SelectDaughtersModule.cc

/**************************************************************************
 * BASF2 (Belle Analysis Framework 2)                                     *
 * Copyright(C) 2017 - Belle II Collaboration                             *
 *                                                                        *
 * Author: The Belle II Collaboration                                     *
 * Contributors: Luigi Li Gioi                                            *
 *                                                                        *
 * This software is provided "as is" without any warranty.                *
 **************************************************************************/
 
#include <analysis/modules/SelectDaughters/SelectDaughtersModule.h>
 
// dataobjects
#include <analysis/dataobjects/Particle.h>
#include <analysis/dataobjects/ParticleList.h>
 
// Magnetic field
#include <framework/geometry/BFieldManager.h>
 
using namespace std;
 
using namespace Belle2;
 
//-----------------------------------------------------------------
//                 Register the Module
//-----------------------------------------------------------------
REG_MODULE(SelectDaughters)
 
//-----------------------------------------------------------------
//                 Implementation
//-----------------------------------------------------------------
 
SelectDaughtersModule::SelectDaughtersModule() : Module()
{
  // Set module properties
  setDescription("SelectDaughters");
 
  //Parameter definitions
  addParam("listName", m_listName, "name of particle list", string(""));
  addParam("decayString", m_decayString, "specifies which daughter particles will remain", string(""));
 
}
 
void SelectDaughtersModule::initialize()
{
  if (m_decayString != "") {
    m_decaydescriptor.init(m_decayString);
  }
}
 
void SelectDaughtersModule::event()
{
 
  StoreObjPtr<ParticleList> plist(m_listName);
  if (!plist) {
    B2ERROR("ParticleList " << m_listName << " not found");
    return;
  }
  if (m_decayString == "") {
    B2ERROR("decay descriptor cannot be empty");
    return;
  }
 
  unsigned int n = plist->getListSize();
  for (unsigned i = 0; i < n; i++) {
    Particle* particle = plist->getParticle(i);
 
    std::vector<Particle*> daughters = particle->getDaughters();
    std::vector<const Particle*> selParticles = m_decaydescriptor.getSelectionParticles(particle);
 
    for (auto& daughter : daughters) {
      bool isSel = false;
      for (auto& selParticle : selParticles) {
        if (daughter == selParticle) isSel = true;
      }
      if (!isSel) particle->removeDaughter(daughter);
    }
  }
}