[Sane-analysis] Minutes of Feb 1 Analysis Meeting

[Narbe Kalantarians]

_*Anusha:*_ Applying dead-time correction to form-factor ratio via 
asymmetries. This seems to give some improvement. Still needs to apply 
the dilution factors, which are in progress. Also checking with 
HMS_momentum acceptance. The result is fairly encouraging.
The left panel plots are with -8 < deltaP < 10, right plots are with -8 
< deltaP < 12.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Dilution_Factor_from_NH3#Updates_on_02.2F01.2F2012_.28Ar_corrected_with_D.T._and_compare_hsdelta.3C12.29


_*Whit:*_ Looking at reconstructing neutral pions in MC with 
(permutations of) 3 cluster events: photon + electron + positron (green, 
red, blue, respectively). Using neural network method for reconstructing 
the events.
http://quarks.temple.edu/~whit/SANE/sane_meetings/2_1_2012/
Needs to apply energy cut (E' > 0.6 GeV) to account for resolution effects.


_*Narbe:*_ Had mistake in error-bar calculations for dilution factors, 
namely that they account for the packing-fraction dependent densities 
and lengths of target components. Correcting this the error-bars appear 
to be more believable. The MC results still jump some, which might be 
statistical. Adding more statistics to be sure of this. The encouraging 
thing is that the df's fro mthe MC average to the those calculated with 
the F1F209 model.
https://userweb.jlab.org/~narbe/SANE/analysis/dfs/020112/


_*Hovhannes:*_ Looking more at the pion contribution, comparing data and 
MC. Made similar plots shown at the last meeting for all the 
configurations. From this it seems that the efficiency gets worse at 
higher energies, which could be related to which Cerenkov mirrors are 
corresponding to the events. The upper mirrors seem to have better 
focusing than the lower ones.
https://userweb.jlab.org/~bhovik/SANE/
pos_[setting][energy].ps
Whit will look at the Cerenkov spectrum; # photo-electrons for each mirror.


**For the upcoming collaboration meeting, those who have talks will plan 
on posting drafts by the 15th, no later than the 22nd.


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

Next meeting will be Feb 8 at 3:30 PM (JLab time).


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