[Halld-cal] pi0 reconstruction update

[Shepherd, Matthew]

Hi all,

Attached is an updated version of the slides
from today's meeting.  I'm increasingly convinced
that the peak I showed is indeed pie and not turkey.
I might have two flavors of pie also:  one with a little
bit of strangeness stirred in.

The definitive proof will be in a plot of E_cluster / p_track.
There are some scale factors that have to be adjusted
depending on where in the analysis chain one gets the
E_cluster value.  (I guess it is a semi-blind test for the
person who is producing the plot.)

I also expect E/p for electrons to have some mild momentum
dependence.  As p increases the ratio should also
increase because of the fact that the DAQ sparsification
thresholds are fractionally less significant for larger
energies.  (I think I see this same effect as a slight
dependence of the pi0 mass on the photon energy cut.)
The effect should be reduced with increased PMT HV
or lower threshold.

Matt





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Matthew Shepherd, Associate Professor
Department of Physics, Indiana University, Swain West 265
727 East Third Street, Bloomington, IN 47405

Office Phone:  +1 812 856 5808

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