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Merged
dsekihat merged 1 commit into from
Dec 2, 2025
+52 −29
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[PWGEM/Dilepton] add a beta histogram in dileptonPolarization.cxx #14056

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80 changes: 51 additions & 29 deletions PWGEM/Dilepton/Tasks/dileptonPolarization.cxx
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright 2019-2020 CERN and copyright holders of ALICE O2.

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[name/o2-task] 

Specify task name only when it cannot be derived from the struct name. Only append to the default name.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
Expand Down Expand Up @@ -60,7 +60,7 @@

struct DileptonPolarization {
// Configurables
Configurable<std::string> ccdburl{"ccdb-url", "http://alice-ccdb.cern.ch", "url of the ccdb repository"};

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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.)
// Configurable<std::string> grpPath{"grpPath", "GLO/GRP/GRP", "Path of the grp file"};
// Configurable<std::string> grpmagPath{"grpmagPath", "GLO/Config/GRPMagField", "CCDB path of the GRPMagField object"};
// Configurable<bool> skipGRPOquery{"skipGRPOquery", true, "skip grpo query"};
Expand All @@ -70,13 +70,15 @@
Configurable<int> cfgOccupancyEstimator{"cfgOccupancyEstimator", 0, "FT0C:0, Track:1"};
Configurable<bool> cfgDoMix{"cfgDoMix", true, "flag for event mixing"};
Configurable<int> ndepth{"ndepth", 10000, "depth for event mixing"};
Configurable<uint64_t> ndiff_bc_mix{"ndiff_bc_mix", 594, "difference in global BC required in mixed events"};

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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.)
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"};

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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.)
ConfigurableAxis ConfCentBins{"ConfCentBins", {VARIABLE_WIDTH, 0.0f, 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"};

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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.)
ConfigurableAxis ConfEPBins{"ConfEPBins", {1, -M_PI / 2, +M_PI / 2}, "Mixing bins - event plane angle"};
ConfigurableAxis ConfOccupancyBins{"ConfOccupancyBins", {VARIABLE_WIDTH, -1, 1e+10}, "Mixing bins - occupancy"};
Configurable<int> cfgPolarizationFrame{"cfgPolarizationFrame", 0, "frame of polarization. 0:CS, 1:HX, else:FATAL"};
Configurable<bool> cfgUseAbs{"cfgUseAbs", false, "flag to use absolute value for cos_theta and phi"}; // this is to increase statistics per bin.
Configurable<bool> cfgDoULS{"cfgDoULS", true, "flag to perform ULS pairing"};
Configurable<bool> cfgDoLS{"cfgDoLS", true, "flag to perform LS pairing"};

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, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 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, 11.1, 11.2, 11.3, 11.4, 11.50, 11.6, 11.7, 11.8, 11.9, 12.0}, "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 Down Expand Up @@ -124,10 +126,10 @@

struct : ConfigurableGroup {
std::string prefix = "accBins";
Configurable<float> cfgDM{"cfgDM", 0.1, "dm for lorentz boost"};
Configurable<float> cfgDPt{"cfgDPt", 0.1, "dpT for lorentz boost"};
Configurable<float> cfgDEta{"cfgDEta", 0.1, "deta for lorentz boost"};
Configurable<float> cfgDPhi{"cfgDPhi", 0.1, "dphi (rad.) for lorentz boost"};
Configurable<float> cfgRelDM{"cfgRelDM", 0.01, "rel. dm for lorentz boost"};
Configurable<float> cfgRelDPx{"cfgRelDPx", 0.01, "rel. dpx for lorentz boost"};
Configurable<float> cfgRelDPy{"cfgRelDPy", 0.01, "rel. dpy for lorentz boost"};
Configurable<float> cfgRelDPz{"cfgRelDPz", 0.01, "rel. dpz for lorentz boost"};
} accBins;

Service<o2::ccdb::BasicCCDBManager> ccdb;
Expand Down Expand Up @@ -374,11 +376,15 @@
const AxisSpec axis_phi{ConfPolarizationPhiBins, Form("#varphi^{%s} (rad.)", frameName.data())};
const AxisSpec axis_quadmom{ConfPolarizationQuadMomBins, Form("#frac{3 cos^{2}(#theta^{%s}) -1}{2}", frameName.data())};
fRegistry.add("Pair/same/uls/hs", "dilepton", kTHnSparseD, {axis_mass, axis_pt, axis_dca, axis_y, axis_cos_theta, axis_phi, axis_quadmom}, true);
fRegistry.add("Pair/same/uls/hEta", "#eta_{ll}", kTH1D, {{2000, -10, 10}}, true);

fRegistry.addClone("Pair/same/uls/", "Pair/same/lspp/");
fRegistry.addClone("Pair/same/uls/", "Pair/same/lsmm/");
fRegistry.addClone("Pair/same/", "Pair/mix/");
fRegistry.add("Pair/same/uls/hEta", "#eta_{ll}", kTH1D, {{2000, -10, 10}}, true);
fRegistry.add("Pair/mix/uls/hBeta", "#beta for Lorentz boost;#beta^{same};(#beta^{mix} - #beta^{same})/#beta^{same}", kTH2D, {{100, 0, 1}, {400, -0.2, 0.2}}, true);
fRegistry.add("Pair/mix/uls/hBetaX", "#beta_{X} for Lorentz boost;#beta_{x}^{same};(#beta_{x}^{mix} - #beta_{x}^{same})/#beta_{x}^{same}", kTH2D, {{100, 0, 1}, {400, -0.2, 0.2}}, true);
fRegistry.add("Pair/mix/uls/hBetaY", "#beta_{Y} for Lorentz boost;#beta_{y}^{same};(#beta_{y}^{mix} - #beta_{y}^{same})/#beta_{y}^{same}", kTH2D, {{100, 0, 1}, {400, -0.2, 0.2}}, true);
fRegistry.add("Pair/mix/uls/hBetaZ", "#beta_{Z} for Lorentz boost;#beta_{z}^{same};(#beta_{z}^{mix} - #beta_{z}^{same})/#beta_{z}^{same}", kTH2D, {{100, 0, 1}, {400, -0.2, 0.2}}, true);
}

template <int ev_id, typename TCollision, typename TDilepton>
Expand Down Expand Up @@ -475,7 +481,7 @@
auto v_pos = empair1.getPositiveLeg(); // pt, eta, phi, M
auto arrD = std::array<float, 4>{static_cast<float>(v_pos.Px()), static_cast<float>(v_pos.Py()), static_cast<float>(v_pos.Pz()), leptonM1};

auto pairs_from_col2_sliced = std::views::filter(pairs_from_col2, [&](EMPair t) { return std::fabs(t.mass() - empair1.mass()) < accBins.cfgDM && std::fabs(t.pt() - empair1.pt()) < accBins.cfgDPt && std::fabs(t.eta() - empair1.eta()) < accBins.cfgDEta && std::fabs(RecoDecay::constrainAngle(t.phi() - empair1.phi(), -o2::constants::math::PI, 1U)) < accBins.cfgDPhi; });
auto pairs_from_col2_sliced = std::views::filter(pairs_from_col2, [&](EMPair t) { return std::fabs(t.mass() - empair1.mass()) / empair1.mass() < accBins.cfgRelDM && std::fabs((t.px() - empair1.px()) / empair1.px()) < accBins.cfgRelDPx && std::fabs((t.py() - empair1.py()) / empair1.py()) < accBins.cfgRelDPy && std::fabs((t.pz() - empair1.pz()) / empair1.pz()) < accBins.cfgRelDPz; });
for (const auto& empair2 : pairs_from_col2_sliced) {
auto arrM = std::array<float, 4>{static_cast<float>(empair2.px()), static_cast<float>(empair2.py()), static_cast<float>(empair2.pz()), static_cast<float>(empair2.mass())};
// LOGF(info, "[col1, col2] : empair1.mass() = %f, empair1.pt() = %f, empair1.eta() = %f, empair1.phi() = %f, empair2.mass() = %f, empair2.pt() = %f, empair2.eta() = %f, empair2.phi() = %f", empair1.mass(), empair1.pt(), empair1.eta(), empair1.phi(), empair2.mass(), empair2.pt(), empair2.eta(), empair2.phi());
Expand All @@ -493,14 +499,18 @@
phiPol = std::fabs(phiPol);
}
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hs"), empair1.mass(), empair1.pt(), empair1.getPairDCA(), empair1.rapidity(), cos_thetaPol, phiPol, quadmom, weight);
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hBeta"), empair1.p() / empair1.e(), (empair2.p() / empair2.e() - empair1.p() / empair1.e()) / (empair1.p() / empair1.e()));
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hBetaX"), empair1.px() / empair1.e(), (empair2.px() / empair2.e() - empair1.px() / empair1.e()) / (empair1.px() / empair1.e()));
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hBetaY"), empair1.py() / empair1.e(), (empair2.py() / empair2.e() - empair1.py() / empair1.e()) / (empair1.py() / empair1.e()));
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hBetaZ"), empair1.pz() / empair1.e(), (empair2.pz() / empair2.e() - empair1.pz() / empair1.e()) / (empair1.pz() / empair1.e()));
}
}

for (const auto& empair2 : pairs_from_col2) {
auto v_pos = empair2.getPositiveLeg(); // pt, eta, phi, M
auto arrD = std::array<float, 4>{static_cast<float>(v_pos.Px()), static_cast<float>(v_pos.Py()), static_cast<float>(v_pos.Pz()), leptonM2};

auto pairs_from_col1_sliced = std::views::filter(pairs_from_col1, [&](EMPair t) { return std::fabs(t.mass() - empair2.mass()) < accBins.cfgDM && std::fabs(t.pt() - empair2.pt()) < accBins.cfgDPt && std::fabs(t.eta() - empair2.eta()) < accBins.cfgDEta && std::fabs(RecoDecay::constrainAngle(t.phi() - empair2.phi(), -o2::constants::math::PI, 1U)) < accBins.cfgDPhi; });
auto pairs_from_col1_sliced = std::views::filter(pairs_from_col1, [&](EMPair t) { return std::fabs(t.mass() - empair2.mass()) / empair2.mass() < accBins.cfgRelDM && std::fabs((t.px() - empair2.px()) / empair2.px()) < accBins.cfgRelDPx && std::fabs((t.py() - empair2.py()) / empair2.py()) < accBins.cfgRelDPy && std::fabs((t.pz() - empair2.pz()) / empair2.pz()) < accBins.cfgRelDPz; });
for (const auto& empair1 : pairs_from_col1_sliced) {
auto arrM = std::array<float, 4>{static_cast<float>(empair1.px()), static_cast<float>(empair1.py()), static_cast<float>(empair1.pz()), static_cast<float>(empair2.mass())};
// LOGF(info, "[col2, col1] : empair2.mass() = %f, empair2.pt() = %f, empair2.eta() = %f, empair2.phi() = %f, empair1.mass() = %f, empair1.pt() = %f, empair1.eta() = %f, empair1.phi() = %f", empair2.mass(), empair2.pt(), empair2.eta(), empair2.phi(), empair1.mass(), empair1.pt(), empair1.eta(), empair1.phi());
Expand All @@ -518,6 +528,10 @@
phiPol = std::fabs(phiPol);
}
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hs"), empair2.mass(), empair2.pt(), empair2.getPairDCA(), empair2.rapidity(), cos_thetaPol, phiPol, quadmom, weight);
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hBeta"), empair2.p() / empair2.e(), (empair1.p() / empair1.e() - empair2.p() / empair2.e()) / (empair2.p() / empair2.e()));
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hBetaX"), empair2.px() / empair2.e(), (empair1.px() / empair1.e() - empair2.px() / empair2.e()) / (empair2.px() / empair2.e()));
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hBetaY"), empair2.py() / empair2.e(), (empair1.py() / empair1.e() - empair2.py() / empair2.e()) / (empair2.py() / empair2.e()));
fRegistry.fill(HIST("Pair/mix/") + HIST(pair_sign_types[signType]) + HIST("hBetaZ"), empair2.pz() / empair2.e(), (empair1.pz() / empair1.e() - empair2.pz() / empair2.e()) / (empair2.pz() / empair2.e()));
}
}

Expand Down Expand Up @@ -573,21 +587,21 @@
int zbin = lower_bound(zvtx_bin_edges.begin(), zvtx_bin_edges.end(), collision.posZ()) - zvtx_bin_edges.begin() - 1;
if (zbin < 0) {
zbin = 0;
} else if (static_cast<int>(zvtx_bin_edges.size()) - 2 < zbin) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
zbin = static_cast<int>(zvtx_bin_edges.size()) - 2;
}

int centbin = lower_bound(cent_bin_edges.begin(), cent_bin_edges.end(), centrality) - cent_bin_edges.begin() - 1;
if (centbin < 0) {
centbin = 0;
} else if (static_cast<int>(cent_bin_edges.size()) - 2 < centbin) {

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[magic-number] 

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centbin = static_cast<int>(cent_bin_edges.size()) - 2;
}

int epbin = lower_bound(ep_bin_edges.begin(), ep_bin_edges.end(), ep2) - ep_bin_edges.begin() - 1;
if (epbin < 0) {
epbin = 0;
} else if (static_cast<int>(ep_bin_edges.size()) - 2 < epbin) {

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epbin = static_cast<int>(ep_bin_edges.size()) - 2;
}

Expand All @@ -602,7 +616,7 @@

if (occbin < 0) {
occbin = 0;
} else if (static_cast<int>(occ_bin_edges.size()) - 2 < occbin) {

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occbin = static_cast<int>(occ_bin_edges.size()) - 2;
}

Expand All @@ -612,31 +626,34 @@
// LOGF(info, "collision.globalIndex() = %d, dileptons_uls_per_coll.size() = %d, dileptons_lspp_per_coll.size() = %d, dileptons_lsmm_per_coll.size() = %d", collision.globalIndex(), dileptons_uls_per_coll.size(), dileptons_lspp_per_coll.size(), dileptons_lsmm_per_coll.size());

int nuls = 0, nlspp = 0, nlsmm = 0;
for (const auto& dilepton : dileptons_uls_per_coll) { // ULS
bool is_pair_ok = fillPairInfo<0>(collision, dilepton);
if (is_pair_ok) {
nuls++;
if (cfgDoULS) {
for (const auto& dilepton : dileptons_uls_per_coll) { // ULS
bool is_pair_ok = fillPairInfo<0>(collision, dilepton);
if (is_pair_ok) {
nuls++;
}
}
}
for (const auto& dilepton : dileptons_lspp_per_coll) { // LS++
bool is_pair_ok = fillPairInfo<0>(collision, dilepton);
if (is_pair_ok) {
nlspp++;

if (cfgDoLS) {
for (const auto& dilepton : dileptons_lspp_per_coll) { // LS++
bool is_pair_ok = fillPairInfo<0>(collision, dilepton);
if (is_pair_ok) {
nlspp++;
}
}
}
for (const auto& dilepton : dileptons_lsmm_per_coll) { // LS--
bool is_pair_ok = fillPairInfo<0>(collision, dilepton);
if (is_pair_ok) {
nlsmm++;
for (const auto& dilepton : dileptons_lsmm_per_coll) { // LS--
bool is_pair_ok = fillPairInfo<0>(collision, dilepton);
if (is_pair_ok) {
nlsmm++;
}
}
}

if (!cfgDoMix || !(nuls > 0 || nlspp > 0 || nlsmm > 0)) {
continue;
}

// LOGF(info, "collision.globalIndex() = %d, collision.posZ() = %f, centrality = %f, ep2 = %f, collision.ft0cOccupancyInTimeRange() = %f, zbin = %d, centbin = %d, epbin = %d, occbin = %d", collision.globalIndex(), collision.posZ(), centrality, ep2, collision.ft0cOccupancyInTimeRange(), zbin, centbin, epbin, occbin);

auto key_bin = std::make_tuple(zbin, centbin, epbin, occbin);
auto key_df_collision = std::make_pair(ndf, collision.globalIndex()); // this gives the current event.

Expand All @@ -657,13 +674,18 @@
auto collisionIds_in_mixing_pool = emh_pair_uls->GetCollisionIdsFromEventPool(key_bin);
LOGF(info, "iz = %d, icent = %d, iep = %d, iocc = %d, collisionIds_in_mixing_pool.size() = %d", iz, icent, iep, iocc, collisionIds_in_mixing_pool.size());

fillMixedPairInfo<0>(collisionIds_in_mixing_pool, emh_pair_uls);
fillMixedPairInfo<1>(collisionIds_in_mixing_pool, emh_pair_lspp);
fillMixedPairInfo<2>(collisionIds_in_mixing_pool, emh_pair_lsmm);
}
}
}
}
if (cfgDoULS) {
fillMixedPairInfo<0>(collisionIds_in_mixing_pool, emh_pair_uls);
}
if (cfgDoLS) {
fillMixedPairInfo<1>(collisionIds_in_mixing_pool, emh_pair_lspp);
fillMixedPairInfo<2>(collisionIds_in_mixing_pool, emh_pair_lsmm);
}

} // end of iocc loop
} // end of iep loop
} // end of icent loop
} // end of iz loop

delete emh_pair_uls;
emh_pair_uls = 0x0;
Expand All @@ -685,5 +707,5 @@
};
WorkflowSpec defineDataProcessing(ConfigContext const& cfgc)
{
return WorkflowSpec{adaptAnalysisTask<DileptonPolarization>(cfgc, TaskName{"dilepton-polarization"})};

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[name/o2-task] 

Specified task name dilepton-polarization and the struct name DileptonPolarization produce the same device name dilepton-polarization. TaskName is redundant.
}
1 change: 1 addition & 0 deletions PWGEM/Dilepton/Utils/EMTrack.h
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ class EMTrack
float px() const { return fPt * std::cos(fPhi); }
float py() const { return fPt * std::sin(fPhi); }
float pz() const { return fPt * std::sinh(fEta); }
float e() const { return std::sqrt(std::pow(fPt * std::cosh(fEta), 2) + std::pow(fMass, 2)); } // e2 = p2 + m2
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@vkucera vkucera Dec 2, 2025

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You could just use std::hypot or RecoDecay::e. Btw, all these calculations are available as RecoDecay methods.

float signed1Pt() const { return fCharge * 1.f / fPt; }

protected:
Expand Down
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