[Sane-analysis] Minutes of July 20 Analysis Meeting

[Narbe Kalantarians]

*** Mark mentioned that the computing center is going to be pushing for 
posts to be on more protected sites. This means that it will become 
necessary to post on https sites, which the group site happens to be.
Oscar has prepared directories on the group directory for everyone to 
upload things they plan on showing instead of their own public_html 
directories
/group/sane/www/
The website is then
https://hallcweb.jlab.org/experiments/sane/


_*Luwani:*_ Looking at ratios of e+/e- with (approximate) HMS and BETA 
kinematics.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Ratio_of_Background_Particles_to_Electrons
Will start working on getting this implemented in to the GEANT-MC for 
generating these particles.


_*James:*_ Corrected his code for elastic radiative tail corrections. 
They seem reasonable now.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Radiative_Corrections#Adding_Arbitrary_Target_Field_Orientation:_7.2F20.2F2011
Will try applying to physics analysis.

Looked at physics asymmetries A_1,2 and ssf's g_1,2 with latest 
(Cerenkov and BETA) calibrations.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/A1%2C_A2_and_Structure_Functions#Update_after_New_Calibration:_7.2F20.2F2011


_*Narbe:*_ Working with Mark, got an interpolation routine for 
implementing rad-corrected cross-sections in to the GEANT-MC for the 
dilution factors.


_*Mark:*_ Working with Anusha on the issue of the apparently mysterious 
focal-plane off-sets in the HMS part of the replay. So far there doesn't 
seem to be anywhere in the analysis package for these. Will look at 
things w/o the offsets.


_*Oscar:*_ Comparing ssf's g_1,2 data/FOM. The statistics are known to 
be lower than what was proposed due to known reasons (target and beam 
issues, Cerenkov and BigCal efficiencies). This has a cut of E' > 1.3 GeV
http://twist.phys.virginia.edu/~or/sane/FOM_vs_data.pdf
Estimates that error bars for the 4.7GeV data may decrease by ~> 30%, 
after some of the data gets recovered (via better calibrations). Will 
also try looking with E' > 0.8 GeV.


_*Hoyoung (07/21/11):*_ Replayed some of the carbon runs with the 
updated HMS replay. For the most part the data/MC don't agree and appear 
worse than before. There may be a problem with the kinematics database 
file being used, possibly the slower raster slopes. Mark will check this 
out.
https://hallcweb.jlab.org/experiments/sane/hykang/20110721/


As always, please let me know if I missed anything or if I have made any 
mistake(s).

Next meeting will be July 27th at 3:30pm (JLab time).


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