EvtBCL.cc

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
 
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtSemiLeptonicVectorAmp.hh"
#include "EvtGenBase/EvtSemiLeptonicScalarAmp.hh"
#include <string>
 
#include "generators/evtgen/EvtGenModelRegister.h"
#include "generators/evtgen/models/EvtBCL.h"
#include "generators/evtgen/models/EvtBCLFF.h"
 
 
namespace Belle2 {
  B2_EVTGEN_REGISTER_MODEL(EvtBCL);
 
  EvtBCL::EvtBCL() : bclmodel(nullptr), calcamp(nullptr) {}
 
  EvtBCL::~EvtBCL()
  {
    delete bclmodel;
    bclmodel = nullptr;
    delete calcamp;
    calcamp = nullptr;
  }
 
  std::string EvtBCL::getName()
  {
    return "BCL";
  }
 
  EvtDecayBase* EvtBCL::clone()
  {
    return new EvtBCL;
  }
 
  void EvtBCL::decay(EvtParticle* p)
  {
    p->initializePhaseSpace(getNDaug(), getDaugs());
    calcamp->CalcAmp(p, _amp2, bclmodel);
  }
 
 
  void EvtBCL::initProbMax()
  {
 
    EvtId parnum, mesnum, lnum, nunum;
 
    parnum = getParentId();
    mesnum = getDaug(0);
    lnum = getDaug(1);
    nunum = getDaug(2);
 
    double mymaxprob = calcamp->CalcMaxProb(parnum, mesnum, lnum, nunum, bclmodel);
 
    setProbMax(mymaxprob);
  }
 
 
  void EvtBCL::init()
  {
 
    checkNDaug(3);
 
    //We expect the parent to be a scalar
    //and the daughters to be X lepton neutrino
 
    checkSpinParent(EvtSpinType::SCALAR);
    checkSpinDaughter(1, EvtSpinType::DIRAC);
    checkSpinDaughter(2, EvtSpinType::NEUTRINO);
 
    EvtSpinType::spintype mesontype = EvtPDL::getSpinType(getDaug(0));
 
    bclmodel = new EvtBCLFF(getNArg(), getArgs());
 
    if (mesontype == EvtSpinType::SCALAR) {
      calcamp = new EvtSemiLeptonicScalarAmp;
    }
    if (mesontype == EvtSpinType::VECTOR) {
      calcamp = new EvtSemiLeptonicVectorAmp;
    }
    // Tensor Meson implementation is possible here.
 
  }
 
}