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Merged
dsekihat merged 1 commit into from
Sep 7, 2025
Merged

[PWGEM/Dilepton] update polarization frame #12893

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60 changes: 44 additions & 16 deletions PWGEM/Dilepton/Core/Dilepton.h
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Original file line number Diff line number Diff line change
Expand Up @@ -60,14 +60,14 @@
#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;

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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::EMEventsQvec>;
using MyCollision = MyCollisions::iterator;
Expand Down Expand Up @@ -113,7 +113,7 @@
Configurable<uint64_t> ndiff_bc_mix{"ndiff_bc_mix", 594, "difference in global BC required in mixed events"};
ConfigurableAxis ConfVtxBins{"ConfVtxBins", {VARIABLE_WIDTH, -10.0f, -8.f, -6.f, -4.f, -2.f, 0.f, 2.f, 4.f, 6.f, 8.f, 10.f}, "Mixing bins - z-vertex"};
ConfigurableAxis ConfCentBins{"ConfCentBins", {VARIABLE_WIDTH, 0.0f, 5.0f, 10.0f, 20.0f, 30.0f, 40.0f, 50.0f, 60.0f, 70.0f, 80.0f, 90.0f, 100.f, 999.f}, "Mixing bins - centrality"};
ConfigurableAxis ConfEPBins{"ConfEPBins", {16, -M_PI / 2, +M_PI / 2}, "Mixing bins - event plane angle"};

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[external-pi] 

Use the PI constant (and its multiples and fractions) defined in o2::constants::math.
ConfigurableAxis ConfOccupancyBins{"ConfOccupancyBins", {VARIABLE_WIDTH, -1, 1e+10}, "Mixing bins - occupancy"};
Configurable<std::string> cfg_swt_name{"cfg_swt_name", "fHighTrackMult", "desired software trigger name"}; // 1 trigger name per 1 task. fHighTrackMult, fHighFt0Mult
// Configurable<int> cfgNtracksPV08Min{"cfgNtracksPV08Min", -1, "min. multNTracksPV"};
Expand All @@ -121,6 +121,7 @@
Configurable<bool> cfgApplyWeightTTCA{"cfgApplyWeightTTCA", false, "flag to apply weighting by 1/N"};
Configurable<uint> cfgDCAType{"cfgDCAType", 0, "type of DCA for output. 0:3D, 1:XY, 2:Z, else:3D"};
Configurable<bool> cfgUseSignedDCA{"cfgUseSignedDCA", false, "flag to use signs in the DCA calculation"};
Configurable<int> cfgPolarizationFrame{"cfgPolarizationFrame", 0, "frame of polarization. 0:CS, 1:HX, else:FATAL"};

ConfigurableAxis ConfMllBins{"ConfMllBins", {VARIABLE_WIDTH, 0.00, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1.00, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.10, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00, 2.10, 2.20, 2.30, 2.40, 2.50, 2.60, 2.70, 2.75, 2.80, 2.85, 2.90, 2.95, 3.00, 3.05, 3.10, 3.15, 3.20, 3.25, 3.30, 3.35, 3.40, 3.45, 3.50, 3.55, 3.60, 3.65, 3.70, 3.75, 3.80, 3.85, 3.90, 3.95, 4.00}, "mll bins for output histograms"};
ConfigurableAxis ConfPtllBins{"ConfPtllBins", {VARIABLE_WIDTH, 0.00, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 6.00, 7.00, 8.00, 9.00, 10.00}, "pTll bins for output histograms"};
Expand All @@ -130,7 +131,7 @@
// ConfigurableAxis ConfMmumuBins{"ConfMmumuBins", {VARIABLE_WIDTH, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1.00, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.10, 1.11,1.12,1.13,1.14,1.15,1.16,1.17,1.18,1.19, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00, 2.10, 2.20, 2.30, 2.40, 2.50, 2.60, 2.70, 2.75, 2.80, 2.85, 2.90, 2.95, 3.00, 3.05, 3.10, 3.15, 3.20, 3.25, 3.30, 3.35, 3.40, 3.45, 3.50, 3.55, 3.60, 3.65, 3.70, 3.75, 3.80, 3.85, 3.90, 3.95, 4.00, 4.10, 4.20, 4.30, 4.40, 4.50, 4.60, 4.70, 4.80, 4.90, 5.00, 5.10, 5.20, 5.30, 5.40, 5.50, 5.60, 5.70, 5.80, 5.90, 6.00, 6.10, 6.20, 6.30, 6.40, 6.50, 6.60, 6.70, 6.80, 6.90, 7.00, 7.10, 7.20, 7.30, 7.40, 7.50, 7.60, 7.70, 7.80, 7.90, 8.00, 8.10, 8.20, 8.30, 8.40, 8.50, 8.60, 8.70, 8.80, 8.90, 9.00, 9.10, 9.20, 9.30, 9.40, 9.50, 9.60, 9.70, 9.80, 9.90, 10.00, 10.10, 10.20, 10.30, 10.40, 10.50, 10.60, 10.70, 10.80, 10.90, 11.00, 11.50, 12.00}, "mmumu bins for output histograms"}; // for dimuon. one can copy bins here to hyperloop page.

ConfigurableAxis ConfSPBins{"ConfSPBins", {200, -5, 5}, "SP bins for flow analysis"};
ConfigurableAxis ConfPolarizationPhiBins{"ConfPolarizationPhiBins", {6, 0.f, M_PI}, "phi bins for polarization analysis"};

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[external-pi] 

Use the PI constant (and its multiples and fractions) defined in o2::constants::math.
ConfigurableAxis ConfPolarizationCosThetaBins{"ConfPolarizationCosThetaBins", {5, 0.f, 1.f}, "phi bins for polarization analysis"};

EMEventCut fEMEventCut;
Expand Down Expand Up @@ -571,8 +572,17 @@
const AxisSpec axis_aco{10, 0, 1.f, "#alpha = 1 - #frac{|#varphi_{l^{+}} - #varphi_{l^{-}}|}{#pi}"};
const AxisSpec axis_asym_pt{10, 0, 1.f, "A = #frac{|p_{T,l^{+}} - p_{T,l^{-}}|}{|p_{T,l^{+}} + p_{T,l^{-}}|}"};
const AxisSpec axis_dphi_e_ee{18, 0, M_PI, "#Delta#varphi = #varphi_{l} - #varphi_{ll} (rad.)"};
const AxisSpec axis_cos_theta_cs{ConfPolarizationCosThetaBins, "|cos(#theta^{CS})|"};
fRegistry.add("Pair/same/uls/hs", "dilepton", kTHnSparseD, {axis_mass, axis_pt, axis_dca, axis_y, axis_aco, axis_asym_pt, axis_dphi_e_ee, axis_cos_theta_cs}, true);

std::string frameName = "CS";
if (cfgPolarizationFrame == 0) {
frameName = "CS";
} else if (cfgPolarizationFrame == 1) {
frameName = "HX";
} else {
LOG(fatal) << "set 0 or 1 to cfgPolarizationFrame!";
}
const AxisSpec axis_cos_theta{ConfPolarizationCosThetaBins, Form("|cos(#theta^{%s})|", frameName.data())};
fRegistry.add("Pair/same/uls/hs", "dilepton", kTHnSparseD, {axis_mass, axis_pt, axis_dca, axis_y, axis_aco, axis_asym_pt, axis_dphi_e_ee, axis_cos_theta}, true);
fRegistry.addClone("Pair/same/uls/", "Pair/same/lspp/");
fRegistry.addClone("Pair/same/uls/", "Pair/same/lsmm/");
fRegistry.addClone("Pair/same/", "Pair/mix/");
Expand All @@ -594,9 +604,18 @@
fRegistry.addClone("Pair/mix/uls/", "Pair/mix/lsmm/");

} else if (cfgAnalysisType == static_cast<int>(o2::aod::pwgem::dilepton::utils::pairutil::DileptonAnalysisType::kPolarization)) {
const AxisSpec axis_cos_theta_cs{ConfPolarizationCosThetaBins, "|cos(#theta^{CS})|"};
const AxisSpec axis_phi_cs{ConfPolarizationPhiBins, "|#varphi^{CS}| (rad.)"};
fRegistry.add("Pair/same/uls/hs", "dilepton", kTHnSparseD, {axis_mass, axis_pt, axis_dca, axis_y, axis_cos_theta_cs, axis_phi_cs}, true);
std::string frameName = "CS";
if (cfgPolarizationFrame == 0) {
frameName = "CS";
} else if (cfgPolarizationFrame == 1) {
frameName = "HX";
} else {
LOG(fatal) << "set 0 or 1 to cfgPolarizationFrame!";
}

const AxisSpec axis_cos_theta{ConfPolarizationCosThetaBins, Form("|cos(#theta^{%s})|", frameName.data())};
const AxisSpec axis_phi{ConfPolarizationPhiBins, Form("|#varphi^{%s}| (rad.)", frameName.data())};
fRegistry.add("Pair/same/uls/hs", "dilepton", kTHnSparseD, {axis_mass, axis_pt, axis_dca, axis_y, axis_cos_theta, axis_phi}, true);
fRegistry.addClone("Pair/same/uls/", "Pair/same/lspp/");
fRegistry.addClone("Pair/same/uls/", "Pair/same/lsmm/");
fRegistry.addClone("Pair/same/", "Pair/mix/");
Expand Down Expand Up @@ -968,15 +987,20 @@
float dphi_e_ee = v1.Phi() - v12.Phi();
o2::math_utils::bringToPMPi(dphi_e_ee);

float cos_thetaCS = 999, phiCS = 999.f;
o2::aod::pwgem::dilepton::utils::pairutil::getAngleCS<false>(t1, t2, leptonM1, leptonM2, beamE1, beamE2, beamP1, beamP2, cos_thetaCS, phiCS);
float cos_thetaPol = 999, phiPol = 999.f;
if (cfgPolarizationFrame == 0) {
o2::aod::pwgem::dilepton::utils::pairutil::getAngleCS(std::array<float, 4>{t1.px(), t1.py(), t1.pz(), leptonM1}, std::array<float, 4>{t2.px(), t2.py(), t2.pz(), leptonM2}, beamE1, beamE2, beamP1, beamP2, t1.sign(), cos_thetaPol, phiPol);
} else if (cfgPolarizationFrame == 1) {
o2::aod::pwgem::dilepton::utils::pairutil::getAngleHX(std::array<float, 4>{t1.px(), t1.py(), t1.pz(), leptonM1}, std::array<float, 4>{t2.px(), t2.py(), t2.pz(), leptonM2}, beamE1, beamE2, beamP1, beamP2, t1.sign(), cos_thetaPol, phiPol);
}
o2::math_utils::bringToPMPi(phiPol);

if (t1.sign() * t2.sign() < 0) { // ULS
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("uls/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), aco, asym, std::fabs(dphi_e_ee), std::fabs(cos_thetaCS), weight);
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("uls/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), aco, asym, std::fabs(dphi_e_ee), std::fabs(cos_thetaPol), weight);
} else if (t1.sign() > 0 && t2.sign() > 0) { // LS++
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("lspp/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), aco, asym, std::fabs(dphi_e_ee), std::fabs(cos_thetaCS), weight);
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("lspp/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), aco, asym, std::fabs(dphi_e_ee), std::fabs(cos_thetaPol), weight);
} else if (t1.sign() < 0 && t2.sign() < 0) { // LS--
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("lsmm/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), aco, asym, std::fabs(dphi_e_ee), std::fabs(cos_thetaCS), weight);
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("lsmm/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), aco, asym, std::fabs(dphi_e_ee), std::fabs(cos_thetaPol), weight);
}
} else if (cfgAnalysisType == static_cast<int>(o2::aod::pwgem::dilepton::utils::pairutil::DileptonAnalysisType::kFlowV2) || cfgAnalysisType == static_cast<int>(o2::aod::pwgem::dilepton::utils::pairutil::DileptonAnalysisType::kFlowV3)) {
std::array<float, 2> q2ft0m = {collision.q2xft0m(), collision.q2yft0m()};
Expand Down Expand Up @@ -1020,16 +1044,20 @@
}
}
} else if (cfgAnalysisType == static_cast<int>(o2::aod::pwgem::dilepton::utils::pairutil::DileptonAnalysisType::kPolarization)) {
float cos_thetaCS = 999, phiCS = 999.f;
o2::aod::pwgem::dilepton::utils::pairutil::getAngleCS<false>(t1, t2, leptonM1, leptonM2, beamE1, beamE2, beamP1, beamP2, cos_thetaCS, phiCS);
o2::math_utils::bringToPMPi(phiCS);
float cos_thetaPol = 999, phiPol = 999.f;
if (cfgPolarizationFrame == 0) {
o2::aod::pwgem::dilepton::utils::pairutil::getAngleCS(std::array<float, 4>{t1.px(), t1.py(), t1.pz(), leptonM1}, std::array<float, 4>{t2.px(), t2.py(), t2.pz(), leptonM2}, beamE1, beamE2, beamP1, beamP2, t1.sign(), cos_thetaPol, phiPol);
} else if (cfgPolarizationFrame == 1) {
o2::aod::pwgem::dilepton::utils::pairutil::getAngleHX(std::array<float, 4>{t1.px(), t1.py(), t1.pz(), leptonM1}, std::array<float, 4>{t2.px(), t2.py(), t2.pz(), leptonM2}, beamE1, beamE2, beamP1, beamP2, t1.sign(), cos_thetaPol, phiPol);
}
o2::math_utils::bringToPMPi(phiPol);

if (t1.sign() * t2.sign() < 0) { // ULS
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("uls/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), std::fabs(cos_thetaCS), std::fabs(phiCS), weight);
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("uls/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), std::fabs(cos_thetaPol), std::fabs(phiPol), weight);
} else if (t1.sign() > 0 && t2.sign() > 0) { // LS++
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("lspp/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), std::fabs(cos_thetaCS), std::fabs(phiCS), weight);
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("lspp/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), std::fabs(cos_thetaPol), std::fabs(phiPol), weight);
} else if (t1.sign() < 0 && t2.sign() < 0) { // LS--
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("lsmm/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), std::fabs(cos_thetaCS), std::fabs(phiCS), weight);
fRegistry.fill(HIST("Pair/") + HIST(event_pair_types[ev_id]) + HIST("lsmm/hs"), v12.M(), v12.Pt(), pair_dca, v12.Rapidity(), std::fabs(cos_thetaPol), std::fabs(phiPol), weight);
}
} else if (cfgAnalysisType == static_cast<int>(o2::aod::pwgem::dilepton::utils::pairutil::DileptonAnalysisType::kHFll)) {
float dphi = v1.Phi() - v2.Phi();
Expand Down
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