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Thank you Matt for the explanation and slides. Looking at pi0, not only in the fiducial volume (~20 cm < r < ~100 cm), but outside of it, is probably exposing cracks in the current simulation scheme. Unfortunately, we need the inner rings<br>
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tks ig. <br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Shepherd, Matthew <mashephe@indiana.edu><br>
<b>Sent:</b> Monday, April 27, 2020 5:54 AM<br>
<b>To:</b> Drew Smith <andrew.p.smith@duke.edu>; Igal Jaegle <ijaegle@jlab.org><br>
<b>Cc:</b> primexd@jlab.org <primexd@jlab.org><br>
<b>Subject:</b> Re: [Primexd] [EXTERNAL] PrimEx Meeting Friday, April 24 at 1PM EDT</font>
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<div class="">Drew and Igal,</div>
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<div>I was looking through your slides and also there is the thread of Igal's comments about hit level gains. I see Drew noticed some G3/G4 differences in number of hits. Which one is "right" depends on data.</div>
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<div>As I noted to Igal, this was studied and tuned in G4. It is particularly important to get low-energy response correct when writing the algorithm to reject hadron interactions.</div>
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<div>See slide 9 of this:</div>
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<div><a href="https://halldweb.jlab.org/DocDB/0040/004084/001/MC_NeuralNet_Updates.pdf" class="">https://halldweb.jlab.org/DocDB/0040/004084/001/MC_NeuralNet_Updates.pdf</a></div>
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<div>Also the checking of energy response in G4 is illustrated on slide 14 of that same talk. You can see the reconstruction of the photon gun works just fine. This suggests a discrepancy between Igal's plots and these photon gun results, perhaps somehow
related to the use of a pi0? ...or something has changed.</div>
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<div>Matt</div>
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<div class="">On Apr 23, 2020, at 7:25 PM, Drew Smith <<a href="mailto:andrew.p.smith@duke.edu" class="">andrew.p.smith@duke.edu</a>> wrote:</div>
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Dear All,</div>
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The next PrimEx meeting will be tomorrow, April 24, 2020 at 1 PM (EDT). Here is a link to the meeting page, please add to the agenda if you have any updates:</div>
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<a href="https://halldweb.jlab.org/wiki-private/index.php/April_24,_2020_PrimEx-Eta_Meeting" id="LPlnk781083" class="">https://halldweb.jlab.org/wiki-private/index.php/April_24,_2020_PrimEx-Eta_Meeting</a><br class="">
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Here is a link to the bluejeans meeting page:</div>
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<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab.bluejeans.com_7572695553_&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=lU05Rh9aCuulfMNDTEUwlg&m=2mdSf37sXaUkuO5zaQ0H5-oYP2gQZRhMv7575tlmmOA&s=ZkRSLDXTBkghWzZmC9BynODrAystctRBSVCaBKby434&e=" target="_blank" rel="noopener noreferrer" class="" style="margin:0px">https://jlab.bluejeans.com/7572695553/</a><br class="">
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Best,</div>
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-- Drew</div>
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