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gbencedi merged 1 commit into from
Jun 13, 2025
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[PWGLF] Updated the MC correction procedure #11590

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191 changes: 124 additions & 67 deletions PWGLF/Tasks/GlobalEventProperties/uccZdc.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -15,25 +15,14 @@
/// \author Omar Vazquez (omar.vazquez.rueda@cern.ch)
/// \since January 29, 2025

#include <CCDB/BasicCCDBManager.h>

#include <chrono>
#include <cmath>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <string>
#include <string_view>
#include <vector>
#include <TRandom.h>

#include "Common/CCDB/EventSelectionParams.h"
#include "Common/CCDB/TriggerAliases.h"
#include "Common/Core/TrackSelection.h"
#include "Common/DataModel/Centrality.h"
#include "Common/DataModel/EventSelection.h"
#include "Common/DataModel/Multiplicity.h"
#include "Common/DataModel/TrackSelectionTables.h"

#include "CommonConstants/MathConstants.h"
#include "CommonConstants/ZDCConstants.h"
#include "Framework/ASoAHelpers.h" // required for Filter op.
Expand All @@ -44,7 +33,20 @@
#include "Framework/runDataProcessing.h"
#include "ReconstructionDataFormats/GlobalTrackID.h"
#include "ReconstructionDataFormats/Track.h"
#include <CCDB/BasicCCDBManager.h>

#include "TPDGCode.h"
#include <TRandom.h>

#include <chrono>
#include <cmath>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <numeric>
#include <string>
#include <string_view>
#include <vector>

using namespace std;
using namespace o2;
Expand Down Expand Up @@ -81,6 +83,7 @@ struct UccZdc {
Configurable<bool> isZEMcut{"isZEMcut", true, "Use ZEM cut"};
Configurable<bool> useMidRapNchSel{"useMidRapNchSel", true, "Use mid-rapidit Nch selection"};
Configurable<bool> applyEff{"applyEff", true, "Apply track-by-track efficiency correction"};
Configurable<bool> correctNch{"correctNch", true, "Correct also Nch"};

// Event selection
Configurable<float> posZcut{"posZcut", +10.0, "z-vertex position cut"};
Expand Down Expand Up @@ -126,7 +129,8 @@ struct UccZdc {
ConfigurableAxis binsCent{"binsCent", {VARIABLE_WIDTH, 0., 10., 20., 30., 40., 50., 60., 70., 80., 90., 100.}, "T0C binning"};

// CCDB paths
Configurable<std::string> paTH{"paTH", "Users/o/omvazque/TrackingEfficiency", "base path to the ccdb object"};
Configurable<std::string> paTHEff{"paTHEff", "Users/o/omvazque/MCcorrection/perTimeStamp/TrackingEff", "base path to the ccdb object"};
Configurable<std::string> paTHFD{"paTHFD", "Users/o/omvazque/MCcorrection/perTimeStamp/FeedDown", "base path to the ccdb object"};
Configurable<std::string> paTHmeanNch{"paTHmeanNch", "Users/o/omvazque/FitMeanNch_9May2025", "base path to the ccdb object"};
Configurable<std::string> paTHsigmaNch{"paTHsigmaNch", "Users/o/omvazque/FitSigmaNch_9May2025", "base path to the ccdb object"};
Configurable<int64_t> ccdbNoLaterThan{"ccdbNoLaterThan", std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count(), "latest acceptable timestamp of creation for the object"};
Expand Down Expand Up @@ -238,6 +242,9 @@ struct UccZdc {
registry.add("NchVsThreeParCorr", "MC closure;#it{N}_{ch} (|#eta| < 0.8, Corrected);#LT[#it{p}_{T}^{(3)}]#GT", kTProfile, {{nBinsNch, minNch, maxNch}});
registry.add("NchVsFourParCorr", "MC closure;#it{N}_{ch} (|#eta| < 0.8, Corrected);#LT[#it{p}_{T}^{(4)}]#GT", kTProfile, {{nBinsNch, minNch, maxNch}});
// Corrections
registry.add("NchRec", "Corrections;#it{N}_{ch} (|#eta| < 0.8);Entries;", kTH1F, {{nBinsNch, minNch, maxNch}});
registry.add("NchTrue", "Corrections;#it{N}_{ch} (|#eta| < 0.8);Entries;", kTH1F, {{nBinsNch, minNch, maxNch}});

registry.add("zPosMC", "Filled at MC closure + Corrections;;Entries;", kTH1F, {axisZpos});
registry.add("hEventCounterMC", "Event counter", kTH1F, {axisEvent});
registry.add("nRecColvsCent", "", kTH2F, {{6, -0.5, 5.5}, {{axisCent}}});
Expand Down Expand Up @@ -292,8 +299,11 @@ struct UccZdc {

LOG(info) << "\tccdbNoLaterThan=" << ccdbNoLaterThan.value;
LOG(info) << "\tapplyEff=" << applyEff.value;
LOG(info) << "\tpaTH=" << paTH.value;
LOG(info) << "\tcorrectNch=" << correctNch.value;
LOG(info) << "\tpaTHEff=" << paTHEff.value;
LOG(info) << "\tpaTHFD=" << paTHFD.value;
LOG(info) << "\tuseMidRapNchSel=" << useMidRapNchSel.value;
LOG(info) << "\tnSigmaNchCut=" << nSigmaNchCut.value;
LOG(info) << "\tpaTHmeanNch=" << paTHmeanNch.value;
LOG(info) << "\tpaTHsigmaNch=" << paTHsigmaNch.value;
LOG(info) << "\tminPt=" << minPt.value;
Expand Down Expand Up @@ -681,48 +691,55 @@ struct UccZdc {
}
}

// Skip event based on number of Nch sigmas
if (!skipEvent) {
return;
}

auto efficiency = ccdb->getForTimeStamp<TH1F>(paTH.value, foundBC.timestamp());
// auto efficiency = ccdb->getForRun<TH1F>(paTH.value, foundBC.runNumber());
if (!efficiency) {
auto efficiency = ccdb->getForTimeStamp<TH1F>(paTHEff.value, foundBC.timestamp());
auto fd = ccdb->getForTimeStamp<TH1F>(paTHFD.value, foundBC.timestamp());
if (!efficiency || !fd) {
return;
}

std::vector<float> pTs;
std::vector<float> wIs;
// Calculates the event weight, W_k
std::vector<float> vecFD;
std::vector<float> vecOneOverEff;

// Calculates the Nch multiplicity
for (const auto& track : tracks) {
// Track Selection
if (!track.isGlobalTrack()) {
continue;
}
if ((track.pt() < minPt) || (track.pt() > maxPtSpectra)) {
if ((track.pt() < minPt) || (track.pt() > maxPt)) {
continue;
}

float pt{track.pt()};
double weight{1.};
float effValue{1.0};
if (applyEff) {
weight = efficiency->GetBinContent(efficiency->FindBin(pt));
effValue = efficiency->GetBinContent(efficiency->FindBin(pt));
}
if (weight > 0.) {
pTs.emplace_back(pt);
wIs.emplace_back(weight);
if (effValue > 0.) {
vecOneOverEff.emplace_back(1. / effValue);
}
}

double p1, p2, p3, p4, w1, w2, w3, w4;
p1 = p2 = p3 = p4 = w1 = w2 = w3 = w4 = 0.0;
getPTpowers(pTs, wIs, p1, w1, p2, w2, p3, w3, p4, w4);
const double nch{static_cast<double>(pTs.size())};
if (nch < minNchSel) {
double nchMult{0.};
nchMult = std::accumulate(vecOneOverEff.begin(), vecOneOverEff.end(), 0);
if (!applyEff)
nchMult = static_cast<double>(glbTracks);
if (applyEff && !correctNch)
nchMult = static_cast<double>(glbTracks);
if (nchMult < minNchSel) {
return;
}

// To calculate event-averaged <pt>
// Fill vectors for [pT] measurement
pTs.clear();
vecFD.clear();
vecOneOverEff.clear();
for (const auto& track : tracks) {
// Track Selection
if (!track.isGlobalTrack()) {
Expand All @@ -731,9 +748,27 @@ struct UccZdc {
if ((track.pt() < minPt) || (track.pt() > maxPtSpectra)) {
continue;
}
registry.fill(HIST("NchVsZNVsPt"), w1, sumZNs, track.pt());

float pt{track.pt()};
float effValue{1.};
float fdValue{1.};
if (applyEff) {
effValue = efficiency->GetBinContent(efficiency->FindBin(pt));
fdValue = fd->GetBinContent(fd->FindBin(pt));
}
if ((effValue > 0.) && (fdValue > 0.)) {
pTs.emplace_back(pt);
vecOneOverEff.emplace_back(1. / effValue);
vecFD.emplace_back(fdValue);
}
// To calculate event-averaged <pt>
registry.fill(HIST("NchVsZNVsPt"), nchMult, sumZNs, track.pt());
}

double p1, p2, p3, p4, w1, w2, w3, w4;
p1 = p2 = p3 = p4 = w1 = w2 = w3 = w4 = 0.0;
getPTpowers(pTs, vecOneOverEff, vecFD, p1, w1, p2, w2, p3, w3, p4, w4);

// EbE one-particle pT correlation
double oneParCorr{p1 / w1};

Expand All @@ -752,20 +787,20 @@ struct UccZdc {
double numFourParCorr{std::pow(p1, 4.) - 6. * p2 * std::pow(p1, 2.) + 3. * std::pow(p2, 2.) + 8 * p3 * p1 - 6. * p4};
double fourParCorr{numFourParCorr / denFourParCorr};

registry.fill(HIST("Nch"), w1);
registry.fill(HIST("Nch"), nchMult);
registry.fill(HIST("ZNamp"), sumZNs);
registry.fill(HIST("NchVsZN"), w1, sumZNs);
registry.fill(HIST("NchVsZP"), w1, sumZPs);
registry.fill(HIST("NchVsZN"), nchMult, sumZNs);
registry.fill(HIST("NchVsZP"), nchMult, sumZPs);
registry.fill(HIST("NITSTacksVsZN"), itsTracks, sumZNs);
registry.fill(HIST("NITSTacksVsZP"), itsTracks, sumZPs);
registry.fill(HIST("T0MVsZN"), normT0M, sumZNs);
registry.fill(HIST("T0MVsZP"), normT0M, sumZPs);
registry.fill(HIST("NchUncorrected"), glbTracks);
registry.fill(HIST("NchVsOneParCorr"), w1, oneParCorr, w1);
registry.fill(HIST("NchVsOneParCorrVsZN"), w1, sumZNs, oneParCorr, w1);
registry.fill(HIST("NchVsTwoParCorrVsZN"), w1, sumZNs, twoParCorr, denTwoParCorr);
registry.fill(HIST("NchVsThreeParCorrVsZN"), w1, sumZNs, threeParCorr, denThreeParCorr);
registry.fill(HIST("NchVsFourParCorrVsZN"), w1, sumZNs, fourParCorr, denFourParCorr);
registry.fill(HIST("NchVsOneParCorr"), nchMult, oneParCorr, w1);
registry.fill(HIST("NchVsOneParCorrVsZN"), nchMult, sumZNs, oneParCorr, w1);
registry.fill(HIST("NchVsTwoParCorrVsZN"), nchMult, sumZNs, twoParCorr, denTwoParCorr);
registry.fill(HIST("NchVsThreeParCorrVsZN"), nchMult, sumZNs, threeParCorr, denThreeParCorr);
registry.fill(HIST("NchVsFourParCorrVsZN"), nchMult, sumZNs, fourParCorr, denFourParCorr);
}
PROCESS_SWITCH(UccZdc, processZdcCollAss, "Process ZDC W/Coll Ass.", true);

Expand All @@ -774,7 +809,6 @@ struct UccZdc {
TRandom* randPointer = new TRandom();
void processMCclosure(aod::McCollisions::iterator const& mccollision, soa::SmallGroups<o2::aod::SimCollisions> const& collisions, o2::aod::BCsRun3 const& /*bcs*/, aod::McParticles const& mcParticles, TheFilteredSimTracks const& simTracks)
{

float rndNum = randPointer->Uniform(0.0, 1.0);
registry.fill(HIST("RandomNumber"), rndNum);

Expand Down Expand Up @@ -809,14 +843,17 @@ struct UccZdc {

// To use run-by-run efficiency
const auto& foundBC = collision.foundBC_as<o2::aod::BCsRun3>();
// auto efficiency = ccdb->getForTimeStamp<TH1F>(paTH.value, foundBC.timestamp());
auto efficiency = ccdb->getForRun<TH1F>(paTH.value, foundBC.runNumber());
if (!efficiency) {
continue;
auto efficiency = ccdb->getForTimeStamp<TH1F>(paTHEff.value, foundBC.timestamp());
auto fd = ccdb->getForTimeStamp<TH1F>(paTHFD.value, foundBC.timestamp());
if (!efficiency || !fd) {
return;
}

int nchRaw{0};
std::vector<float> pTs;
std::vector<float> wIs;
std::vector<float> vecFD;
std::vector<float> vecOneOverEff;
// std::vector<float> wIs;
const auto& groupedTracks{simTracks.sliceBy(perCollision, collision.globalIndex())};
// Calculates the event weight, W_k
for (const auto& track : groupedTracks) {
Expand All @@ -826,22 +863,29 @@ struct UccZdc {
}

float pt{track.pt()};
double weight{efficiency->GetBinContent(efficiency->FindBin(pt))};
if (!(weight > 0.)) {
continue;
float effValue{1.};
float fdValue{1.};
nchRaw++;
if (applyEff) {
effValue = efficiency->GetBinContent(efficiency->FindBin(pt));
fdValue = fd->GetBinContent(fd->FindBin(pt));
}
if ((effValue > 0.) && (fdValue > 0.)) {
pTs.emplace_back(pt);
vecOneOverEff.emplace_back(1. / effValue);
vecFD.emplace_back(fdValue);
}
pTs.emplace_back(pt);
wIs.emplace_back(weight);
}

const double nch{static_cast<double>(pTs.size())};
if (nch < minNchSel) {
continue;
double nchMult{0.};
nchMult = std::accumulate(vecOneOverEff.begin(), vecOneOverEff.end(), 0);
if (nchMult < minNchSel) {
return;
}

double p1, p2, p3, p4, w1, w2, w3, w4;
p1 = p2 = p3 = p4 = w1 = w2 = w3 = w4 = 0.0;
getPTpowers(pTs, wIs, p1, w1, p2, w2, p3, w3, p4, w4);
getPTpowers(pTs, vecOneOverEff, vecFD, p1, w1, p2, w2, p3, w3, p4, w4);

const double denTwoParCorr{std::pow(w1, 2.) - w2};
const double numTwoParCorr{std::pow(p1, 2.) - p2};
Expand All @@ -855,16 +899,18 @@ struct UccZdc {
const double threeParCorr{numThreeParCorr / denThreeParCorr};
const double fourParCorr{numFourParCorr / denFourParCorr};

registry.fill(HIST("Nch"), w1);
registry.fill(HIST("NchUncorrected"), nch);
registry.fill(HIST("NchVsOneParCorr"), w1, oneParCorr, w1);
registry.fill(HIST("NchVsTwoParCorr"), w1, twoParCorr, denTwoParCorr);
registry.fill(HIST("NchVsThreeParCorr"), w1, threeParCorr, denThreeParCorr);
registry.fill(HIST("NchVsFourParCorr"), w1, fourParCorr, denFourParCorr);
registry.fill(HIST("Nch"), nchMult);
registry.fill(HIST("NchUncorrected"), nchRaw);
registry.fill(HIST("NchVsOneParCorr"), nchMult, oneParCorr, w1);
registry.fill(HIST("NchVsTwoParCorr"), nchMult, twoParCorr, denTwoParCorr);
registry.fill(HIST("NchVsThreeParCorr"), nchMult, threeParCorr, denThreeParCorr);
registry.fill(HIST("NchVsFourParCorr"), nchMult, fourParCorr, denFourParCorr);

//--------------------------- Generated MC ---------------------------
std::vector<float> pTsMC;
std::vector<float> wIsMC;
std::vector<float> vecFullEff;
std::vector<float> vecFDEqualOne;

// Calculates the event weight, W_k
for (const auto& particle : mcParticles) {
if (particle.eta() < minEta || particle.eta() > maxEta) {
Expand All @@ -879,17 +925,19 @@ struct UccZdc {

float pt{particle.pt()};
pTsMC.emplace_back(pt);
wIsMC.emplace_back(1.);
vecFullEff.emplace_back(1.);
vecFDEqualOne.emplace_back(1.);
}

const double nchMC{static_cast<double>(pTsMC.size())};
double nchMC{0};
nchMult = std::accumulate(vecFullEff.begin(), vecFullEff.end(), 0);
if (nchMC < minNchSel) {
continue;
}

double p1MC, p2MC, p3MC, p4MC, w1MC, w2MC, w3MC, w4MC;
p1MC = p2MC = p3MC = p4MC = w1MC = w2MC = w3MC = w4MC = 0.0;
getPTpowers(pTsMC, wIsMC, p1MC, w1MC, p2MC, w2MC, p3MC, w3MC, p4MC, w4MC);
getPTpowers(pTsMC, vecFullEff, vecFDEqualOne, p1MC, w1MC, p2MC, w2MC, p3MC, w3MC, p4MC, w4MC);

const double denTwoParCorrMC{std::pow(w1MC, 2.) - w2MC};
const double numTwoParCorrMC{std::pow(p1MC, 2.) - p2MC};
Expand All @@ -911,6 +959,8 @@ struct UccZdc {
} else { // Correction with the remaining half of the sample
registry.fill(HIST("EvtsDivided"), 1);
//----- MC reconstructed -----//
int nchTrue{0};
int nchRec{0};
const auto& groupedTracks{simTracks.sliceBy(perCollision, collision.globalIndex())};
for (const auto& track : groupedTracks) {
// Track Selection
Expand All @@ -932,6 +982,7 @@ struct UccZdc {
continue;
}

nchRec++;
registry.fill(HIST("Pt_ch"), cent, track.pt());
if (particle.pdgCode() == PDG_t::kPiPlus || particle.pdgCode() == PDG_t::kPiMinus) {
registry.fill(HIST("Pt_pi"), cent, track.pt());
Expand Down Expand Up @@ -960,6 +1011,7 @@ struct UccZdc {
continue;
}

nchTrue++;
registry.fill(HIST("PtMC_ch"), cent, particle.pt());
if (particle.pdgCode() == PDG_t::kPiPlus || particle.pdgCode() == PDG_t::kPiMinus) { // pion
registry.fill(HIST("PtMC_pi"), cent, particle.pt());
Expand All @@ -975,18 +1027,23 @@ struct UccZdc {
registry.fill(HIST("PtMC_re"), cent, particle.pt());
}
}

registry.fill(HIST("NchRec"), nchRec);
registry.fill(HIST("NchTrue"), nchTrue);
} // Half of statistics for corrections
} // Collisions
}
PROCESS_SWITCH(UccZdc, processMCclosure, "Process MC closure", false);

template <typename T, typename U>
void getPTpowers(const T& pTs, const T& wIs, U& pOne, U& wOne, U& pTwo, U& wTwo, U& pThree, U& wThree, U& pFour, U& wFour)
void getPTpowers(const T& pTs, const T& vecOneOverEff, const T& vecFD, U& pOne, U& wOne, U& pTwo, U& wTwo, U& pThree, U& wThree, U& pFour, U& wFour)
{
pOne = wOne = pTwo = wTwo = pThree = wThree = pFour = wFour = 0.;
for (std::size_t i = 0; i < pTs.size(); ++i) {
const float pTi{pTs.at(i)};
const float wEighti{wIs.at(i)};
const float eFFi{vecOneOverEff.at(i)};
const float fDi{vecFD.at(i)};
const float wEighti{eFFi * fDi};
pOne += wEighti * pTi;
wOne += wEighti;
pTwo += std::pow(wEighti * pTi, 2.);
Expand Down
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