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<u><b>Jon:</b></u> Applying an earlier model of the e+e- background
correction, resolves the discrepancy/gap seen in the 2 beam energies
for A_1(x), as well as the W-dependence in the para and per
asymmetries. <br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/JrmA1PairBGCorrection">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/JrmA1PairBGCorrection</a><br>
Will try with more recent and more sophisticated model, which has the
position dependence seen in Hovhannes' study.<br>
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<u><b>Whit:</b></u> Did an efficiency study for the Cerenkov. Looked at
energy dependence and at each individual mirror. Uses an energy cut E'
> 0.8 GeV; will try higher cuts. The Cerenkov efficiencies seem
fairly uniform, with the bottom mirrors losing efficiency at higher
energies. <br>
<a class="moz-txt-link-freetext" href="http://quarks.temple.edu/~whit/SANE/sane_meetings/2_8_2012/">http://quarks.temple.edu/~whit/SANE/sane_meetings/2_8_2012/</a><br>
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<u><b>Narbe:</b></u> After correcting GEANT to randomly seed
events/iterations and correctly accounting for aluminum (windows, nose,
and tail pieces), the df's are smoothed out and seem to compare fairly
well with his model calculations (F1F209) and is consistent with those
done James and Jon, using SLAC_DIS.<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Kinematics#02.2F08.2F2012">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Kinematics#02.2F08.2F2012</a><br>
Will do a new iteration of df's for James to use once enough statistics
are gathered. <br>
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<u><b>Anusha:</b></u> Obtained and applied elastic dilution factors for
the elastic, single-arm asymmetries, as well as the proton form-factor
ratio GEp/GMp. The ratio doesn't change significantly, but the error
improves some.<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Dilution_Factor_from_NH3#Updates_on_02.2F08.2F2012_.28Used_df.27s_for_Top_and_Bottom_target_seperately.29">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Dilution_Factor_from_NH3#Updates_on_02.2F08.2F2012_.28Used_df.27s_for_Top_and_Bottom_target_seperately.29</a><br>
Applied aluminum to the Carbon target in the MC. This shows a
contribution of ~7%, which seems reasonable, given that aluminum would
factor more for C than for NH3.<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Updates_on_02/08/2012-C_with_Al_added">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Updates_on_02/08/2012-C_with_Al_added</a><br>
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<u><b>Hoyoung(Feb 9):</b></u> Trying to finish last details for packing
fractions. Some of the C/C+He runs give a large discrepancy for data/MC
~0.87, which over-corrects corresponding packing fractions, making them
unrealistic. Has repeatedly checked and doesn't seem to be making any
mistakes of his. So the C_He might not be well understood in the MC.
These are the earlier 4.7GeV perp runs. Other than that, the 5.9GeV
perp, and latter 4.7 perp packing fractions seem reasonable, along with
those for parallel.<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Packing_Fraction_using_pol_hms_single">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Packing_Fraction_using_pol_hms_single</a><br>
Will try comparing the NH3 data for these to see if there is some
discrepancy in the data. In the end, though, the decision may be made
to use the more reasonable packing fractions from another setting that
used the same loads and inserts.<br>
Made progress in HMS asymmetries. Calculating error-bars, correcting
for polarization, charge, and dilution factors. <br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/hykang/HMS_asym/20120209/">https://hallcweb.jlab.org/experiments/sane/hykang/HMS_asym/20120209/</a><br>
Will use same code for elastic radiative tail (MASCRAD) that James and
Jon are using for their asymmetries.<br>
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***During the next 2 meetings, those with talks for the collaboration
meeting will present their drafts.<br>
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As always, please let me know if I missed anything or if I made any
mistake(s).<br>
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Next meeting will be Feb 15, 3:30 PM (JLab time)<br>
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