[Sane-analysis] Minutes from March 24th Meeting

[Narbe Kalantarians]

_*Hovhannes & Jon:*_ Started looking at efficiency maps, which is a 2d 
plot of physics angles theta(scattering) vs. phi(azimuthal). This will 
involve looking at regions of phi for efficiency dependence and 
normalizing to the bin(s) of maximum efficiency. Jon will do this for 
the parallel runs.


_*Whitney:*_ Will prepare a table for Cerenkov information. This will 
list date, run#, HV, iron plate(s) in/out, ...


_*James:*_ Will start doing a consistency of the energy cut (E > 1.2 or 
1.3GeV) check for the parallel runs.


_*Anusha:*_ Looking at elastic e-p coincidence data from CH2 (no 
magnetic field) 5.9GeV runs. Made plots of x, y, and P diff (= measured 
- predicted) as function of slow raster x & y. Sees correlations for x & 
y. Tried switching the sign on the slope of the SR. This improved the 
y-diff, but not the x-diff. Hovhannes pointed out that the SR is not 
calibrated for this period and that could affect the reconstruction. 
Will look into this.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Ep_Elastics 


_*Hoyoung:*_ Did the packing fractions for the parallel runs. Correcting 
with the carbon data made the 4.7GeV parallel data give reasonable 
packing fraction values, averaging about 60%. The 5.9GeV parallel data 
gives varying packing fractions. This can be accounted for with the fact 
that the HMS DC was having gas problems, which affected the efficiencies
https://hallcweb.jlab.org/hclog/0903_archive/090308152706.html
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Hykang
Mark mentioned that Anusha has a way for correcting this and Hoyoung 
will talk with her about using it.
Should have the dilution factors within about a week.
For those who don't know, Hoyoung will be going to basic training soon 
for his civil service and will return around May. Seonho will keep us 
informed/updated.
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