CosDirectionXY.h

/**************************************************************************
* BASF2 (Belle Analysis Framework 2)                                     *
* Copyright(C) 2014 - Belle II Collaboration                             *
*                                                                        *
* Author: The Belle II Collaboration                                     *
* Contributors: Jakob Lettenbichler (jakob.lettenbichler@oeaw.ac.at)     *
*                                                                        *
* This software is provided "as is" without any warranty.                *
**************************************************************************/
 
#pragma once
 
#include <tracking/trackFindingVXD/filterMap/filterFramework/SelectionVariable.h>
#include <cmath>
 
#define COSDIRECTIONXY_NAME CosDirectionXY
 
namespace Belle2 {
  template <typename PointType >
  class COSDIRECTIONXY_NAME : public SelectionVariable< PointType , 2, double > {
  public:
    PUT_NAME_FUNCTION(COSDIRECTIONXY_NAME);
 
    static double value(const PointType& outerHit, const PointType& innerHit)
    {
      double result = (outerHit.X() * innerHit.X() + outerHit.Y() * innerHit.Y());
      result /= sqrt(outerHit.X() * outerHit.X() + outerHit.Y() * outerHit.Y());
      result /= sqrt(innerHit.X() * innerHit.X() + innerHit.Y() * innerHit.Y());
      return result;
    }
  };
 
}