[Halla_pi0] pi0 meeting

[richard lindgren]

Hello Pi Zeros,

Last week Vladimir, Cole, Nilanga, Khem and myself  attended the pio meeting on Monday Aug 30.
We decided that it would be best to have meetings at a different time that allowed Khem to meet at a more convenient time.
In discussing this with Vince earlier, it appears that he and Doug  have meetings on Mon, Tues, and Wed mornings so that time is not available to meet on Skype with Khem. Instead of meeting during the weekday, we suggest to have meetings on Skype with Khem at 10:00 PM on Wednesday nights. Is this agreeable to those who are concerned and want to participate in these meetings? Do you have any other suggestions? If not, we will try this to see how it works.  The first meeting will be this Wednesday night at 10:00 PM.

The goal at this time is for Khem with Cole's help to:

1) Re-analyze runs where the beam was stable during second half of data taking without adjusting beam energy in the simulation according to the Tiefenbach readout in the data stream. Discussed during Khem's thesis defense.
2) Correct the "double counting" by not including air gap and HRS window in simulation to improve energy calibration. Compare to elastic scattering.
3) Look at the background again from the window to be sure we are shifting it appropriately with W.  Another point is we should look at (pi^-, p) production from the neutron using MAID or DMT, make Fermi motion corrections, and the use that W dependence normalized to the aluminum window data to make background corrections.
4) Determine systematic error by making cuts on HRS and BigBite acceptances, etc as discussed earlier.
5) Cole will check a few runs at second pass beam energy
6) After checking items 1,2,3 and 4, then we hope we can start preparing a publication for the cross section.

Appreciate hearing any comments from you all.

Richard







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