MuonPTResolution.h

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
// Package : MuonRecValidatorAOD
// Author:   T.A.Mueller (LMU) thomas(at)cern.ch
// Feb. 2007
//
// DESCRIPTION:
// Subject: These functions allow a common agreed way to define the muon pT-Resolution
 
 
#include <string>
class TH1F;
 
double  getContentInRange(TH1F *hist, double centralX, double halfWidth);
 
// Uses n_max_runs = 3 and does not give the alternative HalfWidth for non-gaussian
//distributions
void    getMuonPTResolution(    TH1F *hist,
                double &PTResMean,
                double &ErrMean,
                double &PTSigma,
                double &ErrSigma,
                double &TailFraction);
 
// Gives Number of Entries in Range centralX +/- halfWidth
// Fits a gaussian to the given histogramm, then discards all entries more than 2 sigmas
// away from PTResMean. Iterates n_max_runs times. Sigma of the last fitted gaussian is
// returned as &PTSigma. Also goes from PTResMean and increases HalfWidth until
// PerCentageOfEntries % are within the range PTResMean +/- Halfwidth. This can be used as
// an alternative method to calculate the width of a non-gaussian pt-distribution
void    getMuonPTResolution(    TH1F *hist,
                int n_max_runs,
                double &PTResMean,
                double &ErrMean,
                double &PTSigma,
                double &ErrSigma,
                double &TailFraction,
                double PercentageOfEntriesInWidth,
                double &HalfWidth);