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[PWGLF] added spin-isospin scaling factor and removed event selection #2021

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Merged
njacazio merged 1 commit into from
Jun 3, 2025
Merged

[PWGLF] added spin-isospin scaling factor and removed event selection #2021

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8 changes: 4 additions & 4 deletions MC/config/PWGLF/ini/tests/GeneratorLF_deuteron_wigner.C
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Original file line number Diff line number Diff line change
Expand Up @@ -31,11 +31,11 @@ int External() {
}

if (nSelected == 0) {
std::cerr << "No event of interest\n";
return 1;
std::cout << "No events with deuterons found.\n";
} else {
std::cout << "Found " << nSelected << " events with deuterons\n";
}

std::cout << "Found " << nSelected << " events with deuterons\n";
return 0;

}

30 changes: 9 additions & 21 deletions MC/config/PWGLF/pythia8/generator_pythia8_deuteron_wigner.C
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Original file line number Diff line number Diff line change
Expand Up @@ -46,35 +46,26 @@ public:
~GeneratorPythia8DeuteronWigner() override = default;

bool Init() override {
addSubGenerator(0, "Pythia8 with (anti)deuterons formed via coalescence using the Wigner density formalism");
addSubGenerator(0, "Pythia8 events with (anti)deuterons formed via coalescence using the Wigner density formalism, provided the coalescence condition is fulfilled");
return o2::eventgen::GeneratorPythia8::Init();
}

protected:
bool generateEvent() override {
if (mGeneratedEvents % 100 == 0) {
LOG(info) << ">> Generating event " << mGeneratedEvents;
}

bool genOk = false;
int localCounter = 0;
while (!genOk) {
if (GeneratorPythia8::generateEvent()) {
genOk = selectEvent(mPythia.event);
}
localCounter++;

if (GeneratorPythia8::generateEvent() && EventHasDeuteron(mPythia.event)) {
LOG(debug) << ">> A Deuteron was formed!";
}

LOG(debug) << ">> Generation of event of interest successful after " << localCounter << " iterations";
notifySubGenerator(0);
++mGeneratedEvents;
return true;
}

bool selectEvent(Pythia8::Event& event) {
bool EventHasDeuteron(Pythia8::Event& event) {

const double md = 1.87561294257; // Deuteron mass [GeV]
bool deuteronIsFormed = false;
const double md = 1.87561294257; // Deuteron mass [GeV]

std::vector<int> proton_ID, neutron_ID;
std::vector<int> proton_status, neutron_status;
Expand All @@ -94,10 +85,6 @@ protected:
}
}

if (proton_ID.empty() || neutron_ID.empty()) {
return false;
}

int radiusBin = mTwoDimCoalProbability->GetXaxis()->FindBin(mSourceRadius);
TH1D* prob_vs_q = mTwoDimCoalProbability->ProjectionY("prob_vs_q", radiusBin, radiusBin, "E");
prob_vs_q->SetDirectory(nullptr);
Expand Down Expand Up @@ -130,9 +117,10 @@ protected:
continue;
}
double coalProb = prob_vs_q->GetBinContent(prob_vs_q->FindBin(deltaP));
double rnd = gRandom->Uniform(0.0, 1.0);
double rndCoalProb = gRandom->Uniform(0.0, 1.0);
double rndSpinIsospin = gRandom->Uniform(0.0, 1.0);

if (rnd < coalProb) {
if (rndCoalProb < coalProb && rndSpinIsospin < 3.0/8.0) {
double energy = std::hypot(p.pAbs(), md);
p.e(energy);
int deuteronPDG = sign_p * 1000010020;
Expand Down