Weekly Meeting Minutes - April 7, 2006

Attending: P. Ambrozewicz, E. Clinton, M. Ito, I. Larin, D. McNulty, Y. Prok, A. Teymurazyan, M. Wood By phone: D. Dale, L. Gan, A. Gasparian, R. Miskimen

Summary of Meeting Discussions:

All. Nominate secretary: Dustin McNulty (next secretary: ?)

All. Approval of last meeting's minutes:

Approved. You can find the previous meeting minutes here. No comments on last weeks meeting minutes.

All. New Business: Itemized below

1: Review of Dustin's pi0 analysis plan outlined on the Wiki Analysis Page:

Discussion of the plan was ~deferred as poeple still need to read and digest the plan.

2: Review and discussion of Mike's Monte Carlo Tool plan outlined on the Wiki Analysis Page under the Tools heading:

So far, the Monte Carlo Analysis plan gives details of the PrimEx simulation package (primsim)--what's in it, what needs to be in it, some of its capabilities, and how to use it.

Monte Carlo Tool plan needs details of psim_digitize -- which creates experimental raw banks from the primsim output file.

Mike mentions that we may want to start having small Monte Carlo meetings to help understand snd develop our simulation packages.

3: Ilya presented table of pi0 statistics to help explain the large differences between his and Dustin's integrated Primakoff yield:

Initially, there was thought to be a large (factor of 3) discrepancy between the two independant yield totals, but from Ilya's table it is seen that much of this difference is reconciled by choice of run set.

The difference between the yields is now at 30% level, but this difference could ~easily be explained by differences in cuts (mainly timing) as well as the timing accidental background subtraction (which is present in one analysis but not the other)...

It was asked that at some future point, Eric's yield totals be added to the comparison.

4: Dan presented some results from a recent simulation designed to study the low energy tail of tagged photon beam:

He threw 1 million 5.5GeV monoenergetic photons through a 0.05Xo target (A=???) and collected the photons coming out.

A plot of the energy distribution of the emerging photons can be found here.

Conclusion--the low energy photons produced by passage through the target are just another type of photon in the target that could create pi0's that are highly inelastic.