GFMaterialEffects.h

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/* Copyright 2008-2009, Technische Universitaet Muenchen,
   Authors: Christian Hoeppner & Sebastian Neubert

   This file is part of GENFIT.

   GENFIT is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   GENFIT is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with GENFIT.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef GFMATERIALEFFECTS_H
#define GFMATERIALEFFECTS_H

#include<iostream>
#include"TObject.h"
#include<vector>
#include"TVector3.h"
#include"TMatrixT.h"

class GFMaterialEffects : public TObject{ 
 private:
  GFMaterialEffects();
  virtual ~GFMaterialEffects();

  static GFMaterialEffects* finstance;

 public:
  static GFMaterialEffects* getInstance();
  static void destruct();

  void setEnergyLossBetheBloch(bool opt = true){fEnergyLossBetheBloch=opt;}
  void setNoiseBetheBloch(bool opt = true){fNoiseBetheBloch=opt;}
  void setNoiseCoulomb(bool opt = true){fNoiseCoulomb=opt;}
  void setEnergyLossBrems(bool opt = true){fEnergyLossBrems=opt;}
  void setNoiseBrems(bool opt = true){fNoiseBrems=opt;}


  double effects(const std::vector<TVector3>& points, 
                 const std::vector<double>& pointPaths, 
                 const double& mom,
                 const int& pdg,
                 const bool& doNoise = false,
                       TMatrixT<double>* noise = NULL,
                 const TMatrixT<double>* jacobian = NULL,
                 const TVector3* directionBefore = NULL, 
                 const TVector3* directionAfter = NULL);


  double stepper(const double& maxDist,
                 const double& posx,
                 const double& posy,
                 const double& posz,
                 const double& dirx,
                 const double& diry,
                 const double& dirz,
                 const double& mom,
                 const int& pdg);

  double stepper(const double& maxDist,
                 const TVector3& pos, 
                 const TVector3& dir,
                 const double& mom,
                 const int& pdg){
    return stepper(maxDist, pos.X(),pos.Y(),pos.Z(),dir.X(),dir.Y(),dir.Z(),mom,pdg);
  }

 private:
  void getParameters();

  void calcBeta(double mom);


  double energyLossBetheBloch(const double& mom);


  void noiseBetheBloch(const double& mom,
                             TMatrixT<double>* noise) const;


  void noiseCoulomb(const double& mom,
                          TMatrixT<double>* noise,
                    const TMatrixT<double>* jacobian,
                    const TVector3* directionBefore,
                    const TVector3* directionAfter) const;


  double energyLossBrems(const double& mom) const;


  void noiseBrems(const double& mom,
                        TMatrixT<double>* noise) const;

  bool fEnergyLossBetheBloch;
  bool fNoiseBetheBloch;
  bool fNoiseCoulomb;
  bool fEnergyLossBrems;
  bool fNoiseBrems;

  const double me; // electron mass (GeV)

  double fstep; // stepsize

  // cached values for energy loss and noise calculations
  double fbeta;
  double fdedx;
  double fgamma;
  double fgammaSquare;

  double fmatDensity;
  double fmatZ;
  double fmatA;
  double fradiationLength;
  double fmEE; // mean excitation energy

  int fpdg;
  double fcharge;
  double fmass;

 public:
  ClassDef(GFMaterialEffects,1)

};

#endif