RecoPhoton.h

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//****************************************************************************
//*                   This file is part of PandaRoot.                        *
//*                                                                          *
//*            PandaRoot is distributed under the terms of the               *
//*              GNU General Public License (GPL) version 3,                 *
//*                 copied verbatim in the file "LICENSE".                   *
//*                                                                          *
//*  Copyright (C) 2006 - 2024 FAIR GmbH and copyright holders of PandaRoot  *
//*     The copyright holders are listed in the file "COPYRIGHTHOLDERS".     *
//*               The authors are listed in the file "AUTHORS".              *
//****************************************************************************

// ******************************************************
// DecayTreeFitter Package
// We thank the original author Wouter Hulsbergen
// (BaBar, LHCb) for providing the sources.
// http://arxiv.org/abs/physics/0503191v1 (2005)
// Adaptation & Development for PANDA: Ralf Kliemt (2015)
// Adjustment for fully neutral reactions: Jean Noel (2023)
// **********************************************************************************
#ifndef RECOPHOTON_H
#define RECOPHOTON_H 1

#include "RecoParticle.h"
#include "TVector3.h"
#include "Rtypes.h"

namespace DecayTreeFitter {

class RecoPhoton : public RecoParticle {
 public:
  RecoPhoton(RhoCandidate *bc, const ParticleBase *mother);
  virtual ~RecoPhoton();

  virtual int dimM() const { return 3; }
  virtual ErrCode initPar1(FitParams *);
  virtual ErrCode initPar2(FitParams *);

  virtual ErrCode initCov(FitParams *) const;
  virtual int type() const { return kRecoPhoton; }
  virtual ErrCode projectRecoConstraint(const FitParams *, Projection &) const;
  ErrCode updCache();

  virtual void addToConstraintList(constraintlist &alist, int depth) const { alist.push_back(Constraint(this, Constraint::photon, depth, dimM())); }

 private:
  virtual ErrCode initParPhoton(FitParams *, const TVector3 &motherpos) const;
  double m_z;
  TVector3 m_m;
  TMatrixDSym m_V;
  TMatrixDSym m_par_V;
  ClassDef(RecoPhoton, 1)
};

} // namespace DecayTreeFitter
#endif