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 // ********************************************************************
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 //
 /// \file eventgenerator/pythia/decayer6/src/Pythia6.cc
 /// \brief Implementation of the Pythia6 class
 
 // ----------------------------------------------------------------------------
 // According to TPythia6 class from Root:
 // (The TPythia6 class is an interface class to F77 routines in Pythia6                //
 // CERNLIB event generators, written by T.Sjostrand.)
 // http://root.cern.ch/
 // see http://root.cern.ch/root/License.html
 //
 // The complete Pythia6 documentation can be found at:
 // http://home.thep.lu.se/~torbjorn/pythiaaux/recent.html
 // ----------------------------------------------------------------------------
 
 // ******************************************************************************
 // ******************************************************************************
 // **                                                                          **
 // **                                                                          **
 // **              *......*                  Welcome to the Lund Monte Carlo!  **
 // **         *:::!!:::::::::::*                                               **
 // **      *::::::!!::::::::::::::*          PPP  Y   Y TTTTT H   H III   A    **
 // **    *::::::::!!::::::::::::::::*        P  P  Y Y    T   H   H  I   A A   **
 // **   *:::::::::!!:::::::::::::::::*       PPP    Y     T   HHHHH  I  AAAAA  **
 // **   *:::::::::!!:::::::::::::::::*       P      Y     T   H   H  I  A   A  **
 // **    *::::::::!!::::::::::::::::*!       P      Y     T   H   H III A   A  **
 // **      *::::::!!::::::::::::::* !!                                         **
 // **      !! *:::!!:::::::::::*    !!       This is PYTHIA version 6.418      **
 // **      !!     !* -><- *         !!       Last date of change:  9 Jun 2008  **
 // **      !!     !!                !!                                         **
 // **      !!     !!                !!       Now is  0 Jan 2000 at  0:00:00    **
 // **      !!                       !!                                         **
 // **      !!        lh             !!       Disclaimer: this program comes    **
 // **      !!                       !!       without any guarantees. Beware    **
 // **      !!                 hh    !!       of errors and use common sense    **
 // **      !!    ll                 !!       when interpreting results.        **
 // **      !!                       !!                                         **
 // **      !!                                Copyright T. Sjostrand (2008)     **
 // **                                                                          **
 // ** An archive of program versions and documentation is found on the web:    **
 // ** http://www.thep.lu.se/~torbjorn/Pythia.html                              **
 // **                                                                          **
 // ** When you cite this program, the official reference is to the 6.4 manual: **
 // ** T. Sjostrand, S. Mrenna and P. Skands, JHEP05 (2006) 026                 **
 // ** (LU TP 06-13, FERMILAB-PUB-06-052-CD-T) [hep-ph/0603175].                **
 // **                                                                          **
 // ** Also remember that the program, to a large extent, represents original   **
 // ** physics research. Other publications of special relevance to your        **
 // ** studies may therefore deserve separate mention.                          **
 // **                                                                          **
 // ** Main author: Torbjorn Sjostrand; Department of Theoretical Physics,      **
 // **   Lund University, Solvegatan 14A, S-223 62 Lund, Sweden;                **
 // **   phone: + 46 - 46 - 222 48 16; e-mail: torbjorn@thep.lu.se              **
 // ** Author: Stephen Mrenna; Computing Division, GDS Group,                   **
 // **   Fermi National Accelerator Laboratory, MS 234, Batavia, IL 60510, USA; **
 // **   phone: + 1 - 630 - 840 - 2556; e-mail: mrenna@fnal.gov                 **
 // ** Author: Peter Skands; Theoretical Physics Department,                    **
 // **   Fermi National Accelerator Laboratory, MS 106, Batavia, IL 60510, USA; **
 // **   and CERN/PH, CH-1211 Geneva, Switzerland;                              **
 // **   phone: + 41 - 22 - 767 24 59; e-mail: skands@fnal.gov                  **
 // **                                                                          **
 // **                                                                          **
 // ******************************************************************************
 
 #include "Pythia6.hh"
 
 #include <cstdlib>
 #include <cstring>
 #include <iostream>
 
 #ifndef WIN32
 #  define pycomp pycomp_
 #  define py1ent py1ent_
 #  define type_of_call
 #else
 #  define pycomp PYCOMP
 #  define py1ent PY1ENT
 #  define type_of_call _stdcall
 #endif
 
 // pythia6 functions
 extern "C"
 {
   int type_of_call pycomp(int* kf);
   void type_of_call py1ent(int&, int&, double&, double&, double&);
   void* pythia6_common_address(const char*);
 }
 
 // Direct declaration of pythia6 common blocks
 // extern "C" {
 //   extern Pyjets_t pyjets_;
 //   extern Pydat1_t pydat1_;
 //   extern Pydat3_t pydat3_;
 // }
 
 Pythia6* Pythia6::fgInstance = 0;
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
 Pythia6* Pythia6::Instance()
 {
   /// Static access method
 
   if (!fgInstance) fgInstance = new Pythia6();
 
   return fgInstance;
 }
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
 Pythia6::Pythia6() : fParticles(0), fPyjets(0), fPydat1(0), fPydat3(0)
 {
   /// Pythia6 constructor: creates a vector of Pythia6Particle in which it will
   /// store all particles. Note that there may be only one functional Pythia6
   /// object at a time, so it's not use to create more than one instance of it.
 
   // Protect against multiple objects.   All access should be via the
   // Instance member function.
   if (fgInstance) {
     std::cerr << "There's already an instance of Pythia6" << std::endl;
     exit(1);
   }
 
   fParticles = new ParticleVector();
 
   // Initialize common-blocks
   fPyjets = (Pyjets_t*)pythia6_common_address("PYJETS");
   fPydat1 = (Pydat1_t*)pythia6_common_address("PYDAT1");
   fPydat3 = (Pydat3_t*)pythia6_common_address("PYDAT3");
 
   // Alternative way to initialize common-blocks
   // usind direct declaration of pythia6 common blocks
   // fPyjets = &pyjets_;
   // fPydat1 = &pydat1_;
   // fPydat3 = &pydat3_;
 }
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
 Pythia6::~Pythia6()
 {
   /// Destroy the object, delete and dispose all Pythia6Particles currently on
   /// list.
 
   if (fParticles) {
     ParticleVector::const_iterator it;
     for (it = fParticles->begin(); it != fParticles->end(); it++)
       delete *it;
     delete fParticles;
   }
 }
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
 int Pythia6::Pycomp(int kf)
 {
   /// Interface with fortran routine pycomp
 
   return pycomp(&kf);
 }
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
 void Pythia6::Py1ent(int ip, int kf, double pe, double theta, double phi)
 {
   /// Add one entry to the event record, i.e. either a parton or a
   /// particle.
   ///
   ///  IP:   normally line number for the parton/particle. There are two
   ///        exceptions:
   ///
   ///        If IP = 0: line number 1 is used and PYEXEC is called.
   ///        If IP < 0: line -IP is used, with status code K(-IP,2)=2
   ///                   rather than 1; thus a parton system may be built
   ///                   up by filling all but the last parton of the
   ///                   system with IP < 0.
   ///  KF:   parton/particle flavour code (PDG code)
   ///  PE:   parton/particle energy. If PE is smaller than the mass,
   ///        the parton/particle is taken to be at rest.
   ///  THETA:
   ///  PHI:  polar and azimuthal angle for the momentum vector of the
   ///        parton/particle.
 
   py1ent(ip, kf, pe, theta, phi);
 }
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
 int Pythia6::ImportParticles(ParticleVector* particles, const char* option)
 {
   ///  Default primary creation method. It reads the /HEPEVT/ common block which
   ///  has been filled by the GenerateEvent method. If the event generator does
   ///  not use the HEPEVT common block, This routine has to be overloaded by
   ///  the subclasses.
   ///  The function loops on the generated particles and store them in
   ///  the TClonesArray pointed by the argument particles.
   ///  The default action is to store only the stable particles (ISTHEP = 1)
   ///  This can be demanded explicitly by setting the option = "Final"
   ///  If the option = "All", all the particles are stored.
 
   if (particles == 0) return 0;
 
   ParticleVector::const_iterator it;
   for (it = particles->begin(); it != particles->end(); it++)
     delete *it;
   particles->clear();
 
   int numpart = fPyjets->N;
   int nparts = 0;
   if (!strcmp(option, "") || !strcmp(option, "Final")) {
     for (int i = 0; i < numpart; i++) {
       if (fPyjets->K[0][i] == 1) {
         //
         //  Use the common block values for the TParticle constructor
         //
         particles->push_back(new Pythia6Particle(
           fPyjets->K[0][i], fPyjets->K[1][i], fPyjets->K[2][i], fPyjets->K[3][i], fPyjets->K[4][i],
           fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i], fPyjets->P[4][i],
           fPyjets->V[0][i], fPyjets->V[1][i], fPyjets->V[2][i], fPyjets->V[3][i],
           fPyjets->V[4][i]));
 
         //     if(gDebug) printf("%d %d %d! ",i,fPyjets->K[1][i],numpart);
         nparts++;
       }
     }
   }
   else if (!strcmp(option, "All")) {
     for (int i = 0; i < numpart; i++) {
       particles->push_back(new Pythia6Particle(
         fPyjets->K[0][i], fPyjets->K[1][i], fPyjets->K[2][i], fPyjets->K[3][i], fPyjets->K[4][i],
         fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i], fPyjets->P[4][i],
         fPyjets->V[0][i], fPyjets->V[1][i], fPyjets->V[2][i], fPyjets->V[3][i], fPyjets->V[4][i]));
     }
     nparts = numpart;
   }
 
   return nparts;
 }
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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