[Sane-analysis] Minutes of March 17 Meeting

[Narbe Kalantarians]

_*Hoyoung:*_  Working on finishing packing fractions and dilution 
factors for HMS parallel data.
http://www.jlab.org/~hykang/pf/20100317/

Looked at parallel 4.7GeV NH3 runs at HMS theta=20.2 degrees and 
P=3.2GeV/c: 73004 (bottom) and 73012(top).

 These seemed to give very large  packing fraction values. The yields 
could be higher than what was seen for previous runs for same HMS 
setting: 73014 (top) and 73019 (bottom). And if so this could be due to 
tracking efficiencies. Will look into that.
_*
Hovhannes/Narbe:*_  Made a version of the SANE GEANT with the neural 
network implemented and also the polynomial corrections (for magnetic 
field) for physics phi and theta. The corrected and reconstructed 
physics angles agree reasonably with the generated data. The corrections 
have been done for perpendicular and parallel is in progress. The 
correction was done for generated energy, though. Will look at it being 
done for reconstructed energy.

Plan on including photons. This will require looping over clusters, 
which (hopefully)shouldn't be too difficult. This can possibly help in 
mitigating the neural network causing the pi0 mass to drift at higher 
energies.

_*
Anusha:*_ Looking into what is causing the correlations she reported 
seeing last week:

/--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/


Will meet again next week at 3:30pm.

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