GsfMaterial.h

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/*
   Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 */

#ifndef GSFMATERIAL_H
#define GSFMATERIAL_H
 
#include "TrkGaussianSumFilterUtils/GsfConstants.h"
//
#include "EventPrimitives/EventPrimitives.h"
//
#include <array>
 
namespace GsfMaterial {

struct EnergyLoss
{
  struct element
  {
    double weight = 0;
    double deltaP = 0;
    double deltaQOvePCov = 0;
  };
  std::array<element, GSFConstants::maxNumberofMatComponents> elements = {};
  //We need to keep track of the actual elements in use
  int numElements = 0;
};

struct Scattering
{
  double deltaThetaCov = 0;
  double deltaPhiCov = 0;
  void reset()
  {
    deltaThetaCov = 0;
    deltaPhiCov = 0;
  }
};

struct Combined
{
  //weights
  std::array<double, GSFConstants::maxNumberofMatComponents> weights = {};
  //difference in momentum due to material effects
  std::array<double, GSFConstants::maxNumberofMatComponents> deltaPs = {};
  //parameters after material update
  alignas(GSFConstants::alignment) std::array< AmgVector(5),
    GSFConstants::maxNumberofMatComponents> parameters = {};
  //Covariance after material effects
  //(we hold initially the delta and then sum it with the covariance)
  alignas(GSFConstants::alignment) std::array<AmgSymMatrix(5),
    GSFConstants::maxNumberofMatComponents> covariances = {};
  //We need to keep track of the actual elements in use
  size_t numEntries = 0;
 
};
 
} // end namespace GSFMaterial
 
#endif