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#ifndef GsfTrackReco_GsfTangent_h
#define GsfTrackReco_GsfTangent_h
/** Class holding information on the tangent to the electron track
* on one surface
*/
#include "DataFormats/Math/interface/Vector3D.h"
#include "DataFormats/Math/interface/Point3D.h"
#include "DataFormats/Math/interface/Vector.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/Measurement1D.h"
namespace reco {
class GsfTangent {
public:
/// default constructor
GsfTangent() : position_(0., 0., 0.), momentum_(0., 0., 0.), deltaP_(0.), sigDeltaP_(0.) {}
/// constructor from position, momentum and estimated deltaP
GsfTangent(const math::XYZPoint& position, const math::XYZVector& momentum, const Measurement1D& deltaP)
: position_(position), momentum_(momentum) {
deltaP_ = deltaP.value();
sigDeltaP_ = deltaP.error();
}
const math::XYZPoint& position() const { return position_; }
const math::XYZVector& momentum() const { return momentum_; }
/// estimated deltaP (p_out-p_in)
Measurement1D deltaP() const { return Measurement1D(deltaP_, sigDeltaP_); }
private:
math::XYZPoint position_;
math::XYZVector momentum_;
double deltaP_;
double sigDeltaP_;
};
} // namespace reco
#endif
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