[Sane-analysis] Minutes of April 7 Analysis Meeting

[Narbe Kalantarians]

_*Hovhannes:*_ Redoing ANN to correct for the variable transfer between 
ROOT (where ANN is 1st being ran) and fortran (analysis engine). Will 
implement this into the GEANT once it is ready.


Oscar mentioned to start thinking about binning (x, Q2, W) for the 
asymmetries. This would be based on the resolution seen from the data.


_*Hovhannes/Anusha:*_ Looking at ep elastic data from CH2. There is not 
a small number of pi0's in this data sub-set. But should be able to use 
for pi0 calibration.


_*Anusha:*_ Looked further into cause of the correlations mentioned the 
past 2 meetings. Tried changing values for the offset of the slow 
raster-y but not much was learned from this. Then looked at sieve-slit 
runs, where it seemed that changing the sign of the slope of the slow 
raster-y eliminated the correlations. This is opposite to the sign for 
x,y,p-diff plots seen before.  The runs around this time may have had a 
problem with the slow raster drivers. Will check into this.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Ep_Elastics 
(scroll towards bottom)


_*Narbe:*_ Gave status of packing fraction and dilution factor work done 
by Hoyoung. It seems that a significant portion of the packing fractions 
have been obtained for the HMS parallel data as well as some of the 
dilution factors. Some of the runs (5.9GeV) have tracking efficiency 
problems, as mentioned in previous meetings. Will try using the 
scintillator scheme from Anusha to try to fix this. Will meet with 
Seonho this Friday, when he's at JLab to see where to pick up so to 
finish this for the parallel data.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Hykang 
 

_*Jon: *_Looking at Cerenkov efficiencies for the parallel data by 
plotting the physics angles theta(scattered) vs. phi(azimuthal). Did 
this for each of the 8 Cerenkov mirrors. Will combine them and compare 
with the GEANT-MC(weighted by X-section).
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/User:Jrmulholland#To_Do_List


_*James:*_ Started looking at Cerenkov TDC peak positions for the 
parallel data. Will plot these positions vs. run# and compare with what 
Whitney has on his database.
http://www.jlab.org/~jmaxwell/tdc/


As always, please let me know if I missed something or got it wrong.

Next meeting will be April 14th at 3:30pm.
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