pythia-tutorial/tutorial1.cc at master · MustafaSchmidt/pythia-tutorial · GitHub

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#include <iostream>

#include "Pythia8/Pythia.h"

int main()
{
    int nevents = 10;

    Pythia8::Pythia pythia;

    pythia.readString("Beams:idA = 2212");
    pythia.readString("Beams:idB = 2212");
    pythia.readString("Beams:eCM = 14.e3");
    pythia.readString("SoftQCD:all = on");
    pythia.readString("HardQCD:all = on");


    pythia.init();

    for(int i = 0; i < nevents; i++)
    {
        if(!pythia.next()) continue;

        int entries = pythia.event.size();

        std::cout << "Event: " << i << std::endl;
        std::cout << "Event size: " << entries << std::endl;

        for(int j = 0; j < entries; j++)
        {
            int id = pythia.event[j].id();

            double m = pythia.event[j].m();

            double px = pythia.event[j].px();
            double py = pythia.event[j].py();
            double pz = pythia.event[j].pz();

            double pabs = sqrt(pow(px,2) + pow(py,2) + pow(pz,2));

            std::cout << id << " " << m << " " << pabs << std::endl;
        }
    }

    return 0;
}