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Folks,<br>
<br>
After the meeting, Peter pointed out to me that we need an action
plan to address the discrepancies he sees with the energy response
of the calorimeter for protons and charged kaons and with the drop
in acceptance he sees in tracking when comparing G4 with G3.<br>
<br>
Ideas? Volunteers?<br>
<p> -- Mark</p>
<div class="moz-cite-prefix">On 4/9/19 5:51 PM, Mark Ito wrote:<br>
</div>
<blockquote type="cite"
cite="mid:172b9a5d-2d64-2a42-0b5b-8e0912d04bb2@jlab.org">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Folks,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_April_9,_2019#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p><><><><><><><><><><><><><><><><><><></p>
<p> </p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting Minutes, April 9, 2019</span></h2>
<div id="bodyContent" class="mw-body-content">
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">
<p>Present: </p>
<ul>
<li> <b>CMU: </b> Naomi Jarvis</li>
<li> <b> Glasgow: </b> Peter Pauli</li>
<li> <b> JLab: </b> Alex Austregesilo, Thomas
Britton, Mark Dalton, Stuart Fegan, Mark Ito
(chair), Simon Taylor, Beni Zihlmann</li>
</ul>
<p>There is <a rel="nofollow" class="external text"
href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbluejeans.com%2Fs%2F5Ft48%2F&data=02%7C01%7Cmarki%40jlab.org%7C5a178cafc4624bfd766208d6bd359549%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636904435172110753&sdata=RhhY1x6lt91rvqefjAlqgfD0tKwF3OEnRH17vBPZJzA%3D&reserved=0"
originalsrc="https://bluejeans.com/s/5Ft48/"
shash="f+bterH5ysYIWS18of63d8XJNO9raG2o8NJSiLtIuLmiN0+OOUmDmcazZ/WeOm/WByq4qZgK8BTA70LEgl3dQHeGRxdL2zfhVChYDfRmPaetcAPl5ogs83CemY1ZXUxcDjyQGdxtbv8tbwh6DhkT4BU8eJ3KV6LCzd2cS0tUl2c="
moz-do-not-send="true">a recording of this meeting</a>
on the <a rel="nofollow" class="external text"
href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjlab.bluejeans.com%2F&data=02%7C01%7Cmarki%40jlab.org%7C5a178cafc4624bfd766208d6bd359549%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636904435172110753&sdata=u2CukvT0SvY4%2FfLbR9Gp%2FCQNFrhGGdXzYy8BpZiuKoc%3D&reserved=0"
originalsrc="https://jlab.bluejeans.com/"
shash="QLBfztFA3JJNxeWtJVaNQtNoHhOTevGQjJGImS2/pQbB4FnIfwEqC4/Vho9hvq+vdEjQ/C+Mie4IpPW7zmE5HtMvHbQD+4A8R/Z3Ly52o8n+VQ5rGpPZVQn/lhOPGOTOPsOBUu4/xpyMqBg2kKad5GIfwf1OSON53EZUwIBJo3s="
moz-do-not-send="true">BlueJeans site</a>. Use your
JLab credentials to access it. </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 <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_March_26,_2019#Minutes"
title="HDGeant4 Meeting, March 26, 2019"
moz-do-not-send="true">the minutes from the March
26th meeting</a> without significant comment. </p>
<h3><span class="mw-headline"
id="Do-over_on_comparison_studies">Do-over on
comparison studies</span></h3>
<p>Simon is working on analysis of his particle gun
simulations. </p>
<h3><span class="mw-headline"
id="Geant3.2F4_comparisons_for_the_K-.2C_K.2B_and_p_particle_gun">Geant3/4
comparisons for the K-, K+ and p particle gun</span></h3>
<p>Peter led us though <a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3964"
moz-do-not-send="true">the set of summary slides</a>
from his particle gun studies. He chose protons and
charged kaons because they are relevant to his
analysis. Further he chose kinematic regions for each
that match his reaction. He created monitoring plots
for each species and had posted the complete set of
plots for each as part of his GlueX Note. </p>
<p>The summary alone runs to 72 slides and we went
through them all in the course of about an hour. The
secretary does not have detailed notes on each slide,
but will record here some general remarks: </p>
<ul>
<li> Peter told us he chose plots that seemed
interesting, either because they showed good
agreement between GEANT and Geant4 or, more likely,
because there were puzzling differences.</li>
<li> As a general guide, if two plots are shown on the
same pad, the blue is GEANT and the red is Geant4.
If there are two separate pads, then the top is
GEANT, the bottom is Geant4.</li>
<li> He sees a charged particle reconstruction
efficiency for Geant4 that is about 10% lower than
that for GEANT. Alex noted that this is similar to
what he is seeing when he studies ρ<sup>0</sup>
events.</li>
<li> Peter mentioned that the differences he picked
out are mostly of two broad classes: (1) energy or
(2) timing, in each case as measured by the
calorimeters.</li>
<li> We noted that since the z-position of charged
particles is not well measured for single particles,
some the the timing distributions may be hard to
understand. Still they should have similar features
in GEANT vs. Geant4.</li>
<li> The versions of the code he used came before <a
rel="nofollow" class="external text"
href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FJeffersonLab%2FHDGeant4%2Fpull%2F100&data=02%7C01%7Cmarki%40jlab.org%7C5a178cafc4624bfd766208d6bd359549%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636904435172120762&sdata=2IdtrhIb%2BqgKQ87bdul4YJVdWKBsAS%2BGMbXoA66UhK8%3D&reserved=0"
originalsrc="https://github.com/JeffersonLab/HDGeant4/pull/100"
shash="NyLWqBpuFGbYw4OtQfzdZUh1QXj3BRurORv2dK1NDEFjZGtwiZjHhbwT2KOu7CEZKu/LCW3vvpqe0cAmzlUdjnt6WeOvFo5dklhGF7vPp/KHPlL94D5RkiIiu93mifxu5s5zJ0GYCdpPJpOU3tgD140MSy56wvRFoNSiwmmsAIE="
moz-do-not-send="true">Richard's most recent pull
request</a>, symmetrizing the treatment of timing
between the FCAL and BCAL. Some of the differences
may have lessened in the new code; this should be
checked.</li>
</ul>
<p>Please consult the recording if interested in a
plot-by-plot discussion. </p>
<h3><span class="mw-headline"
id="Issue_on_GitHub:_missing_thrown_events">Issue on
GitHub: missing thrown events</span></h3>
<p>Thomas called our attention to <a rel="nofollow"
class="external text"
href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FJeffersonLab%2FHDGeant4%2Fissues%2F101&data=02%7C01%7Cmarki%40jlab.org%7C5a178cafc4624bfd766208d6bd359549%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636904435172130770&sdata=Bh7Zeh3vNlUw%2BnciK4g%2FFS7xUSmOliEET%2Bv1vC8ukkE%3D&reserved=0"
originalsrc="https://github.com/JeffersonLab/HDGeant4/issues/101"
shash="xh57GZETvuEs1rIw7fNFJud3TaKkC7HQc0VnYvw9QYIfH4/I6kdpDpzlg+Rmy3movzR+NE9Uvu2DqbhlF4jlzVlBBaWjS1B9kOxWzdkh4WqP/QL/EqIWp9nlsjYlp7ogsg3QF/9qcUOyQI1u9GTyrALKKGdlR/acoIB1hCzH+O0="
moz-do-not-send="true">Issue #101 on GitHub</a>,
"Differences between G3 and G4 in eta.pi," submitted
by Carlos Salgado. Carlos sees a completely different
thrown momentum distribution for protons when using
GEANT vs. Geant4 even though the generated events are
identical in the two cases. Indeed they come from the
same HDDM file. </p>
</div>
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