[Sane-analysis] Minutes of January 25 Analysis Meeting

[Narbe Kalantarians]

_*Narbe:*_ Redid dilution factors with the kinematics bins James uses 
for his asymmetries. Compared averaged dilution factors to check that 
things are consistent with energy, which they are.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Kinematics#01.2F25.2F2012
Double checking that the aluminum is being accounted for correctly.


_*Anusha:*_ Looking at NH3 data/MC for HMS with aluminum contribution. 
This affects the scale factor(s) by ~4%. Sees ~2% contribution at 
elastic peak. Things look reasonable.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Updates_on_01/25/2012-use_pf%3D60%25_and_add_Al_contribution


_*Luwani:*_ Looking at pi0 asymmetry with varying energy cuts. They are 
always consistent with 0.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Average_Pi0_Asymmetry_with_Target_Polarization


_*Hovhannes:*_ Looking at pi0 contribution to data, for 5.9 perp. 
Divided data and MC in to 100 slices along the BigCal blocks. Sees that 
the pi0s dominate at the lower energies (E'<1.3 GeV). For data, pi0s are 
events with the cuts: 1 cluster & Cerenkov hit. The agreement of data/MC 
gets better at higher energies (E'>1.3 GeV) and at higher vertical black 
positions; basically in the Protvino blocks. Things look worse at lower 
energies and lower vertical positions. This is at least partly due to 
the Cerenkov efficiencies beign worse at the lower mirrors.
Sees a considerable amount of positrons.
https://userweb.jlab.org/~bhovik/SANE/pos_perp5.9.ps
Counts or (cross-sections for MC) vs. E'. Left plots are with everything 
plotted together. Right plots are with data normalized to MC, using the 
region 1.1 < E' < 1.5 GeV
Color scheme goes as follows:
black = data
blue = electrons(MC)
red = pi0s(MC)
purple = electrons + pions (MC)
Will look at this for the other energies/configurations.


_*James:*_ Redid asymmetries with the latest dilution factors. The Q^2 
dependence seems to be gone, but there is still a W(invariant mass of 
final states) dependence at W > 2 GeV. This is seen in the parallel and 
per asymmetries as well. Jonathan gets similar results.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/A1%2C_A2_and_Structure_Functions#Update_with_New_Dilution_Factors:_1.2F25.2F2012


_*Hoyoung (01/26/12):*_ Working on finishing the latest packing 
fractions by checking details. Gets really large packing fractions for 
some of the 4.7 perp loads (72213, 72247). Double checked the C+He run 
(72377) used to scale these and it still seems to be considerably 
different from rest; ~0.87, causing what seems to be an overcorrection.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Packing_Fraction_using_pol_hms_single
Will compare NH3(data) rates of these with those with same kinematics 
and loads/inserts (72278, 72281).


The collaboration meeting will be February 27th at JLab. Oscar has sent 
out a tentative agenda.


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

Next meeting will be February 1 at 3:30pm (JLab time).



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