[Sane-analysis] Minutes of April 27 Analysis Meeting

[Narbe Kalantarians]

_*Anusha:*_ Did data/MC comparison using azimuthal angle correction. 
Applying it alone and w/o any slow-raster offset gives some improvement. 
Adding a SRx offset seems to give the best improvement. Adding a SRy 
offset seems to over-correct, possibly from changing the azimuthal. Will 
try applying SR x&y offsets before azimuthal correction to see what 
happens. Will try these corrections with the parallel Carbon data.
http://www.jlab.org/~anusha/SANE/E_HMS/correlation/az_corr/mccomp72790_az0neg0.15_az_corrpos0.150d1_noxoff_bkwd.gif
http://www.jlab.org/~anusha/SANE/E_HMS/correlation/az_corr/


_*James:*_ Write-up of elastic radiative tail correction. In process of 
finalizing it. Will start applying this to asymmetries.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Radiative_Corrections#Draft_Tech_Note_on_Radiative_Elastic_Tail:_4.2F27.2F2011


_*Jon:*_ Put together a routine for the physics ntuples to produce 
skimmed ntuples for the primary physics analysis. In progress to be 
finalized. Tested and got asymmetries consistent with what James is getting.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/JrmPostProcess


_*Luwani:*_ Revised draft of talk for PAS meeting this Saturday (04/30/11).
https://hallcweb.jlab.org/experiments/sane/wiki/images/f/f2/APS_April2011.pdf


_*Oscar:*_ Looked at false asymmetries from carbon runs. 
http://www.jlab.org/~rondon/sane/analysis/asym/c_runs/livet-charge_a1-Merged.PDF
Tried many combinations/permutations
http://twist.phys.virginia.edu/~or/sane//analysis/charge_a/livetime_c_runs.pdf
And got some interesting results
http://www.jlab.org/~rondon/sane/analysis/asym/c_runs/livet-charge_a3.pdf


_*Hoyoung(04/28):*_ Looking at deadtimes. Added total trigger, equal to 
gscaler_change(510), to replay code and written in to chargetemp.dat 
file. Working on minimizing the false asymmetries from Carbon data  by 
fitting the correlation between the trigger and scaler and then looking 
at the chi^2 relative to degrees of freedom. Gets answers fairly similar 
to Oscar's. Tried applying to NH3 data. Will work on cross-checking with 
Oscar.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Deadtime


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

Next meeting will be May 4th at 3:30pm JLab time.
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