EnergyLossEstimator.h

/**************************************************************************
 * BASF2 (Belle Analysis Framework 2)                                     *
 * Copyright(C) 2017 - Belle II Collaboration                             *
 *                                                                        *
 * Author: The Belle II Collaboration                                     *
 * Contributors: Oliver Frost                                             *
 *                                                                        *
 * This software is provided "as is" without any warranty.                *
 **************************************************************************/
#pragma once
 
#include <cmath>
 
namespace Belle2 {
  namespace TrackFindingCDC {
 
    class EnergyLossEstimator {
 
    public:
      static EnergyLossEstimator forCDC();
 
      static double getMass(int pdgCode);
 
      static int getCharge(int pdgCode);
 
      EnergyLossEstimator(double eDensity, double I, double bZ = NAN);
 
      double getBetheStoppingPower(double p, int pdgCode) const;
 
      double getEnergyLoss(double p, int pdgCode, double arcLength) const;
 
      double getMomentumLossFactor(double p, int pdgCode, double arcLength) const;
 
      double getLossDist2D(double pt, int pdgCode, double arcLength2D) const;
 
    private:
      double m_eDensity;
 
      double m_I;
 
      double m_bZ;
    };
  }
}