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[Common] Add time dependency study to centrality task #11896

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ddobrigk merged 3 commits into from
Jul 3, 2025
Merged

[Common] Add time dependency study to centrality task #11896

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Add time dependency study
jesgum Jul 3, 2025
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jesgum Jul 3, 2025
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54 changes: 45 additions & 9 deletions Common/Tasks/centralityStudy.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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[doc/file] 

Provide mandatory file documentation.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
Expand All @@ -8,19 +8,23 @@
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
//

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// This task does dedicated centrality studies for understanding the
// Run 3 Pb-Pb centrality selections in 2023 data. It is compatible with
// derived data.

#include "Framework/runDataProcessing.h"
#include "Framework/AnalysisTask.h"
#include "Framework/AnalysisDataModel.h"
#include "Common/DataModel/McCollisionExtra.h"
#include "Common/DataModel/Multiplicity.h"
#include "Common/DataModel/Centrality.h"
#include "Common/DataModel/EventSelection.h"
#include "Common/DataModel/McCollisionExtra.h"
#include "Common/DataModel/Multiplicity.h"

#include "CCDB/BasicCCDBManager.h"
#include "DataFormatsParameters/GRPECSObject.h"
#include "Framework/AnalysisDataModel.h"
#include "Framework/AnalysisTask.h"
#include "Framework/O2DatabasePDGPlugin.h"
#include "Framework/runDataProcessing.h"

#include "TH1F.h"
#include "TH2F.h"

Expand All @@ -29,16 +33,18 @@

using BCsWithRun3Matchings = soa::Join<aod::BCs, aod::Timestamps, aod::Run3MatchedToBCSparse>;

struct centralityStudy {

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Use UpperCamelCase for names of structs.
// Raw multiplicities
HistogramRegistry histos{"Histos", {}, OutputObjHandlingPolicy::AnalysisObject};
Service<o2::ccdb::BasicCCDBManager> ccdb;

// Configurables
Configurable<bool> do2DPlots{"do2DPlots", true, "0 - no, 1 - yes"};
Configurable<bool> doOccupancyStudyVsCentrality2d{"doOccupancyStudyVsCentrality2d", true, "0 - no, 1 - yes"};
Configurable<bool> doOccupancyStudyVsRawValues2d{"doOccupancyStudyVsRawValues2d", true, "0 - no, 1 - yes"};
Configurable<bool> doOccupancyStudyVsCentrality3d{"doOccupancyStudyVsCentrality3d", false, "0 - no, 1 - yes"};
Configurable<bool> doOccupancyStudyVsRawValues3d{"doOccupancyStudyVsRawValues3d", false, "0 - no, 1 - yes"};
Configurable<bool> doTimeStudies{"doTimeStudies", false, "0 - no, 1 - yes"};
Configurable<bool> doNGlobalTracksVsRawSignals{"doNGlobalTracksVsRawSignals", true, "0 - no, 1 - yes"};
Configurable<bool> applySel8{"applySel8", true, "0 - no, 1 - yes"};
Configurable<bool> applyVtxZ{"applyVtxZ", true, "0 - no, 1 - yes"};
Expand Down Expand Up @@ -113,10 +119,10 @@
ConfigurableAxis axisCentrality{"axisCentrality", {100, 0, 100}, "FT0C percentile"};
ConfigurableAxis axisPVChi2{"axisPVChi2", {300, 0, 30}, "FT0C percentile"};
ConfigurableAxis axisDeltaTime{"axisDeltaTime", {300, 0, 300}, "#Delta time"};
ConfigurableAxis axisDeltaTimestamp{"axisDeltaTimestamp", {1440, 0, 24}, "#Delta timestamp - sor (hours)"};

// For profile Z
ConfigurableAxis axisPVz{"axisPVz", {400, -20.0f, +20.0f}, "PVz (cm)"};

ConfigurableAxis axisZN{"axisZN", {1100, -50.0f, +500.0f}, "ZN"};

void init(InitContext&)
Expand Down Expand Up @@ -227,6 +233,21 @@
histos.add("hFT0COccupancyVsNGlobalTracksVsCentrality", "hFT0COccupancyVsNGlobalTracksVsCentrality", kTH3F, {axisFT0COccupancy, axisMultGlobalTracks, axisCentrality});
}
}

if (doTimeStudies) {
ccdb->setURL("http://alice-ccdb.cern.ch");
ccdb->setCaching(true);
ccdb->setLocalObjectValidityChecking();
ccdb->setFatalWhenNull(false);

histos.add("hFT0AvsTime", "hFT0AvsTime", kTH2F, {axisDeltaTimestamp, axisMultFT0A});
histos.add("hFT0CvsTime", "hFT0CvsTime", kTH2F, {{axisDeltaTimestamp, axisMultFT0C}});
histos.add("hFT0MvsTime", "hFT0MvsTime", kTH2F, {{axisDeltaTimestamp, axisMultFT0M}});
histos.add("hFV0AvsTime", "hFV0AvsTime", kTH2F, {{axisDeltaTimestamp, axisMultFV0A}});
histos.add("hMFTTracksvsTime", "hMFTTracksvsTime", kTH2F, {{axisDeltaTimestamp, axisMultMFTTracks}});
histos.add("hNGlobalVsTime", "hNGlobalVsTime", kTH2F, {{axisDeltaTimestamp, axisMultGlobalTracks}});
histos.add("hNTPVContributorsvsTime", "hNTPVContributorsvsTime", kTH2F, {{axisDeltaTimestamp, axisMultPVContributors}});
}
}

template <typename TCollision>
Expand All @@ -238,7 +259,7 @@
if (applySel8 && !collision.multSel8())
return;
histos.fill(HIST("hCollisionSelection"), 1);
if (applyVtxZ && TMath::Abs(collision.multPVz()) > 10)

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[magic-number] 

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
return;
histos.fill(HIST("hCollisionSelection"), 2);

Expand Down Expand Up @@ -281,7 +302,7 @@

// do this only if information is available
if constexpr (requires { collision.timeToNext(); }) {
float timeToNeighbour = TMath::Min(

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std::abs(collision.timeToNext()),
std::abs(collision.timeToPrevious()));
histos.fill(HIST("hDeltaTimeVsCentrality"), collision.centFT0C(), timeToNeighbour);
Expand Down Expand Up @@ -403,19 +424,34 @@
histos.fill(HIST("hFT0COccupancyVsNGlobalTracksVsCentrality"), collision.ft0cOccupancyInTimeRange(), collision.multNTracksGlobal(), collision.centFT0C());
}
}

if (doTimeStudies && collision.has_multBC()) {
auto multbc = collision.template multBC_as<aod::MultBCs>();
uint64_t bcTimestamp = multbc.timestamp();
o2::parameters::GRPECSObject* grpo = ccdb->getForTimeStamp<o2::parameters::GRPECSObject>("GLO/Config/GRPECS", bcTimestamp);
uint64_t startOfRunTimestamp = grpo->getTimeStart();
float hoursAfterStartOfRun = static_cast<float>(bcTimestamp - startOfRunTimestamp) / 3600000.0;
histos.fill(HIST("hFT0AvsTime"), hoursAfterStartOfRun, collision.multFT0A());
histos.fill(HIST("hFT0CvsTime"), hoursAfterStartOfRun, collision.multFT0C());
histos.fill(HIST("hFT0MvsTime"), hoursAfterStartOfRun, collision.multFT0M());
histos.fill(HIST("hFV0AvsTime"), hoursAfterStartOfRun, collision.multFV0A());
histos.fill(HIST("hMFTTracksvsTime"), hoursAfterStartOfRun, collision.mftNtracks());
histos.fill(HIST("hNGlobalVsTime"), hoursAfterStartOfRun, collision.multNTracksGlobal());
histos.fill(HIST("hNTPVContributorsvsTime"), hoursAfterStartOfRun, collision.multPVTotalContributors());
}
}

void processCollisions(soa::Join<aod::Mults, aod::MFTMults, aod::MultsExtra, aod::MultsGlobal, aod::MultSelections>::iterator const& collision)
void processCollisions(soa::Join<aod::Mults, aod::MFTMults, aod::MultsExtra, aod::MultsGlobal, aod::MultSelections, aod::Mults2BC>::iterator const& collision, aod::MultBCs const&)
{
genericProcessCollision(collision);
}

void processCollisionsWithCentrality(soa::Join<aod::Mults, aod::MFTMults, aod::MultsExtra, aod::MultSelections, aod::CentFT0Cs, aod::MultsGlobal>::iterator const& collision)
void processCollisionsWithCentrality(soa::Join<aod::Mults, aod::MFTMults, aod::MultsExtra, aod::MultSelections, aod::CentFT0Cs, aod::MultsGlobal, aod::Mults2BC>::iterator const& collision, aod::MultBCs const&)
{
genericProcessCollision(collision);
}

void processCollisionsWithCentralityWithNeighbours(soa::Join<aod::Mults, aod::MFTMults, aod::MultsExtra, aod::MultSelections, aod::CentFT0Cs, aod::MultsGlobal, aod::MultNeighs>::iterator const& collision)
void processCollisionsWithCentralityWithNeighbours(soa::Join<aod::Mults, aod::MFTMults, aod::MultsExtra, aod::MultSelections, aod::CentFT0Cs, aod::MultsGlobal, aod::MultNeighs, aod::Mults2BC>::iterator const& collision, aod::MultBCs const&)
{
genericProcessCollision(collision);
}
Expand All @@ -434,10 +470,10 @@
if (selectFV0OrA && !multbc.multFV0OrA())
return;
histos.fill(HIST("hBCSelection"), 3); // FV0OrA
if (vertexZwithT0 < 100.0f) {

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if (!multbc.multFT0PosZValid())
return;
if (TMath::Abs(multbc.multFT0PosZ()) > vertexZwithT0)

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return;
}
histos.fill(HIST("hBCSelection"), 4); // FV0OrA
Expand Down
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