[Sane-analysis] Minutes of March 23 Meeting

[Narbe Kalantarians]

_*James:*_ Looking at some replayed runs with tighter geometrical 
(Cerenkov) cuts placed by Jon. Looking to see if there is an effect on 
the asymmetries, which doesn't seem to be so. It seems that the timing 
cut has the most significant effect. Thinking about trying some energy bins.
There appear to be some hot channel(s) towards the bottom of the phi vs. 
theta plots.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Raw_Asymmetries#Investigating_Jonathan.27s_Geometrical_Cuts:_3.2F23.2F2011
Posted a draft of a poster to submit to a competition at UVa. Any 
comments/questions/suggestions are welcome.
http://twist.phys.virginia.edu/~jdm2z/poster2011/saneposter2011.png


_*Anusha:*_ Studying effect of slow raster offsets on early CH_2 
elastics runs ,with no B-field. Offsetting SR_X by about +0.43cm seems 
to get agreement between data and MC for ytarg. Offsetting SR_Y by about 
-0.46cm (in addition to the SR_X offset) seems to effectively get 
agreement for the elastic peak between data and MC. This is from getting 
deltaP = Momentum_measured - Momentum_calculated to go to 0.0; without 
the SR_Y offset this is -0.02. Momentum_calc is calculated using the 
(scattering angle).
http://www.jlab.org/~anusha/SANE/epelastics/earlyruns/srast_off/
Will try looking at some of the later CH_2 data that was with (perp)B-field.
Will give a talk on the elastic-asymmetries analysis at the graduate 
student symposium this Friday (March 25th).


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

Next meeting will be March 30th 3:30pm JLab time.



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