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BeamSpot.h

Go to the documentation of this file.

#ifndef BeamSpot_BeamSpot_h
#define BeamSpot_BeamSpot_h

#include <Rtypes.h>
#include "DataFormats/Math/interface/Error.h"
#include "DataFormats/Math/interface/Point3D.h"
#include <string>
#include <sstream>


namespace reco {

  class BeamSpot {
  public:
    typedef math::XYZPoint Point;
    enum { dimension = 7 };
    typedef math::Error<dimension>::type CovarianceMatrix;
    enum { dim3 = 3 };
    typedef math::Error<dim3>::type Covariance3DMatrix;
    enum { resdim = 2 };
    typedef math::Error<resdim>::type ResCovMatrix;
        
    BeamSpot();

    BeamSpot( const Point &point,
              double sigmaZ,
              double dxdz,
              double dydz,
              double BeamWidth,
              const CovarianceMatrix &error) { 
      position_ = point;
      sigmaZ_ = sigmaZ;
      dxdz_ = dxdz;
      dydz_ = dydz;
      BeamWidth_ = BeamWidth;
      error_ = error;
    };
    
    void dummy();
    const Point & position() const { return position_; }
    double x0() const { return position_.X(); }
    double y0() const { return position_.Y(); }
    double z0() const { return position_.Z(); }
    double sigmaZ() const { return sigmaZ_; }
    double dxdz() const { return dxdz_; }
    double dydz() const { return dydz_; }
    double BeamWidth() const { return BeamWidth_; }
    double x0Error() const { return sqrt( error_(0,0) ); }
    double y0Error() const { return sqrt( error_(1,1) ); }
    double z0Error() const { return sqrt( error_(2,2) ); }
    double sigmaZ0Error() const { return sqrt ( error_(3,3) ); }
    double dxdzError() const { return sqrt ( error_(4,4) ); }
    double dydzError() const { return sqrt ( error_(5,5) ); }

    double BeamWidthError() const { return sqrt ( error_(6,6) );}
    double covariance( int i, int j) const {
      return error_(i,j);
    }
    CovarianceMatrix covariance() const { return error_; }
    Covariance3DMatrix covariance3D() const {

      Covariance3DMatrix matrix;
      for (int j=0; j<3; j++) {
        for (int k=j; k<3; k++) {
          matrix(j,k) = error_(j,k);
        }
      }
      return matrix;
    };

    Covariance3DMatrix rotatedCovariance3D() const;

    void print( std::stringstream& ss ) const;

  private:
        Point position_;
        CovarianceMatrix error_;

        Double32_t sigmaZ_;
        Double32_t BeamWidth_;
        Double32_t dxdz_;
        Double32_t dydz_;
        
        
  };
  std::ostream& operator<< ( std::ostream&, BeamSpot beam );

}

#endif

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