MuonBetaCalculationUtils.h

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/*
  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef MUON_MUONBETACALCULATIONUTILS_H
#define MUON_MUONBETACALCULATIONUTILS_H
 
#include "GaudiKernel/PhysicalConstants.h"
 
namespace Muon {
 
  class MuonBetaCalculationUtils {
  public:
    
    MuonBetaCalculationUtils(float mass=0.) : m_mass2(mass*mass) {}
 
    float calculateBetaTrack( float p ) {
      return fabs(p)/sqrt(p*p+m_mass2);
    }
 
    float calculateBeta( float time, float dist ) {
      return dist*m_inverseSpeedOfLight/time;
    }
 
    float calculateBetaError( float time, float error, float dist ) {
      return dist*m_inverseSpeedOfLight/(time*time)*error;
    }
 
    float calculateInverseBeta( float time, float dist ) {
      return time/(dist*m_inverseSpeedOfLight);
    }
 
    float calculateInverseBetaError( float error, float dist ) {
      return error/(dist*m_inverseSpeedOfLight);
    }
 
    float calculateTof( float beta, float dist ){
      return dist*m_inverseSpeedOfLight/beta;
    }
 
  private:
    const double m_inverseSpeedOfLight = 1 / Gaudi::Units::c_light; // need 1/299.792458 inside calculateTof()/calculateBeta()
    float m_mass2;
  };
 
}
 
 
#endif