BeamSpotCollectorModule.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 <tracking/modules/BeamSpotCollector/BeamSpotCollectorModule.h>
 
#include <analysis/dataobjects/ParticleList.h>
#include <analysis/utility/ReferenceFrame.h>
#include <mdst/dataobjects/TrackFitResult.h>
 
using namespace Belle2;
 
#include <iostream>
 
//-----------------------------------------------------------------
//                 Register the Module
//-----------------------------------------------------------------
REG_MODULE(BeamSpotCollector);
 
//-----------------------------------------------------------------
//                 Implementation
//-----------------------------------------------------------------
 
BeamSpotCollectorModule::BeamSpotCollectorModule() : CalibrationCollectorModule(),
  m_evt(-99), m_exp(-99), m_run(-99),
  m_time(-99),
  m_mu0_d0(-99), m_mu0_z0(-99), m_mu0_phi0(-99), m_mu0_tanlambda(-99), m_mu0_omega(-99),
  m_mu1_d0(-99), m_mu1_z0(-99), m_mu1_phi0(-99), m_mu1_tanlambda(-99), m_mu1_omega(-99)
{
  //Set module properties
 
  setDescription("Collect data for BeamSpot calibration algorithm using the position of mu+mu- events");
  setPropertyFlags(c_ParallelProcessingCertified);
 
  addParam("Y4SPListName", m_Y4SPListName, "Name of the Y4S particle list", std::string("Upsilon(4S):IPDQM"));
}
 
void BeamSpotCollectorModule::prepare()
{
  B2INFO("Init of the trees");
  std::string objectName = "events";
  //Data object creation --------------------------------------------------
  TTree* tree = new TTree(objectName.c_str(), "");
 
  tree->Branch<int>("event", &m_evt);
  tree->Branch<int>("exp", &m_exp);
  tree->Branch<int>("run", &m_run);
  tree->Branch<double>("time", &m_time);
 
  tree->Branch<double>("mu0_d0", &m_mu0_d0);
  tree->Branch<double>("mu0_z0", &m_mu0_z0);
  tree->Branch<double>("mu0_phi0", &m_mu0_phi0);
  tree->Branch<double>("mu0_tanlambda", &m_mu0_tanlambda);
 
  tree->Branch<double>("mu1_d0", &m_mu1_d0);
  tree->Branch<double>("mu1_z0", &m_mu1_z0);
  tree->Branch<double>("mu1_phi0", &m_mu1_phi0);
  tree->Branch<double>("mu1_tanlambda", &m_mu1_tanlambda);
 
 
  // We register the objects so that our framework knows about them.
  // Don't try and hold onto the pointers or fill these objects directly
  // Use the getObjectPtr functions to access collector objects
  registerObject<TTree>(objectName, tree);
}
 
 
void BeamSpotCollectorModule::collect()
{
  m_evt  = m_emd->getEvent();
  m_run  = m_emd->getRun();
  m_exp  = m_emd->getExperiment();
  m_time = m_emd->getTime() / 1e9 / 3600.; //from ns to hours
 
 
  StoreObjPtr<ParticleList> Y4SParticles(m_Y4SPListName);
 
 
  if (!Y4SParticles.isValid() || abs(Y4SParticles->getPDGCode()) != 300553)
    return;
 
  if (Y4SParticles->getListSize() !=  1)
    return;
 
  if (Y4SParticles->getParticle(0)->getDaughterIndices().size() != 2)
    return;
 
  const Particle* part0 = Y4SParticles->getParticle(0)->getDaughter(0);
  const Particle* part1 = Y4SParticles->getParticle(0)->getDaughter(1);
  const TrackFitResult* tr0 = part0->getTrackFitResult();
  const TrackFitResult* tr1 = part1->getTrackFitResult();
 
  m_mu0_d0        = tr0->getD0();
  m_mu0_z0        = tr0->getZ0();
  m_mu0_phi0      = tr0->getPhi0();
  m_mu0_tanlambda = tr0->getTanLambda();
  m_mu0_omega     = tr0->getOmega();
 
 
  m_mu1_d0        = tr1->getD0();
  m_mu1_z0        = tr1->getZ0();
  m_mu1_phi0      = tr1->getPhi0();
  m_mu1_tanlambda = tr1->getTanLambda();
  m_mu1_omega     = tr1->getOmega();
 
 
  getObjectPtr<TTree>("events")->Fill();
 
}