Gabriele Cosmo
98 lines
3.7 KiB
C++
98 lines
3.7 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// sample event generation using Pythia and HepMC(CLHEP)
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// ====================================================================
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// $Id: example_MyPythia.cc,v 1.4 2006/06/29 17:06:50 gunter Exp $
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// ====================================================================
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// example_MyPythia.cc
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#include "CLHEP/HepMC/CBhepevt.h"
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#include "CLHEP/HepMC/WriteHepMC.h"
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#include "CLHEP/HepMC/ReadHepMC.h"
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#include "CLHEP/HepMC/include/PythiaWrapper6_2.h"
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#include <string>
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#include <fstream>
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// global parameters
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hepev2_t hepev2_;
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hepev3_t hepev3_;
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hepev4_t hepev4_;
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hepev5_t hepev5_;
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int main() {
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// initialize Pythia...
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// select W+gamma process (process number 20)
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pysubs.msel= 0;
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pysubs.msub[20-1]= 1;
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// set random number seed (mandatory!)
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pydatr.mrpy[0]= 55122 ;
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// tell Pythia not to write multiple copies of particles in event record.
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pypars.mstp[128-1]= 2;
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// example of setting a Pythia parameter: set the top mass
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pydat2.pmas[1-1][6-1]= 175;
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// call pythia initialization
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call_pyinit( "CMS", "p", "p", 14000. );
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// prepare HepMC-HEPEVT interface...
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HepMC::CBhepevt* hepevtio= new HepMC::CBhepevt;
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std::ofstream to;
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std::string fname= "example_MyPythia.dat";
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to.open(fname.c_str(), std::ios::out);
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HepMC::writeComment(to, "generate sample pythia events...");
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for ( int i = 1; i <= 10; i++ ) {
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if ( i%50==1 ) std::cout << "Processing Event Number "
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<< i << std::endl;
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call_pyevnt(); // generate one event with Pythia
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// pythia pyhepc routine converts common PYJETS in common HEPEVT
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call_pyhepc( 1 );
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HepMC::GenEvent* evt= new HepMC::GenEvent();
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hepevtio-> toGenEvent(evt, false);
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hepevtio-> clean(); // clear HEPEVT
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// add some information to the event
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evt-> set_event_number(i);
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evt-> set_signal_process_id(20);
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// write the event out to the ascii file
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to << evt;
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// we also need to delete the created event from memory
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delete evt;
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}
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// write out some information from Pythia to the screen
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call_pystat(1);
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to.close();
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delete hepevtio;
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return 0;
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}
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