PerigeeParameters.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/geometry/UncertainParameters.h>
 
namespace Belle2 {
 
  namespace TrackFindingCDC {

    namespace NPerigeeParameterIndices {

      enum EPerigeeParameter {
        c_Curv = 0,

        c_Phi0 = 1,

        c_I = 2,

        c_N = 3,
      };
    }

    using EPerigeeParameter = NPerigeeParameterIndices::EPerigeeParameter;
 
    // Guard to prevent repeated template symbol emission
    struct PerigeeUtil;
    extern template struct UncertainParametersUtil<PerigeeUtil, EPerigeeParameter>;

    struct PerigeeUtil : UncertainParametersUtil<PerigeeUtil, EPerigeeParameter> {

      static ParameterVector reversalSigns()
      {
        return ParameterVector({ -1.0, 1.0, -1.0});
      }

      static double average(const PerigeeUtil::ParameterVector& fromPar,
                            const PerigeeUtil::CovarianceMatrix& fromCov,
                            const PerigeeUtil::ParameterVector& toPar,
                            const PerigeeUtil::CovarianceMatrix& toCov,
                            PerigeeUtil::ParameterVector& avgPar,
                            PerigeeUtil::CovarianceMatrix& avgCov);
    };

    using PerigeeParameters = PerigeeUtil::ParameterVector;

    using PerigeeCovariance = PerigeeUtil::CovarianceMatrix;

    using PerigeePrecision = PerigeeUtil::PrecisionMatrix;

    using PerigeeJacobian = PerigeeUtil::JacobianMatrix;
 
  }

}