InstallArea/include/TrkReco/TrkReco/RkFitMaterial.h

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//-----------------------------------------------------------------------
//------------------------------------------------------------------------
#ifndef _DEFINE_MATERIAL_H_
#define _DEFINE_MATERIAL_H_
 
class RkFitMaterial {
  double rza_;  // density * (atomic number) / weight
  double isq_;  // mean excitation potential ** 2
  double x0_;   // radiation length
  double z_;   
 
public:
  /// Constructor
  RkFitMaterial() {}
  RkFitMaterial(double z, double a, double i,
        double rho, double x0);
  RkFitMaterial( const RkFitMaterial& mat); 
  /// Calculate energy loss 
  double dE(double mass, double path, double p) const;
 
  /// Calculate Multiple Scattering angle
  double mcs_angle(double mass, double path, double p) const;
 
  /// Calculate the straggling of energy loss
  double del_E(double mass, double path, double p) const;
 
  /// Extractor
  double X0(void) const { return x0_; }
 
};
 
#endif