Abstract:  We compare yields extracted using the EEmc Gammas via conversion method, systematics II with estimates based on a chi^2/ndf analysis of the SMD response. 

Use the Gamma tree production in the silver run list.

 

Cuts:

1) gamma candidate pT > 8 GeV in the EEmc

2) gamma is 90% isolated (90% of ET summed w/in R<0.3 is in the gamma candidate).

3)  charged particle veto (Epre1 shows no energy summed over R<0.3).

 

Figure 1 -- Yields extracted using the conversion method, plotted vs D.  Blue data points indicate extracted gamma yield.  Dashed blue line represents EM background.  Red line hadronic background.

 

 

Pibero worked up a shower shape for events w/ pT > 8.0 GeV... but this produced chi2 values which were far too large.  So I'm falling back to an older shower shape,

which was EEmc Gammas via conversion method, chi2 comparison.

 

Figure 2 -- chi2/ndf distribution for the above events.  The chi2 is calculated by taking a shower shape, derived by summing single gammas identified as part of an eta --> 2 gamma decay.  At left are "Will's" photons, at right are "Pibero's".  Summing the events below the blue line yields 501 events for Will's shape, 436 for Pibero's.