chigen::pythia Namespace Reference

Functions
void	initialize_pythia ()

Variables
Pythia8::Pythia *	pythia = 0
Pythia8::PDF *	pdf = 0

Function Documentation

void chigen::pythia::initialize_pythia

(

)

Definition at line 177 of file ChiGenContext.cxx.

References chigen::random::pythia_random_engine, X3872_MASS, X3872_PDG_ID, and X3872_STRING.

Referenced by chigen::initialize().

                                 {
            pdf = new Pythia8::CTEQ6pdf(2212, 1, getenv("PYTHIA8DATA"));

            pythia = new Pythia8::Pythia(getenv("PYTHIA8DATA"));
            pythia->rndm = *random::pythia_random_engine;

            pythia->readString("ProcessLevel:all = off");
            //not allow charmonia to decay with Pythia
            pythia->readString("20443:mayDecay = off");
            pythia->readString("445:mayDecay = off");
            pythia->readString("443:mayDecay = off");
            
            //x3872 is not implemented in PYTHIA
            pythia->particleData.addParticle(
                    X3872_PDG_ID, // id
                    X3872_STRING, // name
                    3, // spinType
                    0, // chargeType
                    0, // colType
                    X3872_MASS, // m0
                    0.0001, // mWidth
                    X3872_MASS-0.0001, // mMin
                    X3872_MASS+0.0001 // mMax
                    );
            pythia->readString("9920443:mayDecay = off");
           
            pythia->init();
        }

Variable Documentation

Pythia8::PDF * chigen::pythia::pdf = 0

Pointer to Pythia PDF sets

Definition at line 175 of file ChiGenContext.cxx.

Referenced by PndRichRecoTask::Exec(), reco(), and chigen::models::ColorSingletPartonicModel::setSigma().

Pythia8::Pythia * chigen::pythia::pythia = 0

Pointer to Pythia instance

Definition at line 174 of file ChiGenContext.cxx.

Referenced by main(), chigen::PythiaChiGen::next(), and chigen::PndChiGenExclusive::ReadEvent().