[Sane-analysis] Minutes of October 5 Analysis Meeting

[Narbe Kalantarians]

_*Jon:*_ Extraction of kinematic coefficients for physics asymmetries 
A_1 and A_2. Plotting these for both measured asymmetries A_180 and 
A_80. There is slight deviation between A_180 and A_80, of order of a 
few %, this is reasonable. Calculating at event level.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/JrmCoefficients
Will tag the polar and azimuthal angles and calculate the coefficients 
by target field setting.


_*James:*_ Looked further on the runs exhibiting strange target 
polarization. Used the decay curve-fit that seems to give the most 
general description to update the off-line polarizations for these 
several runs.  
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Final_Target_Polarization#More_on_troublesome_runs:_9.2F28.2F2011

Made progress on applying the elastic radiative tail corrections. This 
seems to improve the asymmetries and is still in progress. Applying per 
bin and run. The AAC model is the on that is asymptotic.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Radiative_Corrections#Rad_Tail_Results:_10.2F5.2F2011
Will plot the actual corrections.


_*Hovhannes:*_ Worked on polarized radiative corrections. Comparing to 
CLAS(eg1b) data. The pol. radiative corrections appear to get more 
sizable as Bjorken x gets smaller. Will compare with some other models, 
including LSS.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Internal_Radiative_corrections


_*Narbe:*_ Obtained dilution factors for BETA using SANE binning adn 
preliminary packing fractions. They are around reasonable vlaues but 
there are jumps.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Kinematics#10.2F05.2F2011
Will check on this by looking at narrower Q^2 bins with width 500 MeV.

Setting up to look at HMS asymmetries. Plans on having something to show 
next week.


_*Anusha:*_ Looking at ytar and yptar as functions of invariant mass W 
and comparing both data and MC. Sees some  correlations in the MC.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Find_srast_x/y_offsets#Update_on_10.2F05.2F2011
Will try comparing reconstructed to initial/generated in the MC and als 
otry turning off multiple scattering and radiative corrections.


_*Luwani:*_ Started looking at the GEANT-MC for his pi0 production studies.


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

Next meeting will be October 12 at 3:30pm (JLab time).


-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/sane-analysis/attachments/20111006/037e9020/attachment.html