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[PWGCF] Add gain eq to FIT for the long range correlations #13009

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Merged
victor-gonzalez merged 4 commits into from
Sep 17, 2025
Merged

[PWGCF] Add gain eq to FIT for the long range correlations #13009

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Add gain eq to FIT for the long range correlations
joachimckh Sep 17, 2025
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joachimckh Sep 17, 2025
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change C style cast
joachimckh Sep 17, 2025
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Trigger Build
joachimckh Sep 17, 2025
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45 changes: 43 additions & 2 deletions PWGCF/TwoParticleCorrelations/Tasks/longRangeDihadronCor.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@

/// \file longRangeDihadronCor.cxx
/// \brief long range di-hadron correlation for O-O, Pb-Pb collisions
/// \author Zhiyong Lu (zhiyong.lu@cern.ch)
/// \author Zhiyong Lu (zhiyong.lu@cern.ch), Joachim Hansen (joachim.hansen@cern.ch)
/// \since Sep/10/2025

#include "PWGCF/Core/CorrelationContainer.h"
Expand Down Expand Up @@ -150,15 +150,21 @@ struct LongRangeDihadronCor {
ConfigurableAxis axisAmplitudeFt0a{"axisAmplitudeFt0a", {5000, 0, 1000}, "FT0A amplitude"};
ConfigurableAxis axisChannelFt0aAxis{"axisChannelFt0aAxis", {96, 0.0, 96.0}, "FT0A channel"};

Configurable<std::string> cfgGainEqPath{"cfgGainEqPath", "Analysis/EventPlane/GainEq", "CCDB path for gain equalization constants"};
Configurable<int> cfgCorrLevel{"cfgCorrLevel", 1, "calibration step: 0 = no corr, 1 = gain corr"};
ConfigurableAxis cfgaxisFITamp{"cfgaxisFITamp", {1000, 0, 5000}, ""};
AxisSpec axisFit{cfgaxisFITamp, "fit amplitude"};
AxisSpec axisChID = {220, 0, 220};
// make the filters and cuts.
Filter collisionFilter = (nabs(aod::collision::posZ) < cfgCutVtxZ);
Filter trackFilter = (nabs(aod::track::eta) < cfgCutEta) && (aod::track::pt > cfgCutPtMin) && (aod::track::pt < cfgCutPtMax) && ((requireGlobalTrackInFilter()) || (aod::track::isGlobalTrackSDD == (uint8_t) true)) && (aod::track::tpcChi2NCl < cfgCutChi2prTPCcls) && (nabs(aod::track::dcaZ) < cfgCutDCAz);
Filter trackFilter = (nabs(aod::track::eta) < cfgCutEta) && (aod::track::pt > cfgCutPtMin) && (aod::track::pt < cfgCutPtMax) && ((requireGlobalTrackInFilter()) || (aod::track::isGlobalTrackSDD == static_cast<uint8_t>(true))) && (aod::track::tpcChi2NCl < cfgCutChi2prTPCcls) && (nabs(aod::track::dcaZ) < cfgCutDCAz);
using FilteredCollisions = soa::Filtered<soa::Join<aod::Collisions, aod::EvSel, aod::CentFT0Cs, aod::CentFT0CVariant1s, aod::CentFT0Ms, aod::CentFV0As, aod::Mults>>;
using FilteredTracks = soa::Filtered<soa::Join<aod::Tracks, aod::TrackSelection, aod::TracksExtra, aod::TracksDCA>>;

// FT0 geometry
o2::ft0::Geometry ft0Det;
std::vector<o2::detectors::AlignParam>* offsetFT0;
std::vector<float> cstFT0RelGain{};

// Corrections
TH3D* mEfficiency = nullptr;
Expand Down Expand Up @@ -272,6 +278,8 @@ struct LongRangeDihadronCor {
registry.add("Trig_hist", "", {HistType::kTHnSparseF, {{axisSample, axisVertex, axisPtTrigger}}});
registry.add("Assoc_amp_same", "", {HistType::kTH2D, {axisChannelFt0aAxis, axisAmplitudeFt0a}});
registry.add("Assoc_amp_mixed", "", {HistType::kTH2D, {axisChannelFt0aAxis, axisAmplitudeFt0a}});
registry.add("FT0Amp", "", {HistType::kTH2F, {axisChID, axisFit}});
registry.add("FT0AmpCorr", "", {HistType::kTH2F, {axisChID, axisFit}});
}

registry.add("eventcount", "bin", {HistType::kTH1F, {{4, 0, 4, "bin"}}}); // histogram to see how many events are in the same and mixed event
Expand Down Expand Up @@ -354,6 +362,32 @@ struct LongRangeDihadronCor {
}
}

void loadGain(aod::BCsWithTimestamps::iterator const& bc)
{
cstFT0RelGain.clear();
cstFT0RelGain = {};
std::string fullPath;

auto timestamp = bc.timestamp();
constexpr int ChannelsFT0 = 208;
if (cfgCorrLevel == 0) {
for (auto i{0u}; i < ChannelsFT0; i++) {
cstFT0RelGain.push_back(1.);
}
} else {
fullPath = cfgGainEqPath;
fullPath += "/FT0";
const auto objft0Gain = ccdb->getForTimeStamp<std::vector<float>>(fullPath, timestamp);
if (!objft0Gain) {
for (auto i{0u}; i < ChannelsFT0; i++) {
cstFT0RelGain.push_back(1.);
}
} else {
cstFT0RelGain = *(objft0Gain);
}
}
}

void loadCorrection(uint64_t timestamp)
{
if (correctionsLoaded) {
Expand Down Expand Up @@ -434,15 +468,21 @@ struct LongRangeDihadronCor {
void getChannel(TFT0s const& ft0, std::size_t const& iCh, int& id, float& ampl)
{
int switchCor = cfgSwitchCor;
int rID{0};
if (switchCor == kFT0C) {
id = ft0.channelC()[iCh];
rID = id + 96;
ampl = ft0.amplitudeC()[iCh];
} else if (switchCor == kFT0A) {
id = ft0.channelA()[iCh];
rID = id;
ampl = ft0.amplitudeA()[iCh];
} else {
LOGF(fatal, "Cor Index %d out of range", switchCor);
}
registry.fill(HIST("FT0Amp"), rID, ampl);
ampl = ampl / cstFT0RelGain[iCh];
registry.fill(HIST("FT0AmpCorr"), rID, ampl);
}

template <CorrelationContainer::CFStep step, typename TTracks, typename TFT0s>
Expand Down Expand Up @@ -613,6 +653,7 @@ struct LongRangeDihadronCor {
if (!collision.has_foundFT0())
return;
loadAlignParam(bc.timestamp());
loadGain(bc);
loadCorrection(bc.timestamp());
if (!cfgCentTableUnavailable) {
getCentralityWeight(weightCent, cent);
Expand Down
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