StFemtoEvent/StFemtoPhysicalHelix.h

/**
 * \class StFemtoPhysicalHelix
 * \brief Helix parametrization for the particle
 *
 * Parametrization of a physical helix that uses ROOT classes
 *
 * \author Grigory Nigmatkulov; e-mail: nigmatkulov@gmail.com
 * \date May 07, 2018
 */

#ifndef StFemtoPhysicalHelix_h
#define StFemtoPhysicalHelix_h

// ROOT headers
#include "TVector3.h"

// FemtoDst headers
#include "StFemtoHelix.h"

//_________________
class StFemtoPhysicalHelix : public StFemtoHelix {

 public:

  /// Empty constructor
  StFemtoPhysicalHelix();
  /// Constructor with momentum, origin, signed Magnetic Field
  /// and Charge of particle (+/- 1)
  StFemtoPhysicalHelix(const TVector3&,
		      const TVector3&,
		      Double_t, Double_t);
  /// Constructor with Curvature, dip angle, phase, origin, h
  StFemtoPhysicalHelix(Double_t, Double_t, Double_t,
		      const TVector3&, Int_t h=-1);
  /// Destructor
  ~StFemtoPhysicalHelix();

  /// Return the momentum at origin
  ///    \param bField magnetic field
  TVector3 momentum(Double_t) const;
  /// Return momemtum at S
  TVector3 momentumAt(Double_t, Double_t) const;
  /// Returns charge of particle
  Int_t charge(Double_t)   const;
  /// 2d DCA to x,y point signed relative to curvature
  Double_t curvatureSignedDistance(Double_t x, Double_t y) ;
  /// 2d DCA to x,y point signed relative to rotation
  Double_t geometricSignedDistance(Double_t x, Double_t y) ;
  /// 3d DCA to 3d point signed relative to curvature
  Double_t curvatureSignedDistance(const TVector3&) ;
  /// 3d DCA to 3d point signed relative to rotation
  Double_t geometricSignedDistance(const TVector3&) ;

  ClassDef(StFemtoPhysicalHelix,1)
};

#endif