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<p>Folks,</p>
<p>Please find the minutes below and at</p>
<p> <a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_16,_2017#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_16,_2017#Minutes</a>
.</p>
<p> - Mark</p>
<p>__________________________________</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Start Counter Meeting, November 16, 2017,
</span><span class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> FIU </b>: Mahmoud Kamel</li>
<li> <b> JLab </b>: Thomas Britton, Eugene Chudakov,
Mark Ito (chair)</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/hoRYA">recording of this
meeting</a> on the <a rel="nofollow" class="external
text" href="https://jlab.bluejeans.com/">BlueJeans
site</a>. Use your JLab credentials to authenticate.
</p>
<h3><span class="mw-headline" id="Announcements">Announcements</span></h3>
<p>Mark noted that the next step in run preparation is to
complete Hot check-Out for the start counter. That
should start this week.
</p>
<h3><span class="mw-headline"
id="Review_minutes_from_the_last_meeting">Review
minutes from the last meeting</span></h3>
<p>We went over the <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_2,_2017#Minutes"
title="GlueX Start Counter Meeting, November 2, 2017">minutes
from November 2</a>.
</p>
<p>Mahmoud asked for 5 M bggen events from Thomas once the
code from the impending reconstruction launch
stabilizes. These will be used for comparison between
Monte Carlo and data.
</p>
<h3><span class="mw-headline"
id="Update_on_attenuation_corrections">Update on
attenuation corrections</span></h3>
<p>Mahmoud presented <a rel="nofollow" class="external
text"
href="https://halldweb.jlab.org/talks/2017/SC_Meeting_11_16_2017.pdf">slides
on his latest work</a> on attenuation corrections. He
fits the dE/dx distribution in each paddle separately
for different bins in distance-from-photo-detector. He
then fits to two exponentials, one in the straight
section, one in the bend+nose section where the
continuity between the two is enforced at the boundary.
The resulting correction makes a visible improvement in
proton-pion separation. Please see his slide for
details.
</p>
<h3><span class="mw-headline" id="NIM_Paper">NIM Paper</span></h3>
<p>Mahmoud finished all of the requested attenuation plots
for the paper and passed them on to Werner Boeglin.
</p>
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<pre class="moz-signature" cols="72">--
Mark Ito, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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