hard-coded PDG codes. Use named values from PDG_t or o2::constants::physics::Pdg instead.
}
if (doprocessNorm) {
fRegistry.addClone("Event/before/hCollisionCounter", "Event/norm/hCollisionCounter");
Expand Down Expand Up @@ -880,6 +891,17 @@
eta = lepton.eta();
}

return isInAcceptance(pt, eta);

// if ((mctrackcuts.min_mcPt < pt && pt < mctrackcuts.max_mcPt) && (mctrackcuts.min_mcEta < eta && eta < mctrackcuts.max_mcEta)) {
// return true;
// } else {
// return false;
// }
}

bool isInAcceptance(const float pt, const float eta)
{
if ((mctrackcuts.min_mcPt < pt && pt < mctrackcuts.max_mcPt) && (mctrackcuts.min_mcEta < eta && eta < mctrackcuts.max_mcEta)) {
return true;
} else {
Expand Down Expand Up @@ -1825,7 +1847,6 @@
o2::math_utils::bringToPMPi(phiPol);
float quadmom = (3.f * std::pow(cos_thetaPol, 2) - 1.f) / 2.f;

// bool isInAcc = isInAcceptance<isSmeared>(t1) && isInAcceptance<isSmeared>(t2);
if (!isInAcceptance<isSmeared>(t1) || !isInAcceptance<isSmeared>(t2)) {
return false;
}
Expand Down Expand Up @@ -1897,7 +1918,7 @@
case static_cast<int>(EM_HFeeType::kBCe_Be_SameB):
fillGenHistograms<18>(sign1, sign2, 0, 0, v12.M(), v12.Pt(), v12.Rapidity(), dphi, deta, cos_thetaPol, phiPol, quadmom, aco, asym, std::fabs(dphi_e_ee), weight); // b2c2l_b2l_sameb
break;
case static_cast<int>(EM_HFeeType::kBCe_Be_DiffB): // LS
case static_cast<int>(EM_HFeeType::kBCe_Be_DiffB):
fillGenHistograms<19>(sign1, sign2, 0, 0, v12.M(), v12.Pt(), v12.Rapidity(), dphi, deta, cos_thetaPol, phiPol, quadmom, aco, asym, std::fabs(dphi_e_ee), weight); // b2c2l_b2l_diffb
break;
default:
Expand All @@ -1907,6 +1928,113 @@
return false;
}

template <typename TMCParticle, typename TMCParticles>
bool fillGenParticleAcc(TMCParticle const& mcParticle, TMCParticles const& mcParticles)
{
if (!mcParticle.isPhysicalPrimary() && !mcParticle.producedByGenerator()) {
return false;
}
if (mcParticle.daughtersIds().size() < 2) {
return false;
}

if constexpr (pairtype == o2::aod::pwgem::dilepton::utils::pairutil::DileptonPairType::kDielectron) {
if (mcParticle.y() < dielectroncuts.cfg_min_pair_y || dielectroncuts.cfg_max_pair_y < mcParticle.y()) {
return false;
}
} else if constexpr (pairtype == o2::aod::pwgem::dilepton::utils::pairutil::DileptonPairType::kDimuon) {
if (mcParticle.y() < dimuoncuts.cfg_min_pair_y || dimuoncuts.cfg_max_pair_y < mcParticle.y()) {
return false;
}
}

int pdg = mcParticle.pdgCode();
if (std::abs(pdg) == 113 && mcParticle.daughtersIds().size() != 2) { // reject dalitz decay
return false;
}
if (std::abs(pdg) == 223 && mcParticle.daughtersIds().size() != 2) { // reject dalitz decay
return false;
}
if (std::abs(pdg) == 333 && mcParticle.daughtersIds().size() != 2) { // reject dalitz decay
return false;
}
// accept radiative decay of charmonia (ee + multiple gamma).

// float pt1 = 0.f, eta1 = 0.f, phi1 = 0.f, sign1 = 0.f;
// float pt2 = 0.f, eta2 = 0.f, phi2 = 0.f, sign2 = 0.f;
std::vector<std::array<float, 4>> vDau;
vDau.reserve(mcParticle.daughtersIds().size());
for (const auto& daughterId : mcParticle.daughtersIds()) {
auto dau = mcParticles.rawIteratorAt(daughterId);
if (std::abs(dau.pdgCode()) == pdg_lepton) {
vDau.emplace_back(std::array<float, 4>{dau.pt(), dau.eta(), dau.phi(), dau.pdgCode() > 0 ? -1.f : +1.f});
}
}
if (vDau.size() != 2 || vDau[0][3] * vDau[1][3] > 0.f) { // decay objects must be ULS 2 leptons.
vDau.clear();
vDau.shrink_to_fit();
return false;
}

// LOGF(info, "mcParticle.globalIndex() = %d, mcParticle.pdgCode() = %d, mcParticle.daughtersIds().size() = %d", mcParticle.globalIndex(), mcParticle.pdgCode(), mcParticle.daughtersIds().size());

ROOT::Math::PtEtaPhiMVector v1(vDau[0][0], vDau[0][1], vDau[0][2], leptonM1);
ROOT::Math::PtEtaPhiMVector v2(vDau[1][0], vDau[1][1], vDau[1][2], leptonM2);
ROOT::Math::PtEtaPhiMVector v12 = v1 + v2;

std::array<float, 4> arrP1 = {static_cast<float>(v1.Px()), static_cast<float>(v1.Py()), static_cast<float>(v1.Pz()), leptonM1};
std::array<float, 4> arrP2 = {static_cast<float>(v2.Px()), static_cast<float>(v2.Py()), static_cast<float>(v2.Pz()), leptonM2};
float cos_thetaPol = 999, phiPol = 999.f;
if (cfgPolarizationFrame == 0) {
o2::aod::pwgem::dilepton::utils::pairutil::getAngleCS(arrP1, arrP2, beamE1, beamE2, beamP1, beamP2, vDau[0][3] > 0 ? 1 : -1, cos_thetaPol, phiPol);
} else if (cfgPolarizationFrame == 1) {
o2::aod::pwgem::dilepton::utils::pairutil::getAngleHX(arrP1, arrP2, beamE1, beamE2, beamP1, beamP2, vDau[0][3] > 0 ? 1 : -1, cos_thetaPol, phiPol);
}
o2::math_utils::bringToPMPi(phiPol);
float quadmom = (3.f * std::pow(cos_thetaPol, 2) - 1.f) / 2.f;

float weight = 1.f;
switch (std::abs(mcParticle.pdgCode())) {
case 113:
fRegistry.fill(HIST("Generated/VM/All/Rho/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
if (isInAcceptance(v1.Pt(), v1.Eta()) && isInAcceptance(v2.Pt(), v2.Eta())) {
fRegistry.fill(HIST("Generated/VM/Acc/Rho/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
}
break;
case 223:
fRegistry.fill(HIST("Generated/VM/All/Omega/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
if (isInAcceptance(v1.Pt(), v1.Eta()) && isInAcceptance(v2.Pt(), v2.Eta())) {
fRegistry.fill(HIST("Generated/VM/Acc/Omega/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
}
break;
case 333:
fRegistry.fill(HIST("Generated/VM/All/Phi/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
if (isInAcceptance(v1.Pt(), v1.Eta()) && isInAcceptance(v2.Pt(), v2.Eta())) {
fRegistry.fill(HIST("Generated/VM/Acc/Phi/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
}
break;
case 443:
if (IsFromBeauty(mcParticle, mcParticles) > 0) {
fRegistry.fill(HIST("Generated/VM/All/NonPromptJPsi/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
if (isInAcceptance(v1.Pt(), v1.Eta()) && isInAcceptance(v2.Pt(), v2.Eta())) {
fRegistry.fill(HIST("Generated/VM/Acc/NonPromptJPsi/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
}
} else {
fRegistry.fill(HIST("Generated/VM/All/PromptJPsi/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
if (isInAcceptance(v1.Pt(), v1.Eta()) && isInAcceptance(v2.Pt(), v2.Eta())) {
fRegistry.fill(HIST("Generated/VM/Acc/PromptJPsi/hs"), v12.M(), mcParticle.pt(), mcParticle.y(), cos_thetaPol, phiPol, quadmom, weight);
}
}
break;
default:
break;
}

vDau.clear();
vDau.shrink_to_fit();
return false;
}

template <bool isSmeared, typename TCollisions, typename TMCLeptons, typename TPreslice, typename TCut, typename TAllTracks, typename TMCCollisions, typename TMCParticles>
void runTruePairing(TCollisions const& collisions, TMCLeptons const& posTracks, TMCLeptons const& negTracks, TPreslice const& perCollision, TCut const& cut, TAllTracks const& tracks, TMCCollisions const& mccollisions, TMCParticles const& mcparticles)
{
Expand Down Expand Up @@ -1986,7 +2114,19 @@

for (const auto& [t1, t2] : combinations(CombinationsStrictlyUpperIndexPolicy(negTracks_per_coll, negTracks_per_coll))) { // LS--
fillGenPairInfo<isSmeared>(t1, t2, mcparticles);
} // end of true LS++ pair loop
} // end of true LS-- pair loop

// acceptance for polarization of vector mesons
auto mcParticles_per_coll = mcparticles.sliceBy(perMcCollision, mccollision.globalIndex());
for (const auto& mcParticle : mcParticles_per_coll) {
if (!mcParticle.isPhysicalPrimary() && !mcParticle.producedByGenerator()) {
continue;
}
int pdg = std::abs(mcParticle.pdgCode());
if (pdg == 113 || pdg == 223 || pdg == 333 || pdg == 443) { // select only VMs
fillGenParticleAcc(mcParticle, mcparticles); // VMs that decay into dilepton are stored in derived data. This is sufficient for polarization.
}
} // end of mc particle loop
} // end of collision loop
}

Expand Down Expand Up @@ -2462,7 +2602,6 @@
auto mctracks_per_coll = mcparticles.sliceBy(perMcCollision_vm, mccollision.globalIndex());

for (const auto& mctrack : mctracks_per_coll) {

if (!(mctrack.isPhysicalPrimary() || mctrack.producedByGenerator())) {
continue;
}
Expand All @@ -2479,10 +2618,10 @@

switch (std::abs(mctrack.pdgCode())) {
case 223:
fRegistry.fill(HIST("Generated/sm/Omega2ll/uls/hPtY"), mctrack.y(), mctrack.pt(), 1.f / mctrack.dsf());
fRegistry.fill(HIST("Generated/VM/Omega/hPtY"), mctrack.y(), mctrack.pt(), 1.f / mctrack.dsf());
break;
case 333:
fRegistry.fill(HIST("Generated/sm/Phi2ll/uls/hPtY"), mctrack.y(), mctrack.pt(), 1.f / mctrack.dsf());
fRegistry.fill(HIST("Generated/VM/Phi/hPtY"), mctrack.y(), mctrack.pt(), 1.f / mctrack.dsf());
break;
default:
break;
Expand Down
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