Do a constrained kinematic fitting for a $Z\to\ell^{+}\ell^{-} + \rm{jets}$ event. More...

#include <Constrained_Z.h>

Public Member Functions
double	constrain (Lepjets_Event &ev, Column_Vector &pull)
	Do a constrained fit of $Z\to\ell^{+}\ell^{-} + \rm{jets}$ event. Returns the pull quantities in pull. Returns the $\chi^{2}$ , this will be negative if the fit failed to converge.
	Constrained_Z (const Constrained_Z_Args &args)
	Constructor, create an instance of the Constrained_Z object from the argument object.
Private Attributes
const Constrained_Z_Args &	_args
Fourvec_Constrainer	_constrainer
Friends
std::ostream &	operator<< (std::ostream &s, const Constrained_Z &cz)
	Output stream operator, print the content of this Constrained_Z to an output stream.

Detailed Description

Do a constrained kinematic fitting for a $Z\to\ell^{+}\ell^{-} + \rm{jets}$ event.

Definition at line 111 of file Constrained_Z.h.

Constructor & Destructor Documentation

hitfit::Constrained_Z::Constrained_Z ( const Constrained_Z_Args & args )

Constructor, create an instance of the Constrained_Z object from the argument object.

Parameters:

args	Argument for this instance of Constrained_Z object.

Definition at line 91 of file Constrained_Z.cc.

References _args, _constrainer, hitfit::Fourvec_Constrainer::add_constraint(), hitfit::lepton_label, and hitfit::Constrained_Z_Args::zmass().

  : _args (args),
    _constrainer (args.fourvec_constrainer_args())
{
  char buf[256];
  sprintf (buf, "(%d) = %f", lepton_label, _args.zmass());
  _constrainer.add_constraint (buf);
}

Member Function Documentation

double hitfit::Constrained_Z::constrain	(	Lepjets_Event &	ev,
		Column_Vector &	pull
	)

Do a constrained fit of $Z\to\ell^{+}\ell^{-} + \rm{jets}$ event. Returns the pull quantities in pull. Returns the $\chi^{2}$ , this will be negative if the fit failed to converge.

Parameters:

ev	The event to be fitted (input), and the event after fitting (output).
pull	Pull quantities for the well-measured variables.

Input:

Lepjets_Event ev.

Output:

Lepjets_Event ev.
Column_Vector pull.

Return:: The $\chi^{2}$ of the fit. Return a negative value if the fit didn't converge.

Definition at line 226 of file Constrained_Z.cc.

References _constrainer, hitfit::Fourvec_Constrainer::constrain(), and m.

{
  Fourvec_Event fe;
  do_import (ev, fe);
  Column_Vector pully;
  double m, sigm;
  double chisq = _constrainer.constrain (fe, m, sigm, pull, pully);
  do_export (fe, ev);

  return chisq;
}