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Hi all,<br>
<br>
Attached is an updated version of the slides<br>
from today's meeting. I'm increasingly convinced<br>
that the peak I showed is indeed pie and not turkey.<br>
I might have two flavors of pie also: one with a little<br>
bit of strangeness stirred in.<br>
<br>
The definitive proof will be in a plot of E_cluster / p_track.<br>
There are some scale factors that have to be adjusted <br>
depending on where in the analysis chain one gets the <br>
E_cluster value. (I guess it is a semi-blind test for the <br>
person who is producing the plot.)<br>
<br>
I also expect E/p for electrons to have some mild momentum <br>
dependence. As p increases the ratio should also <br>
increase because of the fact that the DAQ sparsification <br>
thresholds are fractionally less significant for larger <br>
energies. (I think I see this same effect as a slight <br>
dependence of the pi0 mass on the photon energy cut.) <br>
The effect should be reduced with increased PMT HV <br>
or lower threshold.<br>
<br>
Matt<br>
<br>
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---------------------------------------------------------------------<br>
Matthew Shepherd, Associate Professor<br>
Department of Physics, Indiana University, Swain West 265<br>
727 East Third Street, Bloomington, IN 47405<br>
<br>
Office Phone: +1 812 856 5808<br>
<br>
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