Constrained_Z.h

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//
//
// File: Constrained_Z.h
// Purpose: Do kinematic fitting for a (Z->ll)+jets event.
// Created: Apr, 2004, sss
//
// CMSSW File      : interface/Constrained_Z.h
// Original Author : Scott Stuart Snyder <snyder@bnl.gov> for D0
// Imported to CMSSW by Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch>

#ifndef HITFIT_CONSTRAINED_Z_H
#define HITFIT_CONSTRAINED_Z_H

#include "TopQuarkAnalysis/TopHitFit/interface/Fourvec_Constrainer.h"
#include "TopQuarkAnalysis/TopHitFit/interface/matutil.h"
#include <iosfwd>

namespace hitfit {

  class Defaults;
  class Lepjets_Event;

  class Constrained_Z_Args
  //
  // Purpose: Hold on to parameters for the Constrained_Z class.
  //
  // Parameters controlling the operation of the fitter:
  //   float zmass        - The mass to which the Z should be fixed.
  //
  {
  public:
    // Constructor.  Initialize from a Defaults object.
    Constrained_Z_Args(const Defaults& defs);

    // Retrieve parameter values.
    double zmass() const;

    // Arguments for subobjects.
    const Fourvec_Constrainer_Args& fourvec_constrainer_args() const;

  private:
    // Hold on to parameter values.
    double _zmass;

    Fourvec_Constrainer_Args _fourvec_constrainer_args;
  };

  //*************************************************************************

  class Constrained_Z
  //
  // Purpose: Do kinematic fitting for a (Z->ll)+jets event.
  //
  {
  public:
    // Constructor.
    Constrained_Z(const Constrained_Z_Args& args);

    // Do a constrained fit.
    double constrain(Lepjets_Event& ev, Column_Vector& pull);

    // Dump out our state.
    friend std::ostream& operator<<(std::ostream& s, const Constrained_Z& cz);

  private:
    // Parameter settings.
    const Constrained_Z_Args& _args;

    // The guy that actually does the work.
    Fourvec_Constrainer _constrainer;
  };

}  // namespace hitfit

#endif  // not HITFIT_CONSTRAINED_Z_H