Cascade2Hadronizer.cc

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#include "GeneratorInterface/CascadeInterface/plugins/Cascade2Hadronizer.h"

#include <memory>

#include "HepMC/GenEvent.h"
#include "HepMC/PdfInfo.h"
#include "HepMC/PythiaWrapper6_4.h"
#include "GeneratorInterface/CascadeInterface/plugins/CascadeWrapper.h"

#include "HepMC/HEPEVT_Wrapper.h"
#include "HepMC/IO_HEPEVT.h"
#include "HepMC/IO_GenEvent.h"

#include "FWCore/Concurrency/interface/SharedResourceNames.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "GeneratorInterface/Core/interface/FortranCallback.h"
#include "GeneratorInterface/Core/interface/FortranInstance.h"

HepMC::IO_HEPEVT hepevtio;

#include "HepPID/ParticleIDTranslations.hh"

#include "FWCore/Utilities/interface/EDMException.h"

//-- Pythia6 routines and functionalities to pass around Pythia6 params

#include "GeneratorInterface/Pythia6Interface/interface/Pythia6Service.h"
#include "GeneratorInterface/Pythia6Interface/interface/Pythia6Declarations.h"

#include "SimDataFormats/GeneratorProducts/interface/GenRunInfoProduct.h"

#include "CLHEP/Random/RandomEngine.h"

using namespace edm;
using namespace std;

#define debug 0

static CLHEP::HepRandomEngine* cascade2RandomEngine;

extern "C" {

double dcasrn_(int* idummy) {
  static int call = 0;

  double rdm_nb = cascade2RandomEngine->flat();

  if (debug && ++call < 100)
    cout << "dcasrn from c++, call: " << call << " random number: " << rdm_nb << endl;

  return rdm_nb;
}
}

namespace gen {

  class Pythia6ServiceWithCallback : public Pythia6Service {
  public:
    Pythia6ServiceWithCallback(const edm::ParameterSet& pset) : Pythia6Service(pset) {}

  private:
    void upInit() override { FortranCallback::getInstance()->fillHeader(); }

    void upEvnt() override { FortranCallback::getInstance()->fillEvent(); }

    bool upVeto() override {
      bool veto = false;
      if (!hepeup_.nup)
        veto = true;  //-- LHE Common Blocks
      return (veto);
    }
  };

  static struct {
    int n, npad, k[5][pyjets_maxn];
    double p[5][pyjets_maxn], v[5][pyjets_maxn];
  } pyjets_local;

  const std::vector<std::string> Cascade2Hadronizer::theSharedResources = {edm::SharedResourceNames::kPythia6,
                                                                           gen::FortranInstance::kFortranInstance};

  Cascade2Hadronizer::Cascade2Hadronizer(edm::ParameterSet const& pset)
      : BaseHadronizer(pset),
        fPy6Service(new Pythia6ServiceWithCallback(pset)),  //-- this will store py6 parameters for further settings

        fComEnergy(pset.getParameter<double>("comEnergy")),
        fextCrossSection(pset.getUntrackedParameter<double>("crossSection", -1.)),
        fextCrossSectionError(pset.getUntrackedParameter<double>("crossSectionError", -1.)),
        fFilterEfficiency(pset.getUntrackedParameter<double>("filterEfficiency", -1.)),

        fMaxEventsToPrint(pset.getUntrackedParameter<int>("maxEventsToPrint", 0)),
        fHepMCVerbosity(pset.getUntrackedParameter<bool>("pythiaHepMCVerbosity", false)),
        fPythiaListVerbosity(pset.getUntrackedParameter<int>("pythiaPylistVerbosity", 0)),

        fDisplayPythiaBanner(pset.getUntrackedParameter<bool>("displayPythiaBanner", false)),
        fDisplayPythiaCards(pset.getUntrackedParameter<bool>("displayPythiaCards", false)) {
    fParameters = pset.getParameter<ParameterSet>("Cascade2Parameters");

    fConvertToPDG = false;
    if (pset.exists("doPDGConvert"))
      fConvertToPDG = pset.getParameter<bool>("doPDGConvert");

    //-- silence Pythia6 banner printout, unless display requested

    if (!fDisplayPythiaBanner) {
      if (!call_pygive("MSTU(12)=12345")) {
        throw edm::Exception(edm::errors::Configuration, "PythiaError") << " Pythia did not accept MSTU(12)=12345";
      }
    }

    //-- silence printouts from PYGIVE, unless display requested

    if (!fDisplayPythiaCards) {
      if (!call_pygive("MSTU(13)=0")) {
        throw edm::Exception(edm::errors::Configuration, "PythiaError") << " Pythia did not accept MSTU(13)=0";
      }
    }

    //-- tmp stuff to deal with EvtGen corrupting pyjets
    flushTmpStorage();
  }

  Cascade2Hadronizer::~Cascade2Hadronizer() {
    if (fPy6Service != nullptr)
      delete fPy6Service;
  }

  void Cascade2Hadronizer::doSetRandomEngine(CLHEP::HepRandomEngine* v) {
    cascade2RandomEngine = v;
    fPy6Service->setRandomEngine(v);
  }

  void Cascade2Hadronizer::flushTmpStorage() {
    pyjets_local.n = 0;
    pyjets_local.npad = 0;

    for (int ip = 0; ip < pyjets_maxn; ip++) {
      for (int i = 0; i < 5; i++) {
        pyjets_local.k[i][ip] = 0;
        pyjets_local.p[i][ip] = 0.;
        pyjets_local.v[i][ip] = 0.;
      }
    }
    return;
  }

  void Cascade2Hadronizer::fillTmpStorage() {
    pyjets_local.n = pyjets.n;
    pyjets_local.npad = pyjets.npad;

    for (int ip = 0; ip < pyjets_maxn; ip++) {
      for (int i = 0; i < 5; i++) {
        pyjets_local.k[i][ip] = pyjets.k[i][ip];
        pyjets_local.p[i][ip] = pyjets.p[i][ip];
        pyjets_local.v[i][ip] = pyjets.v[i][ip];
      }
    }
    return;
  }

  void Cascade2Hadronizer::finalizeEvent() {
    HepMC::PdfInfo pdf;

    //-- filling factorization "Q scale" now! pthat moved to binningValues()

    if (event()->signal_process_id() <= 0)
      event()->set_signal_process_id(pypars.msti[0]);
    if (event()->event_scale() <= 0)
      event()->set_event_scale(pypars.pari[22]);
    if (event()->alphaQED() <= 0)
      event()->set_alphaQED(pyint1.vint[56]);
    if (event()->alphaQCD() <= 0)
      event()->set_alphaQCD(pyint1.vint[57]);

    //-- get pdf info directly from Pythia6 and set it up into HepMC::GenEvent
    //-- S. Mrenna: Prefer vint block

    if (pdf.id1() <= 0)
      pdf.set_id1(pyint1.mint[14] == 21 ? 0 : pyint1.mint[14]);
    if (pdf.id2() <= 0)
      pdf.set_id2(pyint1.mint[15] == 21 ? 0 : pyint1.mint[15]);
    if (pdf.x1() <= 0)
      pdf.set_x1(pyint1.vint[40]);
    if (pdf.x2() <= 0)
      pdf.set_x2(pyint1.vint[41]);
    if (pdf.pdf1() <= 0)
      pdf.set_pdf1(pyint1.vint[38] / pyint1.vint[40]);
    if (pdf.pdf2() <= 0)
      pdf.set_pdf2(pyint1.vint[39] / pyint1.vint[41]);
    if (pdf.scalePDF() <= 0)
      pdf.set_scalePDF(pyint1.vint[50]);

    event()->set_pdf_info(pdf);

    if (debug) {
      cout << "standard Py6 event weight: pyint1.vint[96]: " << pyint1.vint[96] << endl;
      cout << "event weight returned by PYEVWT: 1./(pyint1.vint[98]): " << 1. / (pyint1.vint[98]) << endl;
    }

    //-- this is "standard" Py6 event weight (corresponds to PYINT1/VINT(97))
    // event()->weights().push_back(pyint1.vint[96]);

    //-- this is event weight as 1./VINT(99) (PYINT1/VINT(99) is returned by the PYEVWT)
    // event()->weights().push_back(1./(pyint1.vint[98]));

    //-- all cascade events have weight = 1
    event()->weights().push_back(1.);

    //-- now create the GenEventInfo product from the GenEvent and fill the missing pieces

    eventInfo() = std::make_unique<GenEventInfoProduct>(event().get());

    //-- in Pythia6 pthat is used to subdivide samples into different bins
    //-- in LHE mode the binning is done by the external ME generator
    //-- which is likely not pthat, so only filling it for Py6 internal mode

    eventInfo()->setBinningValues(vector<double>(1, pypars.pari[16]));

    //-- here we treat long-lived particles

    if (pydat1.mstj[21] == 3 || pydat1.mstj[21] == 4)
      imposeProperTime();

    //-- convert particle IDs Py6 -> PDG (if requested)

    if (fConvertToPDG) {
      for (HepMC::GenEvent::particle_iterator part = event()->particles_begin(); part != event()->particles_end();
           ++part) {
        (*part)->set_pdg_id(HepPID::translatePythiatoPDT((*part)->pdg_id()));
      }
    }

    //-- service printouts, if requested
    if (fMaxEventsToPrint > 0) {
      fMaxEventsToPrint--;
      if (fPythiaListVerbosity)
        call_pylist(fPythiaListVerbosity);
      if (fHepMCVerbosity) {
        cout << "Event process = " << pypars.msti[0] << endl << "----------------------" << endl;
        event()->print();
      }
    }

    return;
  }

  bool Cascade2Hadronizer::hadronize() { return false; }

  bool Cascade2Hadronizer::generatePartonsAndHadronize() {
    //-- grab Py6 instance
    Pythia6Service::InstanceWrapper guard(fPy6Service);

    FortranCallback::getInstance()->resetIterationsPerEvent();

    //-- skip event if py6 considers it bad
    if (pyint1.mint[50] != 0) {
      event().reset();
      return false;
    }

    //-- generation of the event with CASCADE
    call_event();

    //-- pythia pyhepc routine converts common PYJETS in common HEPEVT
    call_pyhepc(1);

    //-- delete the created event from memory
    event().reset(hepevtio.read_next_event());

    //-- this is to deal with post-gen tools & residualDecay() that may reuse PYJETS
    flushTmpStorage();
    fillTmpStorage();

    return true;
  }

  bool Cascade2Hadronizer::decay() { return true; }

  bool Cascade2Hadronizer::residualDecay() {
    //-- grab Py6 instance
    Pythia6Service::InstanceWrapper guard(fPy6Service);

    int NPartsBeforeDecays = pyjets_local.n;
    int NPartsAfterDecays = event().get()->particles_size();
    int barcode = NPartsAfterDecays;

    // JVY: well, in principle, it's not a 100% fair to go up to NPartsBeforeDecays,
    // because Photos will attach gamma's to existing vertices, i.e. in the middle
    // of the event rather than at the end; but this will only shift pointers down,
    // so we'll be going again over a few "original" particle...
    // in the alternative, we may go all the way up to the beginning of the event
    // and re-check if anything remains to decay, that's fine even if it'll take
    // some extra CPU...

    for (int ipart = NPartsAfterDecays; ipart > NPartsBeforeDecays; ipart--) {
      HepMC::GenParticle* part = event().get()->barcode_to_particle(ipart);
      int status = part->status();
      if (status != 1)
        continue;  // check only "stable" particles,
                   // as some undecayed may still be marked as such
      int pdgid = part->pdg_id();
      int py6ptr = pycomp_(pdgid);

      if (pydat3.mdcy[0][py6ptr - 1] != 1)
        continue;  // particle is not expected to decay

      int py6id = HepPID::translatePDTtoPythia(pdgid);

      // first, will need to zero out, then fill up PYJETS
      // I better do it directly (by hands) rather than via py1ent
      // - to avoid (additional) mass smearing

      if (part->momentum().t() <= part->generated_mass()) {
        continue;  // e == m -> 0-momentum, nothing to decay...
      }

      else {
        pyjets.n = 0;

        for (int i = 0; i < 5; i++) {
          pyjets.k[i][0] = 0;
          pyjets.p[i][0] = 0.;
          pyjets.v[i][0] = 0.;
        }

        pyjets.k[0][0] = 1;
        pyjets.k[1][0] = py6id;
        pyjets.p[4][0] = part->generated_mass();
        pyjets.p[3][0] = part->momentum().t();
        pyjets.p[0][0] = part->momentum().x();
        pyjets.p[1][0] = part->momentum().y();
        pyjets.p[2][0] = part->momentum().z();
        HepMC::GenVertex* prod_vtx = part->production_vertex();
        if (!prod_vtx)
          continue;  // in principle, should never happen but...
        pyjets.v[0][0] = prod_vtx->position().x();
        pyjets.v[1][0] = prod_vtx->position().y();
        pyjets.v[2][0] = prod_vtx->position().z();
        pyjets.v[3][0] = prod_vtx->position().t();
        pyjets.v[4][0] = 0.;
        pyjets.n = 1;
        pyjets.npad = pyjets_local.npad;
      }

      //-- now call Py6 decay routine

      int parent = 1;  // since we always pass to Py6 a single particle
      pydecy_(parent);

      //-- now attach decay products to mother

      for (int iprt1 = 1; iprt1 < pyjets.n; iprt1++) {
        part->set_status(2);

        HepMC::GenVertex* DecVtx = new HepMC::GenVertex(
            HepMC::FourVector(pyjets.v[0][iprt1], pyjets.v[1][iprt1], pyjets.v[2][iprt1], pyjets.v[3][iprt1]));
        DecVtx->add_particle_in(part);  // this will cleanup end_vertex if exists, replace with the new one
        // I presume (vtx) barcode will be given automatically

        HepMC::FourVector pmom(pyjets.p[0][iprt1], pyjets.p[1][iprt1], pyjets.p[2][iprt1], pyjets.p[3][iprt1]);

        int dstatus = 0;
        if (pyjets.k[0][iprt1] >= 1 && pyjets.k[0][iprt1] <= 10)
          dstatus = 1;
        else if (pyjets.k[0][iprt1] >= 11 && pyjets.k[0][iprt1] <= 20)
          dstatus = 2;
        else if (pyjets.k[0][iprt1] >= 21 && pyjets.k[0][iprt1] <= 30)
          dstatus = 3;
        else if (pyjets.k[0][iprt1] >= 31 && pyjets.k[0][iprt1] <= 100)
          dstatus = pyjets.k[0][iprt1];

        HepMC::GenParticle* daughter =
            new HepMC::GenParticle(pmom, HepPID::translatePythiatoPDT(pyjets.k[1][iprt1]), dstatus);
        barcode++;
        daughter->suggest_barcode(barcode);
        DecVtx->add_particle_out(daughter);

        int iprt2;
        for (iprt2 = iprt1 + 1; iprt2 < pyjets.n; iprt2++) {  // the pointer is shifted by -1, c++ style

          if (pyjets.k[2][iprt2] != parent) {
            parent = pyjets.k[2][iprt2];
            break;  // another parent particle; reset & break the loop
          }

          HepMC::FourVector pmomN(pyjets.p[0][iprt2], pyjets.p[1][iprt2], pyjets.p[2][iprt2], pyjets.p[3][iprt2]);

          dstatus = 0;
          if (pyjets.k[0][iprt2] >= 1 && pyjets.k[0][iprt2] <= 10)
            dstatus = 1;
          else if (pyjets.k[0][iprt2] >= 11 && pyjets.k[0][iprt2] <= 20)
            dstatus = 2;
          else if (pyjets.k[0][iprt2] >= 21 && pyjets.k[0][iprt2] <= 30)
            dstatus = 3;
          else if (pyjets.k[0][iprt2] >= 31 && pyjets.k[0][iprt2] <= 100)
            dstatus = pyjets.k[0][iprt2];

          HepMC::GenParticle* daughterN =
              new HepMC::GenParticle(pmomN, HepPID::translatePythiatoPDT(pyjets.k[1][iprt2]), dstatus);
          barcode++;
          daughterN->suggest_barcode(barcode);
          DecVtx->add_particle_out(daughterN);
        }  //-- end iprt2 loop

        iprt1 = iprt2 - 1;  // reset counter such that it doesn't go over the same child more than once
        // don't forget to offset back into c++ counting, as it's already +1 forward

        event().get()->add_vertex(DecVtx);
      }  //-- end iprt1 loop
    }    //-- end loop over decay products

    // now restore the very original Py6 event record

    if (pyjets_local.n != pyjets.n) {
      // restore pyjets to its state as it was before external decays -
      // might have been jammed by action above or by py1ent calls in EvtGen

      pyjets.n = pyjets_local.n;
      pyjets.npad = pyjets_local.npad;
      for (int ip = 0; ip < pyjets_local.n; ip++) {
        for (int i = 0; i < 5; i++) {
          pyjets.k[i][ip] = pyjets_local.k[i][ip];
          pyjets.p[i][ip] = pyjets_local.p[i][ip];
          pyjets.v[i][ip] = pyjets_local.v[i][ip];
        }
      }
    }

    return true;
  }

  bool Cascade2Hadronizer::readSettings(int key) {
    //-- grab Py6 instance
    Pythia6Service::InstanceWrapper guard(fPy6Service);

    fPy6Service->setGeneralParams();

    if (key == 0)
      fPy6Service->setCSAParams();
    fPy6Service->setSLHAParams();

    return true;
  }

  bool Cascade2Hadronizer::initializeForExternalPartons() { return false; }

  bool Cascade2Hadronizer::initializeForInternalPartons() {
    //-- grab Py6 instance
    Pythia6Service::InstanceWrapper guard(fPy6Service);

    //-- change standard parameters of JETSET/PYTHIA - replace call_pytcha()

    fPy6Service->setGeneralParams();

    fPy6Service->setCSAParams();
    fPy6Service->setSLHAParams();
    fPy6Service->setPYUPDAParams(false);

    pythia6PrintParameters();

    //-- mstu(8) is set to NMXHEP in this dummy call (version >=6.404)
    call_pyhepc(1);

    //-- initialise random number generator: has been changed to be CMSSW compliant
    //-- dcasrn overloaded: call to rluxgo not needed anymore
    //-- call_rluxgo(4,314159265,0,0);

    //-- initialise CASCADE parameters (default values)
    call_casini();

    //-- Read the parameters and pass them to the common blocks
    //-- call_steer();

    //-- initialise CASCADE parameters (user values)

    //-- retrieve all the different sets
    vector<string> AllSets = fParameters.getParameter<vector<string> >("parameterSets");

    //-- loop over the different sets
    for (unsigned i = 0; i < AllSets.size(); ++i) {
      string Set = AllSets[i];
      vector<string> Para_Set = fParameters.getParameter<vector<string> >(Set);

      //-- loop over all the parameters and stop in case of mistake
      for (vector<string>::const_iterator itPara = Para_Set.begin(); itPara != Para_Set.end(); ++itPara) {
        if (!cascadeReadParameters(*itPara)) {
          throw edm::Exception(edm::errors::Configuration, "CascadeError")
              << " Cascade did not accept the following parameter: \"" << *itPara << "\"" << endl;
        }
      }  //-- end loop over all the parameters
    }    //-- end loop over the different sets

    cainpu.plepin = -fComEnergy / 2;
    cainpu.ppin = fComEnergy / 2;

    cascadePrintParameters();

    //-- change standard parameters of CASCADE
    call_cascha();

    //-- change standard parameters of JETSET/PYTHIA
    //-- call_pytcha();

    //-- set up for running CASCADE (integration of the cross-section)
    call_cascade();

    //-- print cross-section result from integration
    call_caend(1);

    fPy6Service->setPYUPDAParams(true);

    fPy6Service->closeSLHA();

    return true;
  }

  bool Cascade2Hadronizer::declareStableParticles(const vector<int>& _pdg) {
    vector<int> pdg = _pdg;
    for (size_t i = 0; i < pdg.size(); i++) {
      int PyID = HepPID::translatePDTtoPythia(pdg[i]);
      int pyCode = pycomp_(PyID);

      if (pyCode > 0) {
        ostringstream pyCard;
        pyCard << "MDCY(" << pyCode << ",1)=0";
        //-- cout << "pdg= " << pdg[i] << " " << pyCard.str() << endl;

        call_pygive(pyCard.str());
      }
    }

    return true;
  }

  void Cascade2Hadronizer::imposeProperTime() {
    // this is practically a copy/paste of the original code by J.Alcaraz,
    // taken directly from PythiaSource

    int dumm = 0;
    HepMC::GenEvent::vertex_const_iterator vbegin = event()->vertices_begin();
    HepMC::GenEvent::vertex_const_iterator vend = event()->vertices_end();
    HepMC::GenEvent::vertex_const_iterator vitr = vbegin;

    for (; vitr != vend; ++vitr) {
      HepMC::GenVertex::particle_iterator pbegin = (*vitr)->particles_begin(HepMC::children);
      HepMC::GenVertex::particle_iterator pend = (*vitr)->particles_end(HepMC::children);
      HepMC::GenVertex::particle_iterator pitr = pbegin;

      for (; pitr != pend; ++pitr) {
        if ((*pitr)->end_vertex())
          continue;
        if ((*pitr)->status() != 1)
          continue;

        int pdgcode = abs((*pitr)->pdg_id());
        // Do nothing if the particle is not expected to decay
        if (pydat3.mdcy[0][pycomp_(pdgcode) - 1] != 1)
          continue;

        double ctau = pydat2.pmas[3][pycomp_(pdgcode) - 1];
        HepMC::FourVector mom = (*pitr)->momentum();
        HepMC::FourVector vin = (*vitr)->position();
        double x = 0.;
        double y = 0.;
        double z = 0.;
        double t = 0.;
        bool decayInRange = false;
        while (!decayInRange) {
          double unif_rand = fPy6Service->call(pyr_, &dumm);
          // Value of 0 is excluded, so following line is OK
          double proper_length = -ctau * log(unif_rand);
          double factor = proper_length / mom.m();
          x = vin.x() + factor * mom.px();
          y = vin.y() + factor * mom.py();
          z = vin.z() + factor * mom.pz();
          t = vin.t() + factor * mom.e();

          // Decay must be happen outside a cylindrical region
          if (pydat1.mstj[21] == 4) {
            if (sqrt(x * x + y * y) > pydat1.parj[72] || fabs(z) > pydat1.parj[73])
              decayInRange = true;
            // Decay must be happen outside a given sphere
          } else if (pydat1.mstj[21] == 3) {
            if (sqrt(x * x + y * y + z * z) > pydat1.parj[71])
              decayInRange = true;
          }
          // Decay is always OK otherwise
          else {
            decayInRange = true;
          }
        }

        HepMC::GenVertex* vdec = new HepMC::GenVertex(HepMC::FourVector(x, y, z, t));
        event()->add_vertex(vdec);
        vdec->add_particle_in((*pitr));
      }
    }

    return;
  }

  void Cascade2Hadronizer::statistics() {
    runInfo().setExternalXSecLO(GenRunInfoProduct::XSec(fextCrossSection, fextCrossSectionError));

    runInfo().setExternalXSecNLO(GenRunInfoProduct::XSec(-1., -1.));

    if (!runInfo().internalXSec()) {
      double sigma_CMS = 0.001 * caeffic.avgi;
      double error_CMS = 0.001 * caeffic.sd;
      runInfo().setInternalXSec(GenRunInfoProduct::XSec(sigma_CMS, error_CMS));
    }

    //--  print out generated event summary
    call_caend(2);

    //-- write out some information from Pythia to the screen
    call_pystat(1);

    return;
  }

  const char* Cascade2Hadronizer::classname() const { return "gen::Cascade2Hadronizer"; }

  //-- Read the parameters and pass them to the common blocks

  bool Cascade2Hadronizer::cascadeReadParameters(const string& ParameterString) {
    bool accepted = true;

    if (!strncmp(ParameterString.c_str(), "KE", 2))
      caluco.ke = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IRES(1)", 7))
      capar6.ires[0] = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "KP", 2))
      caluco.kp = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IRES(2)", 7))
      capar6.ires[1] = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "NFRAG", 5))
      cainpu.nfrag = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IPST", 4))
      cashower.ipst = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IPSIPOL", 7))
      jpsi.ipsipol = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    //-- from version 2.2.03 on
    // else if(!strncmp(ParameterString.c_str(),"I23S",4))
    //  jpsi.i23s = atoi(&ParameterString[strcspn(ParameterString.c_str(),"=")+1]);

    else if (!strncmp(ParameterString.c_str(), "IFPS", 4))
      cainpu.ifps = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "ITIMSHR", 7))
      casshwr.itimshr = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IRUNAEM", 7))
      capar1.irunaem = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IRUNA", 5))
      capar1.iruna = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IQ2", 3))
      capar1.iq2 = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IPRO", 4))
      capar1.ipro = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "NFLAV", 5))
      caluco.nflav = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "INTER", 5))
      cainpu.inter = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IHFLA", 5))
      cahflav.ihfla = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IRPA", 4))
      cascol.irpa = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IRPB", 4))
      cascol.irpb = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IRPC", 4))
      cascol.irpc = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "ICCFM", 5))
      casshwr.iccfm = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IFINAL", 6))
      cainpu.ifinal = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IGLU", 4))
      cagluon.iglu = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "IRspl", 5))
      casprre.irspl = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "PT2CUT", 6))
      captcut.pt2cut[capar1.ipro - 1] = atof(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "NCB", 3))
      integr.ncb = atoi(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "ACC1", 4))
      integr.acc1 = atof(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "ACC2", 4))
      integr.acc2 = atof(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "SCALFAF", 7))
      scalf.scalfaf = atof(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else if (!strncmp(ParameterString.c_str(), "SCALFA", 6))
      scalf.scalfa = atof(&ParameterString[strcspn(ParameterString.c_str(), "=") + 1]);

    else
      accepted = false;

    return accepted;
  }

  void Cascade2Hadronizer::cascadePrintParameters() {
    cout << "" << endl;
    cout << "----------------------------------" << endl;
    cout << "----    Cascade Parameters    ----" << endl;
    cout << "----------------------------------" << endl;
    cout << "" << endl;

    cout << "computation switch: " << endl;
    cout << "number of calls per iteration for bases: " << integr.ncb << endl;
    cout << "relative precision for grid optimisation: " << integr.acc1 << " %" << endl;
    cout << "relative precision for integration: " << integr.acc2 << " %" << endl;
    cout << "" << endl;

    cout << "kinematics: " << endl;
    cout << "flavour code of beam 1: " << caluco.ke << endl;
    cout << "direct or resolved particle 1: " << capar6.ires[0] << endl;
    cout << "pz of incoming beam 1: " << cainpu.plepin << " GeV" << endl;
    cout << "flavour code of beam 2: " << caluco.kp << endl;
    cout << "direct or resolved particle 2: " << capar6.ires[1] << endl;
    cout << "pz of incoming beam 2: " << cainpu.ppin << " GeV" << endl;
    cout << "number of active flavors: " << caluco.nflav << endl;
    cout << "" << endl;

    cout << "hard subprocess selection: " << endl;
    cout << "hard subprocess number (IPRO): " << capar1.ipro << endl;
    cout << "IPRO = 10, switch to select QCD process g* g* -> q qbar: " << cascol.irpa << endl;
    cout << "IPRO = 10, switch to select QCD process g* g -> g g: " << cascol.irpb << endl;
    cout << "IPRO = 10, switch to select QCD process g* q -> g q: " << cascol.irpc << endl;
    cout << "flavor of heavy quark produced (IPRO = 11, 504, 514): " << cahflav.ihfla << endl;
    // cout<<"select vector meson state: "<<jpsi.i23s<<endl;
    cout << "use matrix element including J/psi (Upsilon) polarisation: " << jpsi.ipsipol << endl;
    cout << "pt2 cut in matrix element for massless partons: " << captcut.pt2cut[capar1.ipro - 1] << " GeV^2" << endl;
    cout << "" << endl;

    cout << "parton shower and fragmentation: " << endl;
    cout << "switch for fragmentation: " << cainpu.nfrag << endl;
    cout << "switch for parton shower (0 off - 1 initial state - 2 final state - 3 initial & final state): "
         << cainpu.ifps << endl;
    cout << "switch for time like parton shower in initial state: " << casshwr.itimshr << endl;
    cout << "select CCFM (1) or DGLAP (0) evolution: " << casshwr.iccfm << endl;
    cout << "scale switch for final state parton shower: " << cainpu.ifinal << endl;
    cout << "scale factor for final state parton shower: " << scalf.scalfaf << endl;
    cout << "switch for proton remnant treatment: " << casprre.irspl << endl;
    cout << "keep track of intermediate state in parton shower: " << cashower.ipst << endl;
    cout << "mode of interaction for e p: " << cainpu.inter << endl;
    cout << "" << endl;

    cout << "pdfs, couplings and scales: " << endl;
    cout << "switch for running alphaem: " << capar1.irunaem << endl;
    cout << "switch for running alphas: " << capar1.iruna << endl;
    cout << "scale in alphas: " << capar1.iq2 << endl;
    cout << "scale factor for scale in alphas: " << scalf.scalfa << endl;
    cout << "unintegrated pdf: " << cagluon.iglu << endl;
    cout << "path where updf are stored: " << caspdf.pdfpath << endl;
    cout << "" << endl;

    cout << "center of mass energy, cross section, filter efficiency: " << endl;
    cout << "center of mass energy: " << fComEnergy << " GeV" << endl;
    cout << "external LO cross section: " << fextCrossSection << " +/- " << fextCrossSectionError << " pb" << endl;
    cout << "filter efficiency: " << fFilterEfficiency << endl;
    cout << "" << endl;
  }

  void Cascade2Hadronizer::pythia6PrintParameters() {
    cout << "" << endl;
    cout << "----------------------------------" << endl;
    cout << "----    Pythia6 Parameters    ----" << endl;
    cout << "----------------------------------" << endl;
    cout << "" << endl;

    cout << "charm mass: " << pydat2.pmas[0][3] << " GeV (default value =  1.5 GeV)" << endl;
    cout << "bottom mass: " << pydat2.pmas[0][4] << " GeV (default value = 4.8 GeV)" << endl;
    cout << "Higgs mass: " << pydat2.pmas[0][24] << " GeV (default value = 115 GeV)" << endl;

    cout << "lambda QCD: " << pydat1.paru[111] << " GeV (default value = 0.25 GeV)" << endl;

    cout << "alphas behaviour: " << pydat1.mstu[110] << " (default value = 1)" << endl;
    cout << "nr of flavours wrt lambda QCD: " << pydat1.mstu[111] << " (default value = 5)" << endl;
    cout << "min nr of flavours for alphas: " << pydat1.mstu[112] << " (default value = 3)" << endl;
    cout << "max nr of flavours for alphas: " << pydat1.mstu[113] << " (default value = 5)" << endl;

    cout << "maximum angle settings: " << pydat1.mstj[47] << " (default value = 0)" << endl;

    cout << "" << endl;
  }

}  // namespace gen