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adds Heavy Ion initialization to Pythia #48414

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Merged
cmsbuild merged 4 commits into from
Jul 4, 2025
Merged

adds Heavy Ion initialization to Pythia #48414

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d59103a
add HI init to Py
michael-pitt Jun 25, 2025
4920a5e
code-format
michael-pitt Jun 26, 2025
e497d79
modify from master
michael-pitt Jun 26, 2025
5f124f5
restore code-format
michael-pitt Jun 26, 2025
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64 changes: 38 additions & 26 deletions GeneratorInterface/Pythia8Interface/plugins/Pythia8Hadronizer.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -150,8 +150,8 @@ class Pythia8Hadronizer : public Py8InterfaceBase {
std::string LHEInputFileName;
std::shared_ptr<LHAupLesHouches> lhaUP;

enum { PP, PPbar, ElectronPositron };
int fInitialState; // pp, ppbar, or e-e+
enum { PP, PPbar, ElectronPositron, HeavyIons };
int fInitialState; // pp, ppbar, e-e+ or HI

double fBeam1PZ;
double fBeam2PZ;
Expand Down Expand Up @@ -255,6 +255,15 @@ Pythia8Hadronizer::Pythia8Hadronizer(const edm::ParameterSet &params)
} else {
// probably need to throw on attempt to override ?
}
} else if (params.exists("HeavyIonInitialState")) {
if (fInitialState == PP) {
fInitialState = HeavyIons;
edm::LogInfo("GeneratorInterface|Pythia8Interface")
<< "Pythia8 will be initialized for HEAVY ION collisions. "
<< "This is a user-request change from the DEFAULT PROTON-PROTON initial state.";
} else {
// probably need to throw on attempt to override ?
}
} else if (params.exists("ElectronProtonInitialState") || params.exists("PositronProtonInitialState")) {
// throw on unknown initial state !
throw edm::Exception(edm::errors::Configuration, "Pythia8Interface")
Expand All @@ -273,8 +282,8 @@ Pythia8Hadronizer::Pythia8Hadronizer(const edm::ParameterSet &params)
if (params.exists("reweightGen")) {
edm::LogInfo("Pythia8Interface") << "Start setup for reweightGen";
edm::ParameterSet rgParams = params.getParameter<edm::ParameterSet>("reweightGen");
fReweightUserHook = std::make_shared<PtHatReweightUserHook>(
rgParams.getParameter<double>("pTRef"), rgParams.getParameter<double>("power"));
fReweightUserHook = std::make_shared<PtHatReweightUserHook>(rgParams.getParameter<double>("pTRef"),
rgParams.getParameter<double>("power"));
edm::LogInfo("Pythia8Interface") << "End setup for reweightGen";
}
if (params.exists("reweightGenEmp")) {
Expand All @@ -291,22 +300,23 @@ Pythia8Hadronizer::Pythia8Hadronizer(const edm::ParameterSet &params)
edm::LogInfo("Pythia8Interface") << "Start setup for reweightGenRap";
edm::ParameterSet rgrParams = params.getParameter<edm::ParameterSet>("reweightGenRap");
fReweightRapUserHook = std::make_shared<RapReweightUserHook>(rgrParams.getParameter<std::string>("yLabSigmaFunc"),
rgrParams.getParameter<double>("yLabPower"),
rgrParams.getParameter<std::string>("yCMSigmaFunc"),
rgrParams.getParameter<double>("yCMPower"),
rgrParams.getParameter<double>("pTHatMin"),
rgrParams.getParameter<double>("pTHatMax"));
edm::LogInfo("Pythia8Interface") << "End setup for reweightGenRap";
}
if (params.exists("reweightGenPtHatRap")) {
edm::LogInfo("Pythia8Interface") << "Start setup for reweightGenPtHatRap";
edm::ParameterSet rgrParams = params.getParameter<edm::ParameterSet>("reweightGenPtHatRap");
fReweightPtHatRapUserHook = std::make_shared<PtHatRapReweightUserHook>(rgrParams.getParameter<std::string>("yLabSigmaFunc"),
rgrParams.getParameter<double>("yLabPower"),
rgrParams.getParameter<std::string>("yCMSigmaFunc"),
rgrParams.getParameter<double>("yCMPower"),
rgrParams.getParameter<double>("pTHatMin"),
rgrParams.getParameter<double>("pTHatMax"));
edm::LogInfo("Pythia8Interface") << "End setup for reweightGenRap";
}
if (params.exists("reweightGenPtHatRap")) {
edm::LogInfo("Pythia8Interface") << "Start setup for reweightGenPtHatRap";
edm::ParameterSet rgrParams = params.getParameter<edm::ParameterSet>("reweightGenPtHatRap");
fReweightPtHatRapUserHook =
std::make_shared<PtHatRapReweightUserHook>(rgrParams.getParameter<std::string>("yLabSigmaFunc"),
rgrParams.getParameter<double>("yLabPower"),
rgrParams.getParameter<std::string>("yCMSigmaFunc"),
rgrParams.getParameter<double>("yCMPower"),
rgrParams.getParameter<double>("pTHatMin"),
rgrParams.getParameter<double>("pTHatMax"));
edm::LogInfo("Pythia8Interface") << "End setup for reweightGenPtHatRap";
}

Expand Down Expand Up @@ -360,16 +370,16 @@ Pythia8Hadronizer::Pythia8Hadronizer(const edm::ParameterSet &params)
if (params.exists("EV1_nFinalMode"))
EV1_nFinalMode = params.getParameter<int>("EV1_nFinalMode");
fEmissionVetoHook1 = std::make_shared<EmissionVetoHook1>(EV1_nFinal,
EV1_vetoOn,
EV1_maxVetoCount,
EV1_pThardMode,
EV1_pTempMode,
EV1_emittedMode,
EV1_pTdefMode,
EV1_MPIvetoOn,
EV1_QEDvetoMode,
EV1_nFinalMode,
0);
EV1_vetoOn,
EV1_maxVetoCount,
EV1_pThardMode,
EV1_pTempMode,
EV1_emittedMode,
EV1_pTdefMode,
EV1_MPIvetoOn,
EV1_QEDvetoMode,
EV1_nFinalMode,
0);
}

if (params.exists("UserCustomization")) {
Expand Down Expand Up @@ -409,10 +419,12 @@ bool Pythia8Hadronizer::initializeForInternalPartons() {
} else if (fInitialState == ElectronPositron) {
fMasterGen->settings.mode("Beams:idA", 11);
fMasterGen->settings.mode("Beams:idB", -11);
} else if (fInitialState == HeavyIons) {
// let user to set up the beam particles
} else {
// throw on unknown initial state !
throw edm::Exception(edm::errors::Configuration, "Pythia8Interface")
<< " UNKNOWN INITIAL STATE. \n The allowed initial states are: PP, PPbar, ElectronPositron \n";
<< " UNKNOWN INITIAL STATE. \n The allowed initial states are: PP, PPbar, ElectronPositron, HeavyIons \n";
}
fMasterGen->settings.parm("Beams:eCM", comEnergy);
} else {
Expand Down