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<u><b>James:</b></u> Made a table giving half-wave plate status for
each run.<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Half_Wave_Plate_Notes">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Half_Wave_Plate_Notes</a><br>
Found what was causing unexplained sign change in asymmetry for some of
the runs. The HWP status was not written in for these specific runs.
This corrects the sign of the asymmetries for these runs. Also,
redefined asymmetry calculation changing sign of the asymmetries,
making them consistent with world A_1 data.<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Raw_Asymmetries#Asymmetry_Sign_Flip_Fixed.2C_Overall_Sign_Change_Made:_12.2F1.2F2010">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Raw_Asymmetries#Asymmetry_Sign_Flip_Fixed.2C_Overall_Sign_Change_Made:_12.2F1.2F2010</a><br>
Will revisit tracking study this coming week.<br>
<br>
<br>
<u><b>Hovhannes:</b></u> Looking at Cerenkov efficiency. Comparing data
to (GEANT)MC. Applies some normalization to obtain the relative
efficiencies. They don't appear to be uniform. The lower region of
BigCal and corresponding to the larger polar angle theta appears to
have low efficiency. One possibility Hovhannes suggested is one of the
Cerenkov mirrors might have been misaligned. 2 of the bottom mirrors
weren't working too well during the running. The really high
efficiencies in the upper parts around the edges are from
over-correcting.<br>
Looked at asymmetries in slices (~2degrees) of azimuthal angle phi.
Applying efficiency correction seems to make asymmetries get more
consistent<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Cerenkov_efficiency_and_angle_dependent_asymmetry">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Cerenkov_efficiency_and_angle_dependent_asymmetry</a><br>
Will look at theta distributions in bands of theta (~5-10 degrees).
Whit will take look at this as well with his GEANT4 MC.<br>
<br>
<br>
<u><b>Jon:</b></u> Redid BigCal energy resolution study using looser
cuts from 1st attempt, which was cutting out too many events. Now sees
a more symmetric pi0 mass peak. Gets <br>
<br>
sigma_E' = 0.2021/sqrt(E') - 0.06944<br>
<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/JrmEResolution">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/JrmEResolution</a><br>
Will loosen cuts some more to get flatter background, to combine with
Gaussian for fitting.<br>
<br>
<br>
<u><b>Anusha:</b></u> Comparing dat/MC for NH3 run to study nitrogen-14
contribution. Using NH3 run 72790 and scaling with carbon run 72782,
obtains same packing fraction of ~47.9% as what Hoyoung had calculated.
It should be noted that this MC is different from what is used for
getting the packing fractions and this is also a different analysis.
This is one of the runs from a specific load that produce a small
packing fraction in the perpendicular data taking and a larger packing
fraction in the parallel data taking after it.<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/MC_with_NH3">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/MC_with_NH3</a><br>
Will look at slow raster distributions and compare data/MC to see if
there is some evidence of beam being in a different spot.<br>
Wrote an abstract to submit for William&Mary graduate research
symposium, due this Friday Dec 3rd.<br>
<a class="moz-txt-link-freetext" href="http://www.jlab.org/~anusha/Talks/WMAbstract.pdf">http://www.jlab.org/~anusha/Talks/WMAbstract.pdf</a><br>
<br>
<br>
<u><b>Narbe:</b></u> Prepared spreadsheet that generates (kinematic)
binning table for BETA. This operates on the energy resolution obtained
by Jon and generates bins via recursion relation. inputting beam energy
and Q^2 value, generates tables in the format<br>
<br>
Q^2 E_Beam E' Theta x W <br>
<br>
The E', x, and W have also their upper and lower edges written out. <br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Kinematics">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Kinematics</a><br>
Will check to see if widths are reasonable and then talk with Eric
Christy to start getting radiative corrections, as well as Frank
Wesselmann for getting the polarized radiative corrections.<br>
<br>
<br>
<u><b>Hoyoung:</b></u> (Dec 2) Redid HMS asymmetries for perp runs
(72824-72831) using beam polarization table prepared by James. Looked
at W dependence of these asymmetries. One of the runs (72826) has an
opposite sign for its asymmetry. Flipped its sign to make it agree with
the other runs. Other than that, asymmetries seem reasonable. Also
applied dilution factor. Looked at asymmetries for parallel runs
(73013-73018). These seem fairly consistent. Similarly, applied
dilution factor and look at W dependence. Significantly increased MC
statistics for getting dilution factors. <br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/HMS_total_asymmetry">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/HMS_total_asymmetry</a><br>
Will work with Mark to implement live time corrections. After covering
W ranges, will work on radiative corrections using similar method used
by Karl for RSS. Will also look at slow raster distributions comparing
data/MC as well as beam positions to cross-check with Anusha.<br>
<br>
<br>
As always, please let me know if I missed anything or if I made any
mistake(s).<br>
<br>
Next meeting will be Dec 8th at 15:30.<br>
<br>
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