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[PWGLF] Use Nch-dependent feed down to improve MC closure #11882

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Merged
abmodak merged 1 commit into from
Jul 2, 2025
Merged

[PWGLF] Use Nch-dependent feed down to improve MC closure #11882

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57 changes: 37 additions & 20 deletions PWGLF/Tasks/GlobalEventProperties/uccZdc.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,7 @@ struct UccZdc {

static constexpr float kCollEnergy{2.68};
static constexpr float kZero{0.};
static constexpr float kOne{1.};
static constexpr float kMinCharge{3.f};

// Configurables Event Selection
Expand All @@ -86,6 +87,7 @@ struct UccZdc {
Configurable<bool> applyEff{"applyEff", true, "Apply track-by-track efficiency correction"};
Configurable<bool> applyFD{"applyFD", false, "Apply track-by-track feed down correction"};
Configurable<bool> correctNch{"correctNch", true, "Correct also Nch"};
Configurable<bool> skipRecoColGTOne{"skipRecoColGTOne", true, "Remove collisions if reconstructed more than once"};

// Event selection
Configurable<float> posZcut{"posZcut", +10.0, "z-vertex position cut"};
Expand Down Expand Up @@ -167,8 +169,6 @@ struct UccZdc {
HistogramRegistry registry{"registry", {}, OutputObjHandlingPolicy::AnalysisObject, true, true};
Service<ccdb::BasicCCDBManager> ccdb;

TH1F* fd = nullptr;

void init(InitContext const&)
{
// define axes you want to use
Expand Down Expand Up @@ -322,10 +322,10 @@ struct UccZdc {
// This avoids that users can replace objects **while** a train is running
ccdb->setCreatedNotAfter(ccdbNoLaterThan.value);
// Feed Down is the same for all runs -> use a global object
fd = ccdb->getForTimeStamp<TH1F>(paTHFD.value, ccdbNoLaterThan.value);
if (!fd) {
LOGF(fatal, "Feed Down object not found!");
}
// fd = ccdb->getForTimeStamp<TH1F>(paTHFD.value,ccdbNoLaterThan.value);
// if (!fd) {
// LOGF(fatal, "Feed Down object not found!");
// }
}

template <typename CheckCol>
Expand Down Expand Up @@ -709,10 +709,15 @@ struct UccZdc {
return;
}

auto feedDown = ccdb->getForTimeStamp<TH2F>(paTHFD.value, foundBC.timestamp());
if (!feedDown) {
return;
}

double nchMult{0.};
std::vector<float> pTs;
std::vector<float> vecFD;
std::vector<float> vecEff;
std::vector<float> vecOneOverEff;

// Calculates the Nch multiplicity
for (const auto& track : tracks) {
Expand All @@ -727,17 +732,19 @@ struct UccZdc {
float pt{track.pt()};
int foundNchBin{efficiency->GetXaxis()->FindBin(glbTracks)};
int foundPtBin{efficiency->GetYaxis()->FindBin(pt)};
float effValue{1.0};
float effValue{1.};
float fdValue{1.};
if (applyEff) {
effValue = efficiency->GetBinContent(foundNchBin, foundPtBin);
}
if (effValue > 0.) {
vecOneOverEff.emplace_back(1. / effValue);
if (applyFD) {
fdValue = feedDown->GetBinContent(foundNchBin, foundPtBin);
}
if ((effValue > 0.) && (fdValue > 0.)) {
nchMult += (std::pow(effValue, -1.) * fdValue);
}
}

double nchMult{0.};
nchMult = std::accumulate(vecOneOverEff.begin(), vecOneOverEff.end(), 0);
if (!applyEff)
nchMult = static_cast<double>(glbTracks);
if (applyEff && !correctNch)
Expand Down Expand Up @@ -766,7 +773,7 @@ struct UccZdc {
float fdValue{1.};
if (applyEff) {
effValue = efficiency->GetBinContent(foundNchBin, foundPtBin);
fdValue = fd->GetBinContent(fd->FindBin(pt));
fdValue = feedDown->GetBinContent(foundNchBin, foundPtBin);
}
if (applyEff && !applyFD) {
fdValue = 1.0;
Expand Down Expand Up @@ -861,12 +868,18 @@ struct UccZdc {

double nchRaw{0.};
double nchMult{0.};
double nchMC{0};
double normT0M{0.};
normT0M = (aT0A + aT0C) / 100.;

registry.fill(HIST("zPos"), collision.posZ());
registry.fill(HIST("zPosMC"), mccollision.posZ());
registry.fill(HIST("hEventCounterMC"), EvCutLabel::VtxZ);

if (skipRecoColGTOne && (collisions.size() > kOne)) {
continue;
}

registry.fill(HIST("nRecColvsCent"), collisions.size(), collision.centFT0C());

const auto& cent{collision.centFT0C()};
Expand All @@ -882,11 +895,15 @@ struct UccZdc {
return;
}

auto feedDown = ccdb->getForTimeStamp<TH2F>(paTHFD.value, foundBC.timestamp());
if (!feedDown) {
return;
}

std::vector<double> pTs;
std::vector<double> vecFD;
std::vector<double> vecEff;
std::vector<double> vecOneOverEffXFD;
// std::vector<float> wIs;

const auto& groupedTracks{simTracks.sliceBy(perCollision, collision.globalIndex())};

// Calculates the event's Nch to evaluate the efficiency
Expand Down Expand Up @@ -946,16 +963,16 @@ struct UccZdc {

if (applyEff) {
effValue = efficiency->GetBinContent(foundNchBin, foundPtBin);
fdValue = fd->GetBinContent(fd->FindBin(pt));
fdValue = feedDown->GetBinContent(foundNchBin, foundPtBin);
}
if ((effValue > 0.) && (fdValue > 0.)) {
pTs.emplace_back(pt);
vecEff.emplace_back(effValue);
vecFD.emplace_back(fdValue);
vecOneOverEffXFD.emplace_back(fdValue / effValue);
nchMult += (std::pow(effValue, -1.0) * fdValue);
}
}
nchMult = std::accumulate(vecOneOverEffXFD.begin(), vecOneOverEffXFD.end(), 0);

if (nchMult < minNchSel) {
return;
}
Expand Down Expand Up @@ -1019,13 +1036,13 @@ struct UccZdc {
pTsMC.emplace_back(pt);
vecFullEff.emplace_back(1.);
vecFDEqualOne.emplace_back(1.);
nchMC++;
}

double nchMC{0};
nchMC = std::accumulate(vecFullEff.begin(), vecFullEff.end(), 0);
if (nchMC < minNchSel) {
continue;
}
// printf("nchMult = %f | nchMC = %f | nchMult/nchMc = %f\n",nchMult,nchMC,nchMult/nchMC);

double p1MC, p2MC, p3MC, p4MC, w1MC, w2MC, w3MC, w4MC;
p1MC = p2MC = p3MC = p4MC = w1MC = w2MC = w3MC = w4MC = 0.0;
Expand Down
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