[Sane-analysis] Minutes of Feb 22 Analysis Meeting

[Narbe Kalantarians]

_*Narbe:*_ Produced dilution factors with corrected radiative 
corrections (not post-target radiating twice, only with GEANT), and 
components being accounted for correctly. This is with limited 
statistics, but will let James and Jon use as input for asymmetries 
until more statistics are accumulated.
https://userweb.jlab.org/~narbe/SANE/analysis/dfs/021512/newRCs/lim_stat/


_*Jon:*_ Posted draft of his talk for the collaboration meeting, going 
over energy resolution and binning.
http://twist.phys.virginia.edu/~jrm2zq/BinningAndResReport.pdf


_*James:*_ Posted updated draft of his talk for the collaboration 
meeting, going over polarizations.
http://twist.phys.virginia.edu/~jdm2z/sane/sane_2012.pdf


_*Whit:*_ Posted draft of his talk for the collaboration meeting, going 
over particle ID.
http://quarks.temple.edu/~whit/SANE/talks/sane_cherenkov_efficiency_warmstrong.pdf


_*Hovhannes:*_ Posted draft of his 2nd talk for the collaboration 
meeting, going over asymmetries
https://userweb.jlab.org/~bhovik/SANE/Asymmetry.pdf
 

_*Luwani:*_ Looked at pi0 asymmetries with newly replayed ntuples. Sees 
hint of an asymmetry for parallel, but with large error bars, due to low 
statistics.
https://userweb.jlab.org/~lzwano/feb_22-2012/
Will make tables of these asymmetries sorted by energy, target field, ...


_*Oscar:*_ Posted a writeup on background asymmetries and dilution, 
going over how the expression is derived.
https://userweb.jlab.org/~rondon/analysis/pairs/aparaper_sane_bkgd4.pdf


_*Hoyoung (02/23/12):*_ Looked at one of the runs giving really huge 
packing fractions (72213), comparing to run giving reasonable packing 
fraction (72828), using the same target material/load. Normalizing to 
charge, gives a ratio fairly close to unity (~1.05).  Oscar  asked if 
BCMs might be an issue, considering that they may not have been 
calibrated well enough for the early runs.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Packing_Fraction_using_pol_hms_single#2012.2F02.2F23
Will try a couple of things:
1) Try running MC with 70% PF for input and see what happens 
interpolating 50 to 70% instead of the usual 50 -60%
2) Scale the PF for 72828 with the ratio of yields (Y_72213/Y_72828) to 
use as a PF for 72213.

Posted a draft of his talk for the collaboration meeting, going over HMS 
asymmetries and some on PF's
https://hallcweb.jlab.org/experiments/sane/hykang/talks/Kang_HMS_asymmetries_draft20120223.pdf


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

Next meeting will be February 29th at 3:30 PM (JLab time).



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