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[PWGLF] Changed publisehd to flat pT for injected phi for higher statistics #2473

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Merged
njacazio merged 1 commit into from
Sep 24, 2026
Merged

[PWGLF] Changed publisehd to flat pT for injected phi for higher statistics #2473

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33 changes: 17 additions & 16 deletions MC/config/PWGLF/pythia8/GeneratorLF_phiphi.C
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
#include "Pythia8/Pythia.h"
#include "TRandom3.h"
#include "TMath.h"
#include "TF1.h"
// #include "TF1.h"
#include "TParticle.h"
#include "TSystem.h"
#if __has_include("SimulationDataFormat/MCGenStatus.h")
Expand All @@ -21,12 +21,12 @@
#include <string>
#endif

Double_t FuncLavy(Double_t *x, Double_t *par)
{
// Double_t FuncLavy(Double_t *x, Double_t *par)
// {

Double_t p = (par[0] - 1) * (par[0] - 2) * par[1] * x[0] / (((pow((1 + (((sqrt((par[2] * par[2]) + (x[0] * x[0]))) - par[2]) / (par[0] * par[3]))), par[0]) * (par[0] * par[3] * ((par[0] * par[3]) + (par[2] * (par[0] - 2)))))));
return (p);
}
// Double_t p = (par[0] - 1) * (par[0] - 2) * par[1] * x[0] / (((pow((1 + (((sqrt((par[2] * par[2]) + (x[0] * x[0]))) - par[2]) / (par[0] * par[3]))), par[0]) * (par[0] * par[3] * ((par[0] * par[3]) + (par[2] * (par[0] - 2)))))));
// return (p);
// }

class GeneratorPhiResonance : public o2::eventgen::GeneratorPythia8
{
Expand Down Expand Up @@ -77,15 +77,15 @@ public:
// // Thermal pT distribution for phi-phi resonance
// mThermal = new TF1("mThermal", "x*sqrt(x*x+[0]*[0])*exp(-sqrt(x*x+[0]*[0])/[1])", mPtMin, mPtMaxPhiPhi);

// Lévy-Tsallis pT distribution for direct phi
mLevyTsallis = new TF1("mLevyTsallis", FuncLavy, mPtMin, 100.0, 4);
// // Lévy-Tsallis pT distribution for direct phi
// mLevyTsallis = new TF1("mLevyTsallis", FuncLavy, mPtMin, 100.0, 4);

mLevyTsallis->SetParameters(
7.60279, // n
0.0374237, // dN/dy
1.01946, // mass
0.338379 // T
);
// mLevyTsallis->SetParameters(
// 7.60279, // n
// 0.0374237, // dN/dy
// 1.01946, // mass
// 0.338379 // T
// );
}

Bool_t generateEvent() override
Expand Down Expand Up @@ -193,7 +193,8 @@ private:
}
else
{
pt = mLevyTsallis->GetRandom();
// pt = mLevyTsallis->GetRandom();
pt = gRandom->Uniform(mPtMin, 100.0); // Falling back to flat pT due to low statistics in high pT
}

const double px = pt * std::cos(phi);
Expand Down Expand Up @@ -227,7 +228,7 @@ private:
Pythia8::Pythia pythiaObjectMinimumBias;

// TF1 *mThermal;
TF1 *mLevyTsallis;
// TF1 *mLevyTsallis;
};

/// Entry point for o2-sim
Expand Down
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