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<p>Please find the minutes below and at <a class="moz-txt-link-freetext" href="https://goo.gl/0IHkB3">https://goo.gl/0IHkB3</a> .</p>
<p>_______________________</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Start Counter Meeting, July 14, 2016, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
<div id="bodyContent" class="mw-body-content">
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<p>Present:
</p>
<ul>
<li> <b>FIU</b>: Mahmoud Kamel, Werner Boeglin</li>
<li> <b>JLab</b>: Eugene Chudakov, Mark Ito (chair),
Paul Mattione, Simon Taylor</li>
<li> <b>NU</b>: Sean Dobbs</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/9_oi/">recording of this
meeting</a> on the BlueJeans site.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_last_meeting">Review of
minutes from the last meeting</span></h3>
<p>We skimmed through the <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_30,_2016#Minutes"
title="GlueX Start Counter Meeting, June 30, 2016">minutes
from the meeting on June 30</a>. We noted that we have
not taken any action on monitoring the dark current of
the SiPMs and that the mcsmear parameters for the start
counter are still in need of review.
</p>
<h3><span class="mw-headline" id="Update_on_Efficiencies">Update
on Efficiencies</span></h3>
<p>Mahmoud presented a <a rel="nofollow" class="external
text"
href="https://halldweb.jlab.org/talks/2016/SC_meeting_July14_2016.pdf">new
set of slides on efficiencies</a>. This was a
follow-on to the <a rel="nofollow" class="external
text"
href="http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=3078">presentation
he gave Tuesday</a> at the Analysis Meeting. Since
then he has been consulting with Paul on the
interpretation of the ROOT tree produced by the start
counter efficiency plugin.
</p>
<p>Here are the titles of the slides and titles of the
plots in each slide presented today:
</p>
<ul>
<li> 1: Start Counter Efficiency [title page]</li>
<li> 2: Data [run used]</li>
<li> 3: Run: 10492, All Tracks
<ul>
<li> Phi vs TrackHitDeltaPhi</li>
<li> Sector vs TrackHitDeltaPhi</li>
</ul>
</li>
<li> 4: Run: 10492, SC_Eff_Phi for all tracks
<ul>
<li> ProjectedSCHitPhi</li>
<li> ProjectSCHitPhi_Matched</li>
<li> SC_Eff_Phi</li>
</ul>
</li>
<li> 5: Run: 10492, SC_Eff_Sector for all tracks
<ul>
<li> ProjectedSCHitSector</li>
<li> SCHitSector_Matched</li>
<li> SC_Eff</li>
<li> SCHitPhi vs SCHitZ</li>
</ul>
</li>
<li> 6: Run: 10492, Track direction, Z of SC track
intersection and Vertex
<ul>
<li> TrackP3_Theta</li>
<li> Theta vs HitZ</li>
<li> Theta vs HitZ</li>
<li> Theta vs VertexZ</li>
</ul>
</li>
<li> 7: Run: 10492, SC_Eff_Phi for ±6 degrees Δφ Cut
<ul>
<li> ProjectedSCHitPhi</li>
<li> ProjectedSCHitPhi_Matched</li>
<li> SC_Eff_Phi</li>
</ul>
</li>
<li> 8: Run: 10492, SC_Eff_Sector for ±6 degrees Δφ Cut
<ul>
<li> ProjectedSCHitSector</li>
<li> SCHitSector_Matched</li>
<li> SC_Eff</li>
<li> SCHitPhi vs SCHitZ</li>
</ul>
</li>
<li> 9: Run: 10492, SC_Eff_Phi for ±9 degrees Δφ Cut
<ul>
<li> ProjectedSCHitPhi</li>
<li> ProjectedSCHitPhi_Matches</li>
<li> SC_Eff_Phi</li>
</ul>
</li>
<li> 10: Run: 10492, SC_Eff_Sector for ±9 degrees Δφ Cut
<ul>
<li> ProjectedSCHitSector</li>
<li> SCHitSector_Matched</li>
<li> SC_Eff</li>
<li> SCHitPhi vs SCHitZ</li>
</ul>
</li>
<li> 11: Run: 10492, SC_Eff_Phi for ±12 degrees Δφ Cut
<ul>
<li> ProjectedSCHitPhi</li>
<li> ProjectedSCHitPhi_Matches</li>
<li> SC_Eff_Phi</li>
</ul>
</li>
<li> 12: Run: 10492, SC_Eff_Sector for ±12 degrees Δφ
Cut
<ul>
<li> ProjectedSCHitSector</li>
<li> SCHitSector_Matched</li>
<li> SC_Eff</li>
<li> SCHitPhi vs SCHitZ</li>
</ul>
</li>
<li> 13: Run: 10492, All Tracks, 60 bins in Phi
<ul>
<li> Phi vs TrackHitDeltaPhi</li>
<li> Sector vs TrackHitDeltaPhi</li>
</ul>
</li>
<li> 14: Run: 10492, SC_Eff_Phi for all tracks 60 bins
<ul>
<li> ProjectedSCHitPhi</li>
<li> ProjecteSCHitPhi_Matched</li>
<li> SC_Eff_Phi</li>
</ul>
</li>
</ul>
<p>We had a detailed discussion of the meaning of the
variables and implications of the plots. The secretary
will not attempt to transmit all of it. Please see the
recording (linked above) if interested.
</p>
<p>In the end, we concluded that the efficiency shown in
slide 5, overall 97.4%, was a reasonable starting point
for the efficiency calculation. Matching between charged
tracks and start counter hits was done as in the
standard reconstruction where the geometric cuts are
generous. Still missing is the effect of accidental hits
that may contribute to an artificial enhancement of the
naively measured efficiency.
</p>
<h3><span class="mw-headline" id="NIM.2FTDR">NIM/TDR</span></h3>
<p>Eric has been busy with time-critical tasks in Hall C.
That said, document production is on his radar.
</p>
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<div class="moz-cite-prefix">On 07/13/2016 12:31 PM, Mark Ito wrote:<br>
</div>
<blockquote cite="mid:72cdd12c-9796-4759-3c6e-68b719cbdd7e@jlab.org"
type="cite">
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<p>Folks,</p>
<p>Let's have another meeting to quickly go over efficiencies, at
least. Find the meeting page below and at <a
moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://goo.gl/BwevZV"><a class="moz-txt-link-freetext" href="https://goo.gl/BwevZV">https://goo.gl/BwevZV</a></a> .</p>
<p> -- Mark</p>
<p>___________</p>
<p> </p>
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<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Start Counter Meeting, July 14, 2016</span></h1>
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<div id="siteSub">From GlueXWiki</div>
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lang="en">
<p>GlueX Start Counter Meeting<br>
Thursday, July 14, 2016<br>
10:00 am EDT<br>
CEBAF Center, Room F326/327 </p>
<div id="toc" class="toc">
<div id="toctitle">
<h2>Contents</h2>
</div>
<ul>
<li class="toclevel-1 tocsection-1"><a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php?title=GlueX_Start_Counter_Meeting,_July_14,_2016&printable=yes#Agenda"><span
class="tocnumber">1</span> <span
class="toctext">Agenda</span></a></li>
<li class="toclevel-1 tocsection-2"><a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php?title=GlueX_Start_Counter_Meeting,_July_14,_2016&printable=yes#Communication"><span
class="tocnumber">2</span> <span
class="toctext">Communication</span></a>
<ul>
<li class="toclevel-2 tocsection-3"><a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php?title=GlueX_Start_Counter_Meeting,_July_14,_2016&printable=yes#BlueJeans"><span
class="tocnumber">2.1</span> <span
class="toctext">BlueJeans</span></a></li>
<li class="toclevel-2 tocsection-4"><a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php?title=GlueX_Start_Counter_Meeting,_July_14,_2016&printable=yes#Slides"><span
class="tocnumber">2.2</span> <span
class="toctext">Slides</span></a></li>
</ul>
</li>
</ul>
</div>
<h2><span class="mw-headline" id="Agenda">Agenda</span></h2>
<ol>
<li> Announcements</li>
<li> Review <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_30,_2016#Minutes"
title="GlueX Start Counter Meeting, June 30, 2016">minutes
from the last meeting</a></li>
<li> Calibration/Efficiency Update</li>
<li> NIM/TDR</li>
<li> Action Item Review</li>
</ol>
<h2><span class="mw-headline" id="Communication">Communication</span></h2>
<h3><span class="mw-headline" id="BlueJeans">BlueJeans</span></h3>
<ul>
<li> The BlueJeans Meeting ID is 556 286 544 .</li>
<li> <a moz-do-not-send="true" rel="nofollow"
class="external text"
href="https://bluejeans.com/556286544">Connect to
the Meeting</a></li>
</ul>
<h3><span class="mw-headline" id="Slides">Slides</span></h3>
<p>Talks can be deposited in the directory <code>/group/halld/www/halldweb/html/talks/2016</code>
on the JLab CUE. This directory is accessible from the
web at <a moz-do-not-send="true" rel="nofollow"
class="external free"
href="https://halldweb.jlab.org/talks/2016/">https://halldweb.jlab.org/talks/2016/</a>
. </p>
</div>
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