[Sane-analysis] Minutes of March 3rd Meeting

[Narbe Kalantarians]

_*Hoyoung:*_  Got set up and produced packing fractions for some 
parallel field HMS data. Will proceed to get remaining packing fractions 
as well as dilution factors for parallel runs.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Hykang


_*Anusha:*_ ep elastic analysis. With latest calibration constants from 
the neural network, the elliptical cut had to be altered. This recovered 
the ep elastic events along with some background. Will work on adjusting 
this as needed.


_*Hovhannes:*_  Showed plots of parallel BETA asymmetries for the case 
of using the helicity scalers with the nominal polarity as well as 
switched. The dead-time distributions are over all the runs combined. 
Will look at deadtime asymmetries as a function of run#.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Parallel_Setting


_*James: *_ Calculated online target polarizations corrected by proper 
Yale Gain card and offline TE values. The deviations in the 
Offline/Corrected Online ratios correspond to the cases of polarization 
drifts and varying polyfit areas.  Also produced data files.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Corrected_Online_Polarization
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/User:Jmaxwell#Important_Links


_*Jon:*_  Looked at distributions of Cluster energy as function of x,y 
position and (azimuthal) phi. Saw some non uniformities. Oscar saw 
similar results making his own plots. Hovhannes mentioned that secondary 
peaks could be coming from non triggering particles, since the 
gain-matching is not the same across BigCal for all the blocks and 
therefore the threshold is differing. Also, that the block size is 
different. For phi<0 the blocks are 3.8x3.8 cm2, while for phi>0 they 
are 4x4 cm2, resulting in different (5x5) cluster sizes. For the plots 
of E_clust vs phi there are some spikes, which could be from the fact 
the energy calibration is huge for some blocks ,possibly due to large 
background, and might require some default values. Oscar suggested 
looking at these distributions with the SANE GEANT, which Narbe and 
James will do. It would also be useful to look at the energy 
distributions in bins of phi. 
 https://hallcweb.jlab.org/experiments/sane/wiki/index.php/User:Jrmulholland#Possible_Issues_With_BigCal


Next meeting will be March 10th.
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