Gabriele Cosmo
95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
//
|
|
// ********************************************************************
|
|
// * DISCLAIMER *
|
|
// * *
|
|
// * The following disclaimer summarizes all the specific disclaimers *
|
|
// * of contributors to this software. The specific disclaimers,which *
|
|
// * govern, are listed with their locations in: *
|
|
// * http://cern.ch/geant4/license *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. *
|
|
// * *
|
|
// * This code implementation is the intellectual property of the *
|
|
// * GEANT4 collaboration. *
|
|
// * By copying, distributing or modifying the Program (or any work *
|
|
// * based on the Program) you indicate your acceptance of this *
|
|
// * statement, and all its terms. *
|
|
// ********************************************************************
|
|
// $Id: example_MyPythia.cc,v 1.3 2002/12/13 11:42:38 gcosmo Exp $
|
|
// ====================================================================
|
|
// example_MyPythia.cc
|
|
//
|
|
// sample event generation using Pythia and HepMC(CLHEP)
|
|
// ====================================================================
|
|
|
|
#include "CLHEP/HepMC/CBhepevt.h"
|
|
#include "CLHEP/HepMC/WriteHepMC.h"
|
|
#include "CLHEP/HepMC/ReadHepMC.h"
|
|
#include "CLHEP/HepMC/include/PythiaWrapper6_2.h"
|
|
|
|
#include <string>
|
|
#include <fstream>
|
|
|
|
// global parameters
|
|
hepev2_t hepev2_;
|
|
hepev3_t hepev3_;
|
|
hepev4_t hepev4_;
|
|
hepev5_t hepev5_;
|
|
|
|
int main() {
|
|
// initialize Pythia...
|
|
// select W+gamma process (process number 20)
|
|
pysubs.msel= 0;
|
|
pysubs.msub[20-1]= 1;
|
|
// set random number seed (mandatory!)
|
|
pydatr.mrpy[0]= 55122 ;
|
|
// tell Pythia not to write multiple copies of particles in event record.
|
|
pypars.mstp[128-1]= 2;
|
|
// example of setting a Pythia parameter: set the top mass
|
|
pydat2.pmas[1-1][6-1]= 175;
|
|
// call pythia initialization
|
|
call_pyinit( "CMS", "p", "p", 14000. );
|
|
|
|
// prepare HepMC-HEPEVT interface...
|
|
HepMC::CBhepevt* hepevtio= new HepMC::CBhepevt;
|
|
|
|
std::ofstream to;
|
|
std::string fname= "example_MyPythia.dat";
|
|
to.open(fname.c_str(), std::ios::out);
|
|
|
|
HepMC::writeComment(to, "generate sample pythia events...");
|
|
for ( int i = 1; i <= 10; i++ ) {
|
|
if ( i%50==1 ) std::cout << "Processing Event Number "
|
|
<< i << std::endl;
|
|
call_pyevnt(); // generate one event with Pythia
|
|
// pythia pyhepc routine converts common PYJETS in common HEPEVT
|
|
call_pyhepc( 1 );
|
|
|
|
HepMC::GenEvent* evt= new HepMC::GenEvent();
|
|
hepevtio-> toGenEvent(evt, false);
|
|
hepevtio-> clean(); // clear HEPEVT
|
|
|
|
// add some information to the event
|
|
evt-> set_event_number(i);
|
|
evt-> set_signal_process_id(20);
|
|
|
|
// write the event out to the ascii file
|
|
to << evt;
|
|
|
|
// we also need to delete the created event from memory
|
|
delete evt;
|
|
}
|
|
|
|
// write out some information from Pythia to the screen
|
|
call_pystat(1);
|
|
to.close();
|
|
delete hepevtio;
|
|
|
|
return 0;
|
|
}
|
|
|