SeedChargeCDCPathFilter.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/ckf/cdc/filters/paths/BaseCDCPathFilter.h>
 
#include <tracking/trackFindingCDC/numerics/Weight.h>
 
namespace Belle2 {
  class SeedChargeCDCPathFilter : public BaseCDCPathFilter {
  public:
    TrackFindingCDC::Weight operator()(const BaseCDCPathFilter::Object& path) final
    {
      // Not able to find any hits
      if (path.size() == 1) {
        return NAN;
      }
 
      // Filter does not make sense if seeds initialited with 0 charge
      if (path.front().getSeed()->getChargeSeed() == 0) {
        return 0.;
      }
 
      // We don't want tracks that flipped charge
      if (path.front().getSeed()->getChargeSeed() != path.back().getTrackState().getCharge()) {
        B2DEBUG(29, "Flipped charge: " << path.front().getSeed()->getChargeSeed() << "->" << path.back().getTrackState().getCharge());
        return NAN;
      }
 
      return path.front().getSeed()->getChargeSeed();
    }
  };
}