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<p>Folks,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_January_11,_2022#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p> __________________________________</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, January 11, 2022, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present: Alex Austregesilo, Sean Dobbs, Mark Ito
(chair), Igal Jaegle, Simon Taylor, Beni Zihlmann
</p>
<p>There is a <a rel="nofollow" class="external text"
href="https://jlab-org.zoomgov.com/rec/share/V97EEHpdU82C0J1rpmZQ44NAqvU-uRUN1FIFTtKt7T6hZDgHInTCiD5yVg414-X-.062c2aUbVDmZKoKh">recording
of this meeting</a> (Passcode: a5$amBYh) on the
ZoomGov 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 went over the <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_November_29,_2021#Minutes"
title="HDGeant4 Meeting, November 29, 2021">minutes
from the meeting on November 29th</a>.
</p>
<ul>
<li> We have not had further word on the reports of
disagreement between data and MC for timing signals
timing signals from the FCAL.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/196">Data/MC
discrepancy in FCal Matching around Beam Hole</a>.
We went over this issue nearly from beginning to end
to refresh our collective memories. Sean is planning
to look at an event sample from Rebecca Barsotti with
exclusive ω events for hits in the FCAL (a) near the
beam hole and (b) not from the detected proton or
particles from ω decay. These may be different than
the real data events Alex shows in the issue.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/195">Crash
adding daughters on RHEL/CentOS 8</a>. Hao Li closed
this issue.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/191">Add
incident angle dependence to DIRC mirror
reflectivity</a>. No new news on this one.</li>
</ul>
<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>There were no new issues other than the ones noted
above.
</p>
<p>Sean mentioned an emerging issue with timing for CPP.
Sean asked Elton Smith for a sample of signal Monte
Carlo (&mu pairs were provided) to work out the
timing calibration procedure without use of the start
counter. Some development was needed to get everything
working. And yet, after calibration constants are
applied, the vast majority of events show a 4 ns offset
from the correct RF time. He is waiting for feedback
from Elton and Simon, but this may show up as an issue
in the future.
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