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[PWGCF] Femto: add optional kT-dependent dphistar cut in CPR #17488

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[PWGCF] Femto: add optional kT-dependent dphistar cut in CPR #17488

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19 changes: 18 additions & 1 deletion PWGCF/Femto/Core/closePairRejection.h
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,8 @@
#include <Framework/HistogramSpec.h>
#include <Framework/Logger.h>

#include <TF1.h>

#include <array>
#include <chrono>
#include <cmath>
Expand Down Expand Up @@ -69,6 +71,8 @@ struct ConfCpr : o2::framework::ConfigurableGroup {
o2::framework::Configurable<bool> plotAngularCorrelation{"plotAngularCorrelation", false, "Plot angular correlation of particles (eta1 vs eta2 & phi1 vs phi2"};
o2::framework::Configurable<float> detaMax{"detaMax", 0.01f, "Maximium deta"};
o2::framework::Configurable<float> dphistarMax{"dphistarMax", 0.01f, "Maximum dphistar"};
o2::framework::Configurable<bool> ktDependent{"ktDependent", false, "If true, use dphistarMaxFormula instead of dphistarMax"};
o2::framework::Configurable<std::string> dphistarMaxFormula{"dphistarMaxFormula", "0.01", "Maximum dphistar as TFormula, x=kT"};
o2::framework::Configurable<float> detaCenter{"detaCenter", 0.f, "Center of deta cut"};
o2::framework::Configurable<float> dphistarCenter{"dphistarCenter", 0.f, "Center of dphistar cut"};
o2::framework::Configurable<float> kinematicMin{"kinematicMin", -1.f, "Minimum kstar/Q3 of pair/triplet for plotting (Set to negative value to turn off the cut)"};
Expand Down Expand Up @@ -191,9 +195,14 @@ class CloseTrackRejection
{
mDetaMax = confCpr.detaMax.value;
mDphistarMax = confCpr.dphistarMax.value;
mKtDependent = confCpr.ktDependent.value;

if (mKtDependent) {
mDphistarMaxFunc = TF1((std::string(prefix) + "DphistarMax").c_str(), confCpr.dphistarMaxFormula.value.c_str(), 0.f, 10.f);
}

// check the limits
if (mDetaMax <= 0 || mDphistarMax <= 0) {
if (mDetaMax <= 0 || (!mKtDependent && mDphistarMax <= 0)) {
LOG(fatal) << "Limits for Close Pair Rejection are invalid (0 or negative). Breaking...";
}

Expand Down Expand Up @@ -292,6 +301,12 @@ class CloseTrackRejection
mAverageDphistar = 0.f; // if computation at all radii fail, set it 0
}

if (mKtDependent) {
const float ktx = t1.pt() * std::cos(t1.phi()) + t2.pt() * std::cos(t2.phi());
const float kty = t1.pt() * std::sin(t1.phi()) + t2.pt() * std::sin(t2.phi());
mDphistarMax = mDphistarMaxFunc.Eval(0.5f * std::hypot(ktx, kty));
}

if (mPlotAngularCorrelation) {
mPhi1 = t1.phi();
mPhi2 = t2.phi();
Expand Down Expand Up @@ -414,6 +429,8 @@ class CloseTrackRejection
float mDphistarMax = 0.f;
float mDetaCenter = 0.f;
float mDphistarCenter = 0.f;
bool mKtDependent = false;
TF1 mDphistarMaxFunc;

float mAverageDphistar = 0.f;
float mDeta = 0.f;
Expand Down
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