Introduction

I'm building off the work done by Will that is documented here.  My mission is to get etas in neighboring sectors. 

For plots shown here I require the photon candidates to be in neighboring sectors and place a cut on the angle between the momentum vectors of the photons. 

Update Tuesday Afternoon

I tried doing an energy-dependent opening angle cut, with different cuts for eta energies <10, <15 and <20.  I set the limits based on the opening angle I would expect for Zgg=0 and Zgg=0.7, lower or raised by 25%.  I'm worried I have just sculpted this "peak."  Note that the plots say pi0, but it's really my eta candidates (forgot to change the labels).

Some Plots

These are all from 2-D projections, I show all masses and then the plot the variable for just the eta window between 0.45 and 0.65 GeV (so ignore the "versus mass" in the title).  This data is something like a quarter (maybe less) of all the 2006 data available.  I'm going to need some disk space.