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[PWGEM,PWGEM-36] taskPi0FlowEMC: Add additional EMCal calib #12661

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mhemmer-cern merged 1 commit into from
Aug 21, 2025
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[PWGEM,PWGEM-36] taskPi0FlowEMC: Add additional EMCal calib #12661

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103 changes: 60 additions & 43 deletions PWGEM/PhotonMeson/Tasks/taskPi0FlowEMC.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -50,12 +50,14 @@
#include <Math/GenVector/AxisAngle.h>
#include <Math/GenVector/Rotation3D.h>
#include <Math/Vector4D.h> // IWYU pragma: keep
#include <TF1.h>
#include <TH1.h>
#include <TString.h>

#include <array>
#include <cmath>
#include <cstdint>
#include <memory>
#include <numbers>
#include <string>
#include <string_view>
Expand Down Expand Up @@ -100,6 +102,8 @@ enum Harmonics {
};

struct TaskPi0FlowEMC {
static constexpr float MinEnergy = 0.7f;

// configurable for flow
Configurable<int> harmonic{"harmonic", 2, "harmonic number"};
Configurable<int> qvecDetector{"qvecDetector", 0, "Detector for Q vector estimation (FT0M: 0, FT0A: 1, FT0C: 2, TPC Pos: 3, TPC Neg: 4, TPC Tot: 5)"};
Expand Down Expand Up @@ -129,6 +133,7 @@ struct TaskPi0FlowEMC {
ConfigurableAxis thnConfigAxisCosDeltaPhi{"thnConfigAxisCosDeltaPhi", {8, -1., 1.}, ""};
ConfigurableAxis thnConfigAxisScalarProd{"thnConfigAxisScalarProd", {100, -5., 5.}, ""};
ConfigurableAxis thnConfigAxisM02{"thnConfigAxisM02", {200, 0., 5.}, ""};
ConfigurableAxis thnConfigAxisEnergyCalib{"thnConfigAxisEnergyCalib", {200, 0., 20.}, ""};

EMPhotonEventCut fEMEventCut;
struct : ConfigurableGroup {
Expand Down Expand Up @@ -195,6 +200,7 @@ struct TaskPi0FlowEMC {
Configurable<std::string> cfgSpresoPath{"cfgSpresoPath", "Users/m/mhemmer/EM/Flow/Resolution", "Path to SP resolution file"};
Configurable<int> cfgApplySPresolution{"cfgApplySPresolution", 0, "Apply resolution correction"};
Configurable<bool> doEMCalCalib{"doEMCalCalib", 0, "Produce output for EMCal calibration"};
Configurable<bool> cfgEnableNonLin{"cfgEnableNonLin", false, "flag to turn extra non linear energy calibration on/off"};
} correctionConfig;

SliceCache cache;
Expand All @@ -209,6 +215,7 @@ struct TaskPi0FlowEMC {
using EMCalPhotons = soa::Join<aod::EMCEMEventIds, aod::SkimEMCClusters>;
using FilteredCollsWithQvecs = soa::Filtered<soa::Join<aod::EMEvents, aod::EMEventsMult, aod::EMEventsCent, aod::EMEventsQvec>>;
using CollsWithQvecs = soa::Join<aod::EMEvents, aod::EMEventsMult, aod::EMEventsCent, aod::EMEventsQvec>;
using Colls = soa::Join<aod::EMEvents, aod::EMEventsMult, aod::EMEventsCent>;

Preslice<EMCalPhotons> perCollisionEMC = aod::emccluster::emeventId;

Expand All @@ -230,6 +237,9 @@ struct TaskPi0FlowEMC {
// static constexpr
static constexpr int64_t NMinPhotonRotBkg = 3;

// Usage when cfgEnableNonLin is enabled
std::unique_ptr<TF1> fEMCalCorrectionFactor; // ("fEMCalCorrectionFactor","(1 + [0]/x + [1]/x^2) / (1 + [2]/x)", 0.3, 100.);

// To access the 1D array
inline int getIndex(int iEta, int iPhi)
{
Expand Down Expand Up @@ -308,10 +318,10 @@ struct TaskPi0FlowEMC {
const AxisSpec thnAxisM02{thnConfigAxisM02, "M_{02}"};
const AxisSpec thAxisTanThetaPhi{mesonConfig.thConfigAxisTanThetaPhi, "atan(#Delta#theta/#Delta#varphi)"};
const AxisSpec thAxisClusterEnergy{thnConfigAxisPt, "#it{E} (GeV)"};
const AxisSpec thAxisEnergyCalib{thnConfigAxisEnergyCalib, "#it{E}_{clus} (GeV)"};
const AxisSpec thAxisAlpha{100, -1., +1, "#alpha"};
const AxisSpec thAxisMult{1000, 0., +1000, "#it{N}_{ch}"};
const AxisSpec thAxisEnergy{1000, 0., 100., "#it{E}_{clus} (GeV)"};
const AxisSpec thAxisEnergyCalib{400, 0., 20., "#it{E}_{clus} (GeV)"};
const AxisSpec thAxisTime{1500, -600, 900, "#it{t}_{cl} (ns)"};
const AxisSpec thAxisEta{320, -0.8, 0.8, "#eta"};
const AxisSpec thAxisPhi{500, 0, 2 * 3.14159, "phi"};
Expand Down Expand Up @@ -439,6 +449,9 @@ struct TaskPi0FlowEMC {

LOG(info) << "thnConfigAxisInvMass.value[1] = " << thnConfigAxisInvMass.value[1] << " thnConfigAxisInvMass.value.back() = " << thnConfigAxisInvMass.value.back();
LOG(info) << "thnConfigAxisPt.value[1] = " << thnConfigAxisPt.value[1] << " thnConfigAxisPt.value.back() = " << thnConfigAxisPt.value.back();

fEMCalCorrectionFactor = std::make_unique<TF1>("fEMCalCorrectionFactor", "(1 + [0]/x + [1]/x^2) / (1 + [2]/x)", 0.3, 100.);
fEMCalCorrectionFactor->SetParameters(-5.33426e-01, 1.40144e-02, -5.24434e-01);
}; // end init

/// Change radians to degree
Expand Down Expand Up @@ -475,7 +488,8 @@ struct TaskPi0FlowEMC {

/// Get the centrality
/// \param collision is the collision with the centrality information
float getCentrality(CollsWithQvecs::iterator const& collision)
template <typename TCollision>
float getCentrality(TCollision const& collision)
{
float cent = -999.;
switch (centEstimator) {
Expand Down Expand Up @@ -728,7 +742,11 @@ struct TaskPi0FlowEMC {
if (checkEtaPhi1D(photon.eta(), RecoDecay::constrainAngle(photon.phi())) >= cfgEMCalMapLevelBackground.value) {
continue;
}
ROOT::Math::PtEtaPhiMVector photon3(photon.pt(), photon.eta(), photon.phi(), 0.);
float energyCorrectionFactor = 1.f;
if (correctionConfig.cfgEnableNonLin.value) {
energyCorrectionFactor = fEMCalCorrectionFactor->Eval(photon.e() > MinEnergy ? photon.e() : MinEnergy);
}
ROOT::Math::PtEtaPhiMVector photon3(energyCorrectionFactor * photon.pt(), photon.eta(), photon.phi(), 0.);
if (iCellIDPhoton1 >= 0) {
ROOT::Math::PtEtaPhiMVector mother1 = photon1 + photon3;
float openingAngle1 = std::acos(photon1.Vect().Dot(photon3.Vect()) / (photon1.P() * photon3.P()));
Expand Down Expand Up @@ -780,8 +798,8 @@ struct TaskPi0FlowEMC {
}

/// \brief Calculate background using rotation background method for calib
template <typename TPhotons>
void rotationBackgroundCalib(const ROOT::Math::PtEtaPhiMVector& meson, ROOT::Math::PtEtaPhiMVector photon1, ROOT::Math::PtEtaPhiMVector photon2, TPhotons const& photons_coll, unsigned int ig1, unsigned int ig2, CollsWithQvecs::iterator const& collision)
template <typename TPhotons, typename TCollision>
void rotationBackgroundCalib(const ROOT::Math::PtEtaPhiMVector& meson, ROOT::Math::PtEtaPhiMVector photon1, ROOT::Math::PtEtaPhiMVector photon2, TPhotons const& photons_coll, unsigned int ig1, unsigned int ig2, TCollision const& collision)
{
// if less than 3 clusters are present skip event since we need at least 3 clusters
if (photons_coll.size() < NMinPhotonRotBkg) {
Expand Down Expand Up @@ -817,7 +835,11 @@ struct TaskPi0FlowEMC {
if (checkEtaPhi1D(photon.eta(), RecoDecay::constrainAngle(photon.phi())) >= cfgEMCalMapLevelBackground.value) {
continue;
}
ROOT::Math::PtEtaPhiMVector photon3(photon.pt(), photon.eta(), photon.phi(), 0.);
float energyCorrectionFactor = 1.f;
if (correctionConfig.cfgEnableNonLin.value) {
energyCorrectionFactor = fEMCalCorrectionFactor->Eval(photon.e() > MinEnergy ? photon.e() : MinEnergy);
}
ROOT::Math::PtEtaPhiMVector photon3(energyCorrectionFactor * photon.pt(), photon.eta(), photon.phi(), 0.);
if (iCellIDPhoton1 >= 0) {
if (std::fabs((photon1.E() - photon3.E()) / (photon1.E() + photon3.E()) < cfgMaxAsymmetry)) { // only use symmetric decays
ROOT::Math::PtEtaPhiMVector mother1 = photon1 + photon3;
Expand Down Expand Up @@ -893,6 +915,10 @@ struct TaskPi0FlowEMC {
void processEMCal(CollsWithQvecs const& collisions, EMCalPhotons const& clusters)
{
int nColl = 1;
float energyCorrectionFactor = 1.f;
if (cfgDoReverseScaling.value) {
energyCorrectionFactor = 1.0505f;
}
for (const auto& collision : collisions) {
auto photonsPerCollision = clusters.sliceBy(perCollisionEMC, collision.globalIndex());

Expand Down Expand Up @@ -971,18 +997,14 @@ struct TaskPi0FlowEMC {
continue;
}
}

ROOT::Math::PtEtaPhiMVector v1(g1.pt(), g1.eta(), g1.phi(), 0.);
ROOT::Math::PtEtaPhiMVector v2(g2.pt(), g2.eta(), g2.phi(), 0.);
if (cfgDoReverseScaling.value) {
// Convert to PxPyPzEVector to modify energy
ROOT::Math::PxPyPzEVector v1Mod(v1);
v1Mod.SetE(v1Mod.E() * 1.0505);
v1 = ROOT::Math::PtEtaPhiMVector(v1Mod.Pt(), v1Mod.Eta(), v1Mod.Phi(), 0.);
ROOT::Math::PxPyPzEVector v2Mod(v2);
v2Mod.SetE(v2Mod.E() * 1.0505);
v2 = ROOT::Math::PtEtaPhiMVector(v2Mod.Pt(), v2Mod.Eta(), v2Mod.Phi(), 0.);
if (correctionConfig.cfgEnableNonLin.value) {
energyCorrectionFactor = fEMCalCorrectionFactor->Eval(g1.e() > MinEnergy ? g1.e() : MinEnergy);
}
ROOT::Math::PtEtaPhiMVector v1(energyCorrectionFactor * g1.pt(), g1.eta(), g1.phi(), 0.);
if (correctionConfig.cfgEnableNonLin.value) {
energyCorrectionFactor = fEMCalCorrectionFactor->Eval(g2.e() > MinEnergy ? g2.e() : MinEnergy);
}
ROOT::Math::PtEtaPhiMVector v2(energyCorrectionFactor * g2.pt(), g2.eta(), g2.phi(), 0.);
ROOT::Math::PtEtaPhiMVector vMeson = v1 + v2;
float dTheta = v1.Theta() - v2.Theta();
float dPhi = v1.Phi() - v2.Phi();
Expand Down Expand Up @@ -1031,6 +1053,10 @@ struct TaskPi0FlowEMC {
// Pi0 from EMCal
void processEMCalMixed(FilteredCollsWithQvecs const& collisions, FilteredEMCalPhotons const& clusters)
{
float energyCorrectionFactor = 1.f;
if (cfgDoReverseScaling.value) {
energyCorrectionFactor = 1.0505f;
}
auto getClustersSize =
[&clusters, this](FilteredCollsWithQvecs::iterator const& col) {
auto associatedClusters = clusters.sliceByCached(emccluster::emeventId, col.globalIndex(), this->cache); // it's cached, so slicing/grouping happens only once
Expand Down Expand Up @@ -1079,18 +1105,14 @@ struct TaskPi0FlowEMC {
continue;
}
}
ROOT::Math::PtEtaPhiMVector v1(g1.pt(), g1.eta(), g1.phi(), 0.);
ROOT::Math::PtEtaPhiMVector v2(g2.pt(), g2.eta(), g2.phi(), 0.);

if (cfgDoReverseScaling.value) {
// Convert to PxPyPzEVector to modify energy
ROOT::Math::PxPyPzEVector v1Mod(v1);
v1Mod.SetE(v1Mod.E() * 1.0505);
v1 = ROOT::Math::PtEtaPhiMVector(v1Mod.Pt(), v1Mod.Eta(), v1Mod.Phi(), 0.);
ROOT::Math::PxPyPzEVector v2Mod(v2);
v2Mod.SetE(v2Mod.E() * 1.0505);
v2 = ROOT::Math::PtEtaPhiMVector(v2Mod.Pt(), v2Mod.Eta(), v2Mod.Phi(), 0.);
if (correctionConfig.cfgEnableNonLin.value) {
energyCorrectionFactor = fEMCalCorrectionFactor->Eval(g1.e() > MinEnergy ? g1.e() : MinEnergy);
}
ROOT::Math::PtEtaPhiMVector v1(energyCorrectionFactor * g1.pt(), g1.eta(), g1.phi(), 0.);
if (correctionConfig.cfgEnableNonLin.value) {
energyCorrectionFactor = fEMCalCorrectionFactor->Eval(g2.e() > MinEnergy ? g2.e() : MinEnergy);
}
ROOT::Math::PtEtaPhiMVector v2(energyCorrectionFactor * g2.pt(), g2.eta(), g2.phi(), 0.);
ROOT::Math::PtEtaPhiMVector vMeson = v1 + v2;

float dTheta = v1.Theta() - v2.Theta();
Expand Down Expand Up @@ -1247,8 +1269,9 @@ struct TaskPi0FlowEMC {
PROCESS_SWITCH(TaskPi0FlowEMC, processResolution, "Process resolution", false);

// EMCal calibration
void processEMCalCalib(CollsWithQvecs const& collisions, EMCalPhotons const& clusters)
void processEMCalCalib(Colls const& collisions, EMCalPhotons const& clusters)
{
float energyCorrectionFactor = 1.f;
if (!correctionConfig.doEMCalCalib) {
return;
}
Expand All @@ -1269,10 +1292,6 @@ struct TaskPi0FlowEMC {
// event selection
continue;
}
if (!isQvecGood(getAllQvec(collision))) {
// selection based on QVector
continue;
}
runNow = collision.runNumber();
if (runNow != runBefore) {
initCCDB(collision);
Expand Down Expand Up @@ -1306,18 +1325,16 @@ struct TaskPi0FlowEMC {
}
}

ROOT::Math::PtEtaPhiMVector v1(g1.pt(), g1.eta(), g1.phi(), 0.);
ROOT::Math::PtEtaPhiMVector v2(g2.pt(), g2.eta(), g2.phi(), 0.);
if (cfgDoReverseScaling.value) {
// Convert to PxPyPzEVector to modify energy
ROOT::Math::PxPyPzEVector v1Mod(v1);
v1Mod.SetE(v1Mod.E() * 1.0505);
v1 = ROOT::Math::PtEtaPhiMVector(v1Mod.Pt(), v1Mod.Eta(), v1Mod.Phi(), 0.);
ROOT::Math::PxPyPzEVector v2Mod(v2);
v2Mod.SetE(v2Mod.E() * 1.0505);
v2 = ROOT::Math::PtEtaPhiMVector(v2Mod.Pt(), v2Mod.Eta(), v2Mod.Phi(), 0.);
if (correctionConfig.cfgEnableNonLin.value) {
energyCorrectionFactor = fEMCalCorrectionFactor->Eval(g1.e() > MinEnergy ? g1.e() : MinEnergy);
}
ROOT::Math::PtEtaPhiMVector v1(energyCorrectionFactor * g1.pt(), g1.eta(), g1.phi(), 0.);
if (correctionConfig.cfgEnableNonLin.value) {
energyCorrectionFactor = fEMCalCorrectionFactor->Eval(g2.e() > MinEnergy ? g2.e() : MinEnergy);
}
ROOT::Math::PtEtaPhiMVector v2(energyCorrectionFactor * g2.pt(), g2.eta(), g2.phi(), 0.);
ROOT::Math::PtEtaPhiMVector vMeson = v1 + v2;

float dTheta = v1.Theta() - v2.Theta();
float dPhi = v1.Phi() - v2.Phi();
float openingAngle = std::acos(v1.Vect().Dot(v2.Vect()) / (v1.P() * v2.P()));
Expand Down
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