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Added runtime user hook for triggered events to LambdaB gen #2461

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Added runtime user hook for triggered events to LambdaB gen #2461

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16 changes: 16 additions & 0 deletions MC/config/PWGHF/external/generator/generator_pythia8_hfhadron_to_nuclei.C
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@

R__ADD_INCLUDE_PATH($O2DPG_MC_CONFIG_ROOT)
#include "MC/config/common/external/generator/CoalescencePythia8.h"
#include "MC/config/PWGHF/pythia8/hooks/pythia8_userhooks_qqbar.C"

using namespace Pythia8;

Expand Down Expand Up @@ -60,6 +61,16 @@ class GeneratorPythia8HFHadToNuclei : public o2::eventgen::GeneratorPythia8
{
addSubGenerator(0, "Minimum bias");
addSubGenerator(1, "HF + Coalescence");

// Bias parton-level generation towards bbbar production at midrapidity, but only
// while generating the triggered events. Without this, finding the requested b-hadron
// can stall the jobs for a very long time
mBbbarBiasHook = new UserHooks_qqbar();
mBbbarBiasHook->setPDG(5);
mBbbarBiasHook->setRapidity(mHadRapidityMin, mHadRapidityMax);
mBbbarBiasHook->setActive(false);
setUserHooks(mBbbarBiasHook);

return o2::eventgen::GeneratorPythia8::Init();
}

Expand Down Expand Up @@ -93,11 +104,13 @@ class GeneratorPythia8HFHadToNuclei : public o2::eventgen::GeneratorPythia8

// Generate event of interest
bool genOk = false;
mBbbarBiasHook->setActive(true);
while (!genOk) {
if (GeneratorPythia8::generateEvent()) {
genOk = selectEvent(mPythia.event);
}
}
mBbbarBiasHook->setActive(false);
notifySubGenerator(1);
} else {
// Generate minimum-bias event
Expand Down Expand Up @@ -178,6 +191,9 @@ class GeneratorPythia8HFHadToNuclei : public o2::eventgen::GeneratorPythia8
float mHadRapidityMax;
unsigned int mUsedSeed;

// Bias towards bbbar at midrapidity, active only while generating HF-triggered events
UserHooks_qqbar* mBbbarBiasHook{nullptr};

// Control gap-triggering
unsigned long long mGeneratedEvents;
int mInverseTriggerRatio;
Expand Down
8 changes: 8 additions & 0 deletions MC/config/PWGHF/pythia8/hooks/pythia8_userhooks_qqbar.C
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,10 @@ class UserHooks_qqbar : public Pythia8::UserHooks
bool canVetoPartonLevel() override { return true; };
bool doVetoPartonLevel(const Pythia8::Event& event) override
{
// Veto runtime condition
if (!mActive) {
return false;
}
// search for c-cbar mother with at least one c at midrapidity
for (int ipa = 0; ipa < event.size(); ++ipa) {
auto daughterList = event[ipa].daughterList();
Expand All @@ -40,11 +44,15 @@ class UserHooks_qqbar : public Pythia8::UserHooks
mRapidityMin = valMin;
mRapidityMax = valMax;
};
// Allows the veto to be switched on/off at run time, e.g. so that a generator
// alternating between biased and unbiased events can apply the bias selectively.
void setActive(bool val) { mActive = val; };

private:
int mPDG = 4;
double mRapidityMin = -1.5;
double mRapidityMax = 1.5;
bool mActive = true;
};

Pythia8::UserHooks*
Expand Down
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