[Sane-analysis] Minutes of Oct 26 Analysis Meeting

[Narbe Kalantarians]

_*Narbe:*_ Obtained dilution factors (df's) using the new kinematic 
binning based on varying Q^2 widths (+/- 15%). They seem a little high, 
but within reasonable limits. Is working on comparing calculated df's 
using the cross-section model (F1F209). Will revisit looking at these 
with generated W and x.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Kinematics#10.2F26.2F2011


_*James:*_ Comparing methods of calculating live-times. Looking at 
live-time asymmetries and comparing Oscar's approximation to the 
live-time written to ntuple (using Hovhannes' and Hoyoung's results).
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Dead_Time

In process of obtaining asymmetries using new kinematics and df's.


_*Anusha:*_ Comparing data/MC for  parallel and perpendicular B-field 
runs as well as Carbon. Comparing the tracking efficiency estimations; 
it seems the older method is more accurate. Most of the difference from 
tracking efficiency is seen in runs with lower statistics/rates. Will 
check with higher statistic runs and also some without slow raster to 
see get a further handle on beam position.   
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/C_runs_with_Perp._Field_ON#Updates_on_perp_C_.2872782_and_72436.29_10.2F26.2F2011


_*Oscar:*_ Looking at fitting physics asymmetry A_1. Comparing A_1 and 
A_parallel; they seem to have a reasonable relation, but there is a 
notable difference in the 4.7 and 5.9 [GeV] data. Also, the 4.7 [GeV] is 
more related to resonances region and 5.9 [GeV] to DIS. Plotted momentum 
transfer Q^2 vs scaling variable x_Bjorken and compared Q^2 and 
invariant mass W. From this saw a dependence on W came to the conclusion 
that
1) May need to look at dependence of Q^2 and W, rather than x_Bjorken, 
becasue x_Bjorken mixes W's.
2) A_1 may not be independent of Q^2
Also, there are some overlapping W bins that could be merged.
https://userweb.jlab.org/~rondon/analysis/asym/Q2/A1dis.pdf


_*Hoyoung(10/27/11):*_ Revisiting packing fractions (pf's) with updated 
MC and replay for HMS. The data/MC seem to compare reasonably but there 
now seems to be less statistics-wise with the MC, causing the dat/MC 
ratio to be lower than 1 by ~7-8%. Will look at the preliminary pf's 
that were unusually large (~70+%).
https://hallcweb.jlab.org/experiments/sane/hykang/pf/20111027/


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

Next meeting will be November 2nd 3:30pm (JLab time).


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