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ITrackTrajectory.h

Go to the documentation of this file.

// Class to standardise access to trajectory parameters of any object 
// which is treatable as a track with a trajectory

#ifndef ATLFAST_ITRACKTRAJECTORY_H
#define ATLFAST_ITRACKTRAJECTORY_H


#include "CLHEP/Vector/ThreeVector.h"
#include "CLHEP/Geometry/Point3D.h"

namespace Atlfast {
class ITrackTrajectory  {

  public:   
   
   // Parameters of position of closest approach to origin
   virtual double impactParameter() const =0 ;
   virtual double zPerigee()        const =0 ;
   virtual HepPoint3D startPoint()  const =0 ;
   virtual double radius()          const =0 ;

   // Directions at position of closest approach 
   virtual double phi()             const =0 ;
   virtual double eta()             const =0 ;
   virtual double cotTheta()        const =0 ;

   // Momentum at position of closest approach
   virtual double pT()                    const =0 ;
   virtual Hep3Vector threeMomentum()     const =0 ;
   virtual operator Hep3Vector()          const =0 ;

   // Curvature related information
   virtual double invPtCharge()     const =0 ;
   virtual double curvature()       const =0 ;
   // Sign of curvature (-1 or +1)
   virtual int    signOfCharge()    const =0 ;

};

} // End namespace 

#endif

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