EeToeeV/src/EeToeeV/Eepipi.cxx

Go to the documentation of this file.

//*****************************************************************************
//
// Eepipi.cxx
//
// Algorithm runs e+e- ->e+e- rho0, rho0->pi+pi-  precess
//
// July 2016-4-29 Rong-Gang Ping to create package for BES3
// The original fortran code is generated with FDC, consult Prof. Wang Jianxiong
//*****************************************************************************
 
// Header for this module:-
#include "../Eepipi/Eepipi.h"
#include "../Eepipi/EepipiRandom.h"
#include "BesKernel/IBesRndmGenSvc.h"
 
// Framework Related Headers:-
#include "HepMC/GenEvent.h"
#include "HepMC/GenParticle.h"
#include "HepMC/GenVertex.h"
 
#include "GaudiKernel/AlgFactory.h"
#include "GaudiKernel/DataSvc.h"
#include "GaudiKernel/ISvcLocator.h"
#include "GaudiKernel/MsgStream.h"
#include "GaudiKernel/SmartDataPtr.h"
 
#include "CLHEP/Vector/LorentzVector.h"
#include "GeneratorObject/McGenEvent.h"
#include "cfortran/cfortran.h"
 
#include <stdlib.h>
#include <time.h>
 
typedef struct {
  double q1[4][160001]; // e+ beam
  double p1[4][160001]; // e- beam
  double q2[4][160001]; // e-
  double p2[4][160001]; // e+
  double q3[4][160001]; // pi+
  double p3[4][160001]; // pi-
} MOMSET_DEF;
// MOMSET_DEF MOMSET;
#define MOMSET COMMON_BLOCK( MOMSET_DEF, momset )
COMMON_BLOCK_DEF( MOMSET_DEF, MOMSET );
 
// common/beamEnergy/ebeam
typedef struct {
  double ecms;
} BEAMENERGY_DEF;
#define BEAMENERGY COMMON_BLOCK( BEAMENERGY_DEF, beamenergy )
COMMON_BLOCK_DEF( BEAMENERGY_DEF, BEAMENERGY );
// BEAMENERGY_DEF,BEAMENERGY
 
//--//Unify Eepipi random engine with Bes random servive
extern "C" {
extern float flat_();
}
 
float flat_() {
  float  rr;
  double rd = EepipiRandom::random();
  //  std::cout<<"EepipiRandom::random()="<<rd<<endl;
  rr = (float)rd;
  return (float)EepipiRandom::random();
  //  return rr;
}
extern "C" {
extern void intxs_();
}
 
PROTOCCALLSFSUB1( GEVENT, gevent, INT )
#define GEVENT( NEVENTS ) CCALLSFSUB1( GEVENT, gevent, INT, NEVENTS )
 
Eepipi::Eepipi( const string& name, ISvcLocator* pSvcLocator )
    : Algorithm( name, pSvcLocator ) {
  declareProperty( "Ecms", m_Ecms = 3.65 ); // Ecm = sqrt(s) [GeV]
}
 
StatusCode Eepipi::initialize() {
 
  MsgStream log( msgSvc(), name() );
 
  log << MSG::INFO << "Eepipi initialize" << endmsg;
 
  // set Bes unified random engine
  static const bool CREATEIFNOTTHERE( true );
  StatusCode        RndmStatus = service( "BesRndmGenSvc", p_BesRndmGenSvc, CREATEIFNOTTHERE );
  if ( !RndmStatus.isSuccess() || 0 == p_BesRndmGenSvc )
  {
    log << MSG::ERROR << " Could not initialize Random Number Service" << endmsg;
    return RndmStatus;
  }
  CLHEP::HepRandomEngine* engine = p_BesRndmGenSvc->GetEngine( "Eepipi" );
  std::cout << "===============================" << engine << endl;
  EepipiRandom::setRandomEngine( engine );
  //  *****************
 
  BEAMENERGY.ecms = m_Ecms;
  //  std::cout<<"m_Ires= "<<m_Ires<<endl;
 
  getMaxEvent();
  std::cout << "m_evtMax = " << m_evtMax << std::endl;
  intxs_();
  GEVENT( m_evtMax );
 
  return StatusCode::SUCCESS;
}
 
static int evtgen = 1;
StatusCode Eepipi::execute() {
  MsgStream log( msgSvc(), name() );
 
  int npart = 0;
  int pid1, pid2, pid3, pid4, pst1, pst2;
  pid1 = 11;
  pid2 = -11;
  pid3 = 211;
  pid4 = -211;
  pst1 = 1;
  pst2 = 1;
 
  // Fill event information
  GenEvent* evt = new GenEvent( 1, 1 );
 
  GenVertex* prod_vtx = new GenVertex();
  //  prod_vtx->add_particle_out( p );
  evt->add_vertex( prod_vtx );
 
  // incoming beam e- HepLorentzVector(px,py,pz,energy) required!
  GenParticle* p =
      new GenParticle( CLHEP::HepLorentzVector( MOMSET.p1[1][evtgen], MOMSET.p1[2][evtgen],
                                                MOMSET.p1[3][evtgen], MOMSET.p1[0][evtgen] ),
                       11, 3 );
  p->suggest_barcode( ++npart );
  prod_vtx->add_particle_in( p );
 
  //  std::cout<<"incoming beam e+"<<endl;
  // incoming beam e+, e+ moving along the z-direction
  p = new GenParticle( CLHEP::HepLorentzVector( MOMSET.q1[1][evtgen], MOMSET.q1[2][evtgen],
                                                MOMSET.q1[3][evtgen], MOMSET.q1[4][evtgen] ),
                       -11, 3 );
 
  p->suggest_barcode( ++npart );
  prod_vtx->add_particle_in( p );
 
  // scattered lepton +
  p = new GenParticle( CLHEP::HepLorentzVector( MOMSET.p2[1][evtgen], MOMSET.p2[2][evtgen],
                                                MOMSET.p2[3][evtgen], MOMSET.p2[0][evtgen] ),
                       pid1, pst1 );
  p->suggest_barcode( ++npart );
  prod_vtx->add_particle_out( p );
 
  // scattered lepton -
  p = new GenParticle( CLHEP::HepLorentzVector( MOMSET.q2[1][evtgen], MOMSET.q2[2][evtgen],
                                                MOMSET.q2[3][evtgen], MOMSET.q2[0][evtgen] ),
                       pid2, pst2 );
  p->suggest_barcode( ++npart );
  prod_vtx->add_particle_out( p );
 
  // outgoing pi+
  p = new GenParticle( CLHEP::HepLorentzVector( MOMSET.p3[1][evtgen], MOMSET.p3[2][evtgen],
                                                MOMSET.p3[3][evtgen], MOMSET.p3[0][evtgen] ),
                       pid3, pst1 );
  p->suggest_barcode( ++npart );
  prod_vtx->add_particle_out( p );
 
  // outgoing pi-
  p = new GenParticle( CLHEP::HepLorentzVector( MOMSET.q3[1][evtgen], MOMSET.q3[2][evtgen],
                                                MOMSET.q3[3][evtgen], MOMSET.q3[0][evtgen] ),
                       pid4, pst2 );
  p->suggest_barcode( ++npart );
  prod_vtx->add_particle_out( p );
 
  evtgen++;
 
  if ( log.level() < MSG::INFO ) { evt->print(); }
 
  // Check if the McCollection already exists
  SmartDataPtr<McGenEventCol> anMcCol( eventSvc(), "/Event/Gen" );
  if ( anMcCol != 0 )
  {
    // Add event to existing collection
    MsgStream log( msgSvc(), name() );
    log << MSG::INFO << "Add McGenEvent to existing collection" << endmsg;
    McGenEvent* mcEvent = new McGenEvent( evt );
    anMcCol->push_back( mcEvent );
  }
  else
  {
    // Create Collection and add  to the transient store
    McGenEventCol* mcColl  = new McGenEventCol;
    McGenEvent*    mcEvent = new McGenEvent( evt );
    mcColl->push_back( mcEvent );
    StatusCode sc = eventSvc()->registerObject( "/Event/Gen", mcColl );
    if ( sc != StatusCode::SUCCESS )
    {
      log << MSG::ERROR << "Could not register McGenEvent" << endmsg;
      delete mcColl;
      delete evt;
      delete mcEvent;
      return StatusCode::FAILURE;
    }
    else
    {
      //   log << MSG::INFO << "McGenEventCol created and " << npart <<" particles stored in
      //   McGenEvent" << endmsg;
    }
  }
 
  return StatusCode::SUCCESS;
}
 
StatusCode Eepipi::finalize() {
  MsgStream log( msgSvc(), name() );
  char      delcmd[300];
  strcpy( delcmd, "cat " );
  strcat( delcmd, "fresult.dat" );
  system( delcmd );
 
  std::cout << "Eepipi finalized" << endl;
  return StatusCode::SUCCESS;
}
 
StatusCode Eepipi::getMaxEvent() {
  IProperty* appPropMgr = 0;
  StatusCode status =
      serviceLocator()->getService( "ApplicationMgr", IProperty::interfaceID(),
                                    reinterpret_cast<IInterface*&>( appPropMgr ) );
  if ( status.isFailure() ) return status;
 
  IntegerProperty evtMax( "EvtMax", 0 );
  status = appPropMgr->getProperty( &evtMax );
  if ( status.isFailure() ) return status;
 
  m_evtMax = evtMax.value();
  return status;
}