[Sane-analysis] Minutes of March 10 Analysis Meeting

[Narbe Kalantarians]

_*Anusha:*_  Looking at ep elastics, specifically plots of  x-diff & 
y-diff versus slow-raster_x & slow-raster_y, versus xtar & ytar, and 
versus xptar & yptar. This is to check the latest calibrations. Saw some 
correlations that need some further investigation, such as whether 
correct signs are used for field or slow-raster relative to BETA 
coordinate system.

https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Ep_Elastics


_*Oscar:*_  Made database of CH2 runs. This can be found at "Run Info", 
under "Alternative databases".
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Main_Page#Run_Info


_*Hovhannes:*_  Looking at mass of final states W distributions for 
BETA. Had trouble seeing the proton peak, even after subtracting the 
carbon (for background subtraction). Oscar and Mark mentioned that the 
resolution would cause it to be very wide (~200MeV or so), and thus make 
it very difficult to see. Mark suggested trying cuts on x-diff and 
y-diff. Oscar suggested perhaps using some fiducial region on the 
surface of BigCal, to cut out edges.


_*Narbe:*_  Made some generated and reconstructed ntuples for Oscar to 
look at for the phi vs. theta study he mentioned last week. The 
reconstructed theta seemed to be reasonable for the case of parallel 
field and no field, but a little off for perp field. This is probably 
due to reconstruciton being originally done with some empirical 
correction that doesn't seem to  be compatible with per field. The 
reconstructed energy seems to be reasonable.

http://www.jlab.org/~rondon/sane/analysis/geant/tht-clust_tht.gif
http://www.jlab.org/~rondon/sane/analysis/geant/p-clust_e.gif
(black=thrown, red=reconstructed)

Working on reconstructing theta and phi from simulation in same way 
Hovhannes does with the Analyzer for data. Seemed to be getting sensible 
numbers before applying polynomial corrections. Not completely sure he's 
applying it correctly though. 


_*James: *_ Working on writing script to be able to run GEANT in batch jobs.


Next meeting will be March 17th at 3:30pm
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