fitWZ Namespace Reference

Functions
def	MyChi2

Variables
tuple	arglist = array('d', 10*[0.])
float	corrZEff = -0.236
tuple	errpar0 = Double(0.0)
float	ewxsection = 0.090
float	ezxsection = 0.031
float	finalChi2 = 0.0
tuple	gMinuit = TMinuit()
tuple	ier = Long(0)
tuple	par0 = Double(0.0)
float	sysEff = 0.013
float	wxsection = 9.922
float	zxsection = 0.924

Function Documentation

def fitWZ.MyChi2	(		npar,
			g,
			chi2,
			x,
			iflag
	)

Definition at line 19 of file fitWZ.py.

def MyChi2 (npar, g, chi2, x, iflag):
      # Inverse of (Zyield,sysEff) covariance matrix
      s11 = 1./ezxsection**2/(1.-corrZEff**2)
      s22 = 1./sysEff**2/(1.-corrZEff**2)
      s12 = -corrZEff/(1.-corrZEff**2)/ezxsection/sysEff

      # Build chi2
      wxsFit = x[0]*x[1]
      zxsFit = x[1]
      effFit = x[2]
      chi2[0] = (wxsFit*(1.+effFit)-wxsection)*(wxsFit*(1.+effFit)-wxsection)/ewxsection/ewxsection
      chi2[0] += (zxsFit-zxsection)*(zxsFit-zxsection) *s11
      chi2[0] += effFit*effFit * s22
      chi2[0] += 2*(zxsFit-zxsection)*effFit * s12