[Sane-analysis] Minutes of April 13 Analysis Meeting

[Narbe Kalantarians]

_*Jon:*_ Did a write-up of the extraction of the physics asymmetries 
A_1,A_2 and spin structure functions g_1, g_2 from the measured 
asymmetries A_para, A_perp
http://twist.phys.virginia.edu/~jrm2zq/sf_deriv.pdf


_*Narbe:*_ Set GEANT to include liquid helium at the edges of the target 
cups and looked at dilution factors. These seem to be reasonable, with 
some fluctuations probably due to statistics.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Packing_Fraction#04.2F13.2F2011
Started looking at external radiative corrections for dilution factors. 
The elastic part of the rad-corrected cross-section seems to be jumping 
around. Will talk with Vahe about this.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Kinematics#04.2F06.2F2011


_*James:*_ Started looking at elastic radiative tail corrections. Met 
with Karl and got started using his code, which uses Andrei Afanasev's 
RADCOR. Using RSS as a basis. Seem to look reasonable at first attempt.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Radiative_Corrections#Starting_with_Elastic_Radiative_Tail:_4.2F12.2F2011


_*Anusha:*_ Looking again at the elastic asymmetries, from the runs with 
scattered electrons detected in HMS. The target polarization was 
negative during this time. Assuming a constant dilution factor of 0.6
http://www.jlab.org/~anusha/SANE/E_HMS/assym/pasym_vs_w.gif
http://www.jlab.org/~anusha/SANE/E_HMS/assym/invar_mass.gif
http://www.jlab.org/~anusha/SANE/E_HMS/assym/asyminfo_total.dat


_*Whit:*_ Looked into scenario of if the target field was reversed.
http://quarks.temple.edu/~whit/SANE/talks/sane_magnet_reversed.pdf
Prepared some tech notes
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Whit#Technical_Notes


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

Next meeting will be April 20 at 3:30pm, JLab time.


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