Chi2FacetRelationFilter.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
#pragma once
 
#include <tracking/trackFindingCDC/filters/facetRelation/BaseFacetRelationFilter.h>
 
#include <cdc/topology/ISuperLayer.h>
 
#include <array>
#include <vector>
#include <string>
 
namespace Belle2 {
  namespace TrackingUtilities {
    class CDCFacet;
  }
  namespace TrackFindingCDC {

    class Chi2FacetRelationFilter : public BaseFacetRelationFilter {
 
    private:
      using Super = BaseFacetRelationFilter;
 
    public:
      Chi2FacetRelationFilter();

      Chi2FacetRelationFilter(double chi2Cut, double penaltyWidth);
 
    public:
      void exposeParameters(ModuleParamList* moduleParamList, const std::string& prefix) override;

      void initialize() final;
 
    public:
      TrackingUtilities::Weight operator()(const TrackingUtilities::CDCFacet& fromFacet,
                                           const TrackingUtilities::CDCFacet& toFacet) final;
 
    private: // Parameters
      std::vector<double> m_param_chi2CutByISuperLayer{130.0};  // first guess was 350;

      double m_param_penaltyFactor = 200.0 / 130.0; // first guess was 800 / 350;
 
    private: // Cached values
      std::array<double, CDC::ISuperLayerUtil::c_N> m_chi2CutByISuperLayer{};

      std::array<double, CDC::ISuperLayerUtil::c_N> m_penaltyWidthByISuperLayer{};
    };
  }
}