The goal of this study is to understand the discrepancy in fit results from analyses w/ and w/o electron cut.  Here I will mostly focus on the first kT bin (0.15-0.25 GeV/c) since  the larger discrepancy is for this bin.

• the most central AuAu@19.6 GeV collisions (bin1)
• first kT bin (kT : [0.15,0.25] GeV/c)
• the same fitting conditions e.g.
  
  • fit range Qx : [0.00,0.16] GeV/c
  • Coulomb radius - 4 fm
  • initial fit parameters  etc.

ANALYSES
With  e-cut		Without e-cut
Fit results
Norm       = 0.02965 +/- 0.00005 Lambda  = 0.43 +/- 0.07 Rout          = 4.74 +/- 0.43 Rside        = 4.95 +/- 0.42 Rlong        = 5.86 +/- 0.49		Norm       = 0.02959 +/- 0.00002  Lambda  = 0.33 +/- 0.05  Rout          = 5.33 +/- 0.34  Rside         = 4.61 +/- 0.41  Rlong         = 5.39 +/- 0.28
Cartesian projections
SH Moments
Number of pairs in numerators
6.87553600000000000e+06		1.28142460000000000e+07
<kT> in kT: [0.15,0.25] GeV/c
0.2011 GeV/c		0.1992 GeV/c
Fit contours green - 3-sigma contour red - 1-sigma contour
kT dependence of HBT radii obtained from both analyses presented above

Related analyses:

• AuAu@19.6GeV:Dependence of fitted HBT radii on fit range
• AuAu@19.6GeV:Dependence of fitted HBT radii on Coulomb radius
• AuAu@19.6GeV: SH moments - why some bins are not shown on plots?
• AuAu@19.6GeV: Data selection