[Sane-analysis] Minutes of October 20 Analysis Meeting

[Narbe Kalantarians]

_*Hoyoung(from 10/19/10):*_ Looked at HMS asymmetries for the 
perpendicular runs that were showing the sudden positive trend in the 
BETA asymmetries (72824-72832). Doesn't see that trend in the HMS 
asymmetries. Charge asymmetries seems large. Using the information from 
the scaler files (gen[run#].txt) instead of ntuple variable, but they 
should be the same. Will check on this and look at some more HMS 
perpendicular asymmetries.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/HMS_total_asymmetry
At the phone meeting on Tuesday we determined that the packing fractions 
for the parallel-field data is good enough to proceed with getting the 
dilution factors. There are still a perpendicular few runs giving small 
packing fractions from loads that gave more reasonable values in the 
parallel part. As mentioned before, these runs show a gross mismatch 
between data and MC mostly looking at the xptarg and delta P variables. 
Will try plotting xptarg vs. beamz(vertex) to see if there is a correlation.
Hoyoung will be at JLab next week and stay for about 1.5 months.


_*James:*_ Comparing phi from the Bdl given by the GEANT to the physics 
phi. The work is in progress.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Particle_Tracking_to_Front_Tracker%2C_Target#Hovhannes.27_Bdl_phi_vs._physics_phi_e:_10.2F20.2F2010
Posted a draft of his DNP 2010 talk, discussing mostly the data analysis 
details
http://twist.phys.virginia.edu/~jdm2z/santafe/Maxwell-DNP-2010.pdf


_*Jon:*_ Energy resolution study related to pi0. Looking at clusters and 
varying the energies. The pi0 mass peak doesn't appear to be Gaussian, 
but that might be from the higher energy background being on one side of 
the peak.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/JrmEResolution
Will have a draft of his DNP 2010 talk soon, discussing mostly the 
physics motivation.
 

_*Anusha:*_ Looking at the raw and physics elastic asymmetries. Plotted 
both by individual run# and into groups by load. The asymmetries seem 
large. This could be from the dilution (using 60%) being underestimated. 
Will print asymmetries into table form (run#, counts by helicity, 
charge, dead-times) to get better idea of what is going on.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Raw/Physics_Asymmetry
Posted a draft of her talk for DNP 2010, discussing the elastic asymmetries
http://www.jlab.org/~anusha/Talks/DNP-2010.pdf


As always, please let me know if I missed anything or made any mistake(s).

Next meeting will be October 27 at 15:30.

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