[Sane-analysis] Minutes of July 21 2010 Analysis Meeting

[Narbe Kalantarians]

_*James:*_ Updated beam polarizations, adding in information for 
1/2-wave plate and Wien angle. Talked with Dave Gaskell , who will 
update the fit.
Looked at  raw asymmetries , factoring in beam&target polarizations and 
dilution factor, based on packing fractions from a particular HMS 
setting (parallel, 3.2GeV, 20.2degree). This gives a preliminary physics 
asymmetry A_parallel, per run. The dilution factor is more valid for DIS 
region than resonances. Oscar suggested taking a weighted average of 
packing fractions for further study of the asymmetries. Will try 
applying dead/live-time corrections and start with kinematic binning, 
startign with 1.9<W<3.0 region. Planning on finalizing target 
polarization calculations i.e., the errors for calibration constants.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Beam_Polarization_Per_Run#Closer_to_Done:_7.2F16.2F2010
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Raw_Asymmetries#Asymmetries_Updated_with_Statistics.2C_Toy_Dilution:_7.2F21.2F2010


_*Oscar:*_ Doing qualtiy checks for the asymmetries. Looking 4.7GeV 
parallel asymmetry distribution, checking errors and chi-square. Sees a 
non-Gaussian/non-symmetric distribution per bin for asymmetry value.
http://www.jlab.org/~rondon/sane/analysis/asym/para_4.7/

Applied off-line beam and target polarizations to update FOM. Sent 
e-mail yesterday regarding this:

"As a result, the total FOM hours have increased by 18, dominated by
the 5.9 GeV 80 deg increase of 10 h. Since the online live time numbers
I was using have been superseded, redoing the FOM with off-line values
is pending the full replay of all runs with the latest analyzer.

A new table is posted on the wiki under "Analysis", "Updated run
summary", for use in future talks, reports, etc.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Main_Page#Analysis"
These should be the numbers to use in talks from now on.


_*John:*_ Looking at lucite efficiencies and comparing measured with 
expected, where expected is projecting from tracker + BigCal.  
Efficiencies = information from lucite / information from x,y_clust 
appear to be lower than expected. Will look further into this. For 
resolution, taking difference of measured - expected. Apparent 
double-peak for y_diff consequence of lucite_y being integer in value, 
giving jump (resolution issue). Working on getting efficiency for 
lucite_y for each bar.
http://hallcweb.jlab.org/experiments/sane/german/X_luc_pred_eff_72961.eps
http://hallcweb.jlab.org/experiments/sane/german/Y_luc_pred_eff_72961.eps
http://hallcweb.jlab.org/experiments/sane/german/XY_diff_gauss_72961.eps


_*Luwani: *_Looking at cluster energy distribution (e_clust) for photons 
and electrons. Isolating electrons and photons by cutting cer_h>0,=0, 
respectively. No trigger-type cuts applied right now. Working on 
isolating pi0 events, by reconstructing pi0s similar to what Hovhannes did.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Electron_plots


As always, please let me know if I missed anything or made a mistake.


Next meeting will be July 28th.
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