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Merged
wenyaCern merged 3 commits into from
Jul 30, 2026
+103 −9
Merged

[PWGCF] Added multiplicity study & pt correlations #17261

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96ef627
[PWGCF] Added multiplicity study & pt correlations
Jul 30, 2026
3fe44f3
Please consider the following formatting changes
alibuild Jul 30, 2026
87da907
Merge pull request #27 from alibuild/alibot-cleanup-17261
MaximVirta Jul 30, 2026
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112 changes: 103 additions & 9 deletions PWGCF/GenericFramework/Tasks/flowGfwV02.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -92,7 +92,7 @@
float phiup = o2::constants::math::TwoPI;
int nchbins = 300;
float nchlow = 0;
float nchup = 3000;
float nchup = 300;
std::vector<double> centbinning(90);
int nBootstrap = 10;
std::vector<std::pair<double, double>> etagapsPtPt;
Expand All @@ -104,6 +104,7 @@
} // namespace o2::analysis::gfw

struct FlowGfwV02 {

O2_DEFINE_CONFIGURABLE(cfgNbootstrap, int, 10, "Number of subsamples")
O2_DEFINE_CONFIGURABLE(cfgMpar, int, 4, "Highest order of pt-pt correlations")
O2_DEFINE_CONFIGURABLE(cfgCentEstimator, int, 0, "0:FT0C; 1:FT0CVariant1; 2:FT0M; 3:FT0A")
Expand All @@ -124,6 +125,7 @@
O2_DEFINE_CONFIGURABLE(cfgNormalizeByCharged, bool, true, "Enable or disable the normalization by charged particles");
O2_DEFINE_CONFIGURABLE(cfgConsistentEventFlag, int, 15, "Flag for consistent event selection");
O2_DEFINE_CONFIGURABLE(cfgMultCut, bool, true, "Use additional event cut on mult correlations");
O2_DEFINE_CONFIGURABLE(cfgUseV0, bool, false, "Use V0 analysis");

// Event selection cuts
struct : ConfigurableGroup {
Expand All @@ -139,6 +141,16 @@
O2_DEFINE_CONFIGURABLE(cfgIsVertexITSTPC, bool, true, "kIsVertexITSTPC - Selects collisions with at least one ITS-TPC track");
} cfgEventCutFlags;

// Event selection cuts
struct : ConfigurableGroup {
O2_DEFINE_CONFIGURABLE(cfgEtaSubAMin, float, -0.8, "Minimum eta for subevent A");
O2_DEFINE_CONFIGURABLE(cfgEtaSubAMax, float, -0.5, "Maximum eta for subevent A");
O2_DEFINE_CONFIGURABLE(cfgEtaSubBMin, float, 0.5, "Minimum eta for subevent B");
O2_DEFINE_CONFIGURABLE(cfgEtaSubBMax, float, 0.8, "Maximum eta for subevent B");
O2_DEFINE_CONFIGURABLE(cfgEtaSubCMin, float, -0.4, "Minimum eta for subevent C");
O2_DEFINE_CONFIGURABLE(cfgEtaSubCMax, float, 0.4, "Maximum eta for subevent C");
} cfgSubeventCuts;

struct : ConfigurableGroup {
Configurable<std::vector<double>> cfgMultGlobalCutPars{"cfgMultGlobalCutPars", std::vector<double>{2272.16, -76.6932, 1.01204, -0.00631545, 1.59868e-05, 136.336, -4.97006, 0.121199, -0.0015921, 7.66197e-06}, "Global vs FT0C multiplicity cut parameter values"};
Configurable<std::vector<double>> cfgMultPVCutPars{"cfgMultPVCutPars", std::vector<double>{3074.43, -106.192, 1.46176, -0.00968364, 2.61923e-05, 182.128, -7.43492, 0.193901, -0.00256715, 1.22594e-05}, "PV vs FT0C multiplicity cut parameter values"};
Expand Down Expand Up @@ -253,6 +265,8 @@
std::array<float, 6> itsNsigmaCut;
std::array<float, 6> tpcNsigmaCut;
std::array<std::unique_ptr<TH1D>, 4> hPtMid{};
std::array<std::unique_ptr<TH1D>, 4> hPtForward{};
std::array<std::unique_ptr<TH1D>, 4> hPtBackward{};
};
PIDState pidStates;

Expand All @@ -275,7 +289,8 @@
PidCharged = 0,
PidPions,
PidKaons,
PidProtons
PidProtons,
PidTotal
};
enum PiKpArrayIndex {
IndPionUp = 0,
Expand Down Expand Up @@ -378,6 +393,24 @@
pidStates.hPtMid[PidKaons]->SetDirectory(nullptr);
pidStates.hPtMid[PidProtons]->SetDirectory(nullptr);

pidStates.hPtForward[PidCharged] = std::make_unique<TH1D>("hPtForward_charged", "hPtForward_charged", o2::analysis::gfw::ptbinning.size() - 1, &o2::analysis::gfw::ptbinning[0]);
pidStates.hPtForward[PidPions] = std::make_unique<TH1D>("hPtForward_pions", "hPtForward_pions", o2::analysis::gfw::ptbinning.size() - 1, &o2::analysis::gfw::ptbinning[0]);
pidStates.hPtForward[PidKaons] = std::make_unique<TH1D>("hPtForward_kaons", "hPtForward_kaons", o2::analysis::gfw::ptbinning.size() - 1, &o2::analysis::gfw::ptbinning[0]);
pidStates.hPtForward[PidProtons] = std::make_unique<TH1D>("hPtForward_protons", "hPtForward_protons", o2::analysis::gfw::ptbinning.size() - 1, &o2::analysis::gfw::ptbinning[0]);
pidStates.hPtForward[PidCharged]->SetDirectory(nullptr);
pidStates.hPtForward[PidPions]->SetDirectory(nullptr);
pidStates.hPtForward[PidKaons]->SetDirectory(nullptr);
pidStates.hPtForward[PidProtons]->SetDirectory(nullptr);

pidStates.hPtBackward[PidCharged] = std::make_unique<TH1D>("hPtBackward_charged", "hPtBackward_charged", o2::analysis::gfw::ptbinning.size() - 1, &o2::analysis::gfw::ptbinning[0]);
pidStates.hPtBackward[PidPions] = std::make_unique<TH1D>("hPtBackward_pions", "hPtBackward_pions", o2::analysis::gfw::ptbinning.size() - 1, &o2::analysis::gfw::ptbinning[0]);
pidStates.hPtBackward[PidKaons] = std::make_unique<TH1D>("hPtBackward_kaons", "hPtBackward_kaons", o2::analysis::gfw::ptbinning.size() - 1, &o2::analysis::gfw::ptbinning[0]);
pidStates.hPtBackward[PidProtons] = std::make_unique<TH1D>("hPtBackward_protons", "hPtBackward_protons", o2::analysis::gfw::ptbinning.size() - 1, &o2::analysis::gfw::ptbinning[0]);
pidStates.hPtBackward[PidCharged]->SetDirectory(nullptr);
pidStates.hPtBackward[PidPions]->SetDirectory(nullptr);
pidStates.hPtBackward[PidKaons]->SetDirectory(nullptr);
pidStates.hPtBackward[PidProtons]->SetDirectory(nullptr);

AxisSpec phiAxis = {o2::analysis::gfw::phibins, o2::analysis::gfw::philow, o2::analysis::gfw::phiup, "#phi"};
AxisSpec etaAxis = {o2::analysis::gfw::etabins, -cfgTrackCuts.cfgEtaMax, cfgTrackCuts.cfgEtaMax, "#eta"};
AxisSpec vtxAxis = {o2::analysis::gfw::vtxZbins, -cfgEventCuts.cfgZvtxMax, cfgEventCuts.cfgZvtxMax, "Vtx_{z} (cm)"};
Expand All @@ -398,9 +431,19 @@
AxisSpec multpvAxis = {600, 0, 600, "N_{ch} (PV)"};
AxisSpec dcaZAxis = {200, -2, 2, "DCA_{z} (cm)"};
AxisSpec dcaXYAxis = {200, -0.5, 0.5, "DCA_{xy} (cm)"};
AxisSpec pidAxis = {4, -0.5, 3.5, "PID"}; // 0 = not identified, 1 = pion, 2 = kaon, 3 = proton

registry.add("v02pt", "", {HistType::kTProfile2D, {ptAxis, centAxis}});
registry.add("nchMid", "", {HistType::kTProfile2D, {ptAxis, centAxis}});
registry.add("nchMid", "", {HistType::kTProfile3D, {ptAxis, centAxis, nchAxis}});
registry.add("v02centmult", "", {HistType::kTProfile2D, {centAxis, nchAxis}});

registry.add("analysis/v0AB", "", {HistType::kTProfile3D, {pidAxis, ptAxis, centAxis}});
registry.add("analysis/v0BA", "", {HistType::kTProfile3D, {pidAxis, ptAxis, centAxis}});
registry.add("analysis/nchA", "", {HistType::kTProfile3D, {pidAxis, ptAxis, centAxis}});
registry.add("analysis/nchB", "", {HistType::kTProfile3D, {pidAxis, ptAxis, centAxis}});
registry.add("analysis/ptA", "", {HistType::kTProfile3D, {pidAxis, centAxis, nchAxis}});
registry.add("analysis/ptB", "", {HistType::kTProfile3D, {pidAxis, centAxis, nchAxis}});
registry.add("analysis/ptAB", "", {HistType::kTProfile3D, {pidAxis, centAxis, nchAxis}});

ccdb->setURL("http://alice-ccdb.cern.ch");
ccdb->setCaching(true);
Expand Down Expand Up @@ -614,7 +657,7 @@
}
if (cfgPIDEfficiency) {
const std::array<std::string, 4> pidStrings = {"ch", "pi", "ka", "pr"};
for (int i = 1; i < 4; i++) {
for (int i = 1; i < PidTotal; i++) {

cfg.mEfficiency[i] = ccdb->getForTimeStamp<TH1D>(cfgEfficiency.value + pidStrings[i], timestamp);
if (cfg.mEfficiency[i] == nullptr) {
Expand Down Expand Up @@ -806,7 +849,7 @@
}

template <DataType dt>
void fillOutputContainers(const float& centmult, const double& rndm, const int& /*run*/ = 0)
void fillOutputContainers(const float& centmult, const int& multiplicity, const double& rndm, const int& /*run*/ = 0)
{
for (uint l_ind = 0; l_ind < corrconfigs.size(); ++l_ind) {
if (!corrconfigs.at(l_ind).pTDif) {
Expand Down Expand Up @@ -841,11 +884,37 @@
int normIndex = (cfgNormalizeByCharged) ? PidCharged : pidInd; // Configured to normalize by charged particles or the selected particle
if (pidStates.hPtMid[normIndex]->Integral() > 0) {
ptFraction = pidStates.hPtMid[pidInd]->GetBinContent(i) / pidStates.hPtMid[normIndex]->Integral();
if (std::abs(val) < 1.01)

Check failure on line 887 in PWGCF/GenericFramework/Tasks/flowGfwV02.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
fFC->FillProfile(Form("%s_pt_%i", corrconfigs.at(l_ind).Head.c_str(), i), centmult, val * ptFraction, ebyeWeight, rndm);
}
}
}

if (cfgUseV0) {
double v0corrAB = 0;
double v0corrBA = 0;
double ptMeanForward = pidStates.hPtForward[PidCharged]->GetMean();
double ptMeanBackward = pidStates.hPtBackward[PidCharged]->GetMean();
double ptFractionForward = 0.;
double ptFractionBackward = 0.;
for (int pid = 0; pid < PidTotal; pid++) {
int normIndex = (cfgNormalizeByCharged) ? PidCharged : pid;
for (int i = 1; i <= fSecondAxis->GetNbins(); i++) {
ptFractionForward = pidStates.hPtForward[pid]->GetBinContent(i) / pidStates.hPtForward[normIndex]->Integral();
ptFractionBackward = pidStates.hPtBackward[pid]->GetBinContent(i) / pidStates.hPtBackward[normIndex]->Integral();
v0corrAB = ptFractionForward * ptMeanBackward;
v0corrBA = ptFractionBackward * ptMeanForward;
registry.fill(HIST("analysis/v0AB"), pid, fSecondAxis->GetBinCenter(i), centmult, v0corrAB);
registry.fill(HIST("analysis/v0BA"), pid, fSecondAxis->GetBinCenter(i), centmult, v0corrBA);
registry.fill(HIST("analysis/nchA"), pid, fSecondAxis->GetBinCenter(i), centmult, ptFractionForward);
registry.fill(HIST("analysis/nchB"), pid, fSecondAxis->GetBinCenter(i), centmult, ptFractionBackward);
}
registry.fill(HIST("analysis/ptA"), pid, centmult, multiplicity, ptMeanForward);
registry.fill(HIST("analysis/ptB"), pid, centmult, multiplicity, ptMeanBackward);
registry.fill(HIST("analysis/ptAB"), pid, centmult, multiplicity, ptMeanForward * ptMeanBackward);
}
}

// Fill the profiles for each pT bin
auto dnx = fGFW->Calculate(corrconfigs.at(0), 0, kTRUE).real();
if (dnx == 0)
Expand All @@ -857,9 +926,10 @@
ptFraction = pidStates.hPtMid[PidCharged]->GetBinContent(i) / pidStates.hPtMid[PidCharged]->Integral();
if (std::abs(val) < 1)
registry.fill(HIST("v02pt"), fSecondAxis->GetBinCenter(i), centmult, val * ptFraction, (cfgUseMultiplicityFlowWeights) ? dnx : 1.0);
registry.fill(HIST("nchMid"), fSecondAxis->GetBinCenter(i), centmult, ptFraction);
registry.fill(HIST("nchMid"), fSecondAxis->GetBinCenter(i), centmult, multiplicity, ptFraction);
}
}
registry.fill(HIST("v02centmult"), centmult, multiplicity, val);
return;
}

Expand Down Expand Up @@ -891,23 +961,47 @@
pidStates.hPtMid[PidPions]->Reset();
pidStates.hPtMid[PidKaons]->Reset();
pidStates.hPtMid[PidProtons]->Reset();
pidStates.hPtBackward[PidCharged]->Reset();
pidStates.hPtBackward[PidPions]->Reset();
pidStates.hPtBackward[PidKaons]->Reset();
pidStates.hPtBackward[PidProtons]->Reset();
pidStates.hPtForward[PidCharged]->Reset();
pidStates.hPtForward[PidPions]->Reset();
pidStates.hPtForward[PidKaons]->Reset();
pidStates.hPtForward[PidProtons]->Reset();

float lRandom = fRndm->Rndm();

// Loop over tracks and check if they are accepted
AcceptedTracks acceptedTracks{0, 0, 0, 0};
for (const auto& track : tracks) {
processTrack(track, vtxz, xaxis.multiplicity, run, acceptedTracks);
if (track.eta() > -0.4 && track.eta() < 0.4)
if (track.eta() > cfgSubeventCuts.cfgEtaSubCMin && track.eta() < cfgSubeventCuts.cfgEtaSubCMax)
pidStates.hPtMid[PidCharged]->Fill(track.pt(), getEfficiency(track, PidCharged));
if (track.eta() > cfgSubeventCuts.cfgEtaSubAMin && track.eta() < cfgSubeventCuts.cfgEtaSubAMax) // add mean pT
pidStates.hPtBackward[PidCharged]->Fill(track.pt(), getEfficiency(track, PidCharged));
if (track.eta() > cfgSubeventCuts.cfgEtaSubBMin && track.eta() < cfgSubeventCuts.cfgEtaSubBMax) // add mean pT
pidStates.hPtForward[PidCharged]->Fill(track.pt(), getEfficiency(track, PidCharged));
// If PID is identified, fill pt spectrum for the corresponding particle
int pidInd = getNsigmaPID(track);
if (pidInd != -1 && track.eta() > -0.4 && track.eta() < 0.4) {
if (pidInd != -1 && track.eta() > cfgSubeventCuts.cfgEtaSubCMin && track.eta() < cfgSubeventCuts.cfgEtaSubCMax) {
if (cfgPIDEfficiency)
pidStates.hPtMid[pidInd]->Fill(track.pt(), getEfficiency(track, pidInd));
else
pidStates.hPtMid[pidInd]->Fill(track.pt(), getEfficiency(track, PidCharged)); // Default to charged particles if PID efficiency is not used
}
if (pidInd != -1 && track.eta() > cfgSubeventCuts.cfgEtaSubAMin && track.eta() < cfgSubeventCuts.cfgEtaSubAMax) {
if (cfgPIDEfficiency)
pidStates.hPtBackward[pidInd]->Fill(track.pt(), getEfficiency(track, pidInd));
else
pidStates.hPtBackward[pidInd]->Fill(track.pt(), getEfficiency(track, PidCharged)); // Default to charged particles if PID efficiency is not used
}
if (pidInd != -1 && track.eta() > cfgSubeventCuts.cfgEtaSubBMin && track.eta() < cfgSubeventCuts.cfgEtaSubBMax) {
if (cfgPIDEfficiency)
pidStates.hPtForward[pidInd]->Fill(track.pt(), getEfficiency(track, pidInd));
else
pidStates.hPtForward[pidInd]->Fill(track.pt(), getEfficiency(track, PidCharged)); // Default to charged particles if PID efficiency is not used
}
}
if (cfgConsistentEventFlag & 1)
if (!acceptedTracks.nPos || !acceptedTracks.nNeg)
Expand All @@ -922,7 +1016,7 @@
if (acceptedTracks.nPos < 2 || acceptedTracks.nMid < 2 || acceptedTracks.nNeg < 2) // o2-linter: disable=magic-number (at least two tracks in all three subevents)
return;
// Fill output containers
fillOutputContainers<dt>(xaxis.centrality, lRandom, run);
fillOutputContainers<dt>(xaxis.centrality, xaxis.multiplicity, lRandom, run);
}

template <typename TTrack>
Expand Down
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