<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Nathan<div class=""><br class=""></div><div class="">We had a much better description of MC efficiency dependence on the beam current in the past. Nick was testing the algorithm for inclusive electron MC and was very close to the expectations from data, within a couple of %. The version on OSG is different from what we used during TF work and significantly underestimates efficiency drop.</div><div class=""><br class=""></div><div class="">Regards, Stepan </div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Dec 22, 2022, at 3:31 PM, Nathan Baltzell via Clas12_dileptons <<a href="mailto:clas12_dileptons@jlab.org" class="">clas12_dileptons@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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Hi Pierre,
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<div class="">Yes, nice presentation!
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<div class="">Regarding questions on CLAS12 background merging ...</div>
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<div class="">My understand is that it currently does two things: adds background hits and accounts for a<font class=""><span style="caret-color: rgb(0, 0, 0);" class=""> holdoff time (rejecting hits that are too close in time to a previous
hit on the same channel). I know we thought the holdoffs were modeled well for DC, because that's where the holdoffs were presumed to be most important, but I'm not sure about all the other detectors.</span></font></div>
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<div class="">But one thing I know it doesn't do is account for time evolution in digitization (and the same goes for GEMC and its internal background). If multiple hits would have merged in hardware, that is not addressed properly but left interpreted as
two separate hits. Maybe/probably that's not too important for detectors that don't use energy deposition offline and/or have a large holdoff time, like DC, but it would get more important at higher rates/luminosity.</div>
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<div class="">-Nathan<br class="">
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<div class="">On Dec 22, 2022, at 2:13 PM, Valery Kubarovsky via Clas12_dileptons <<a href="mailto:clas12_dileptons@jlab.org" class="">clas12_dileptons@jlab.org</a>> wrote:</div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);" class="">Hi Pierre,</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);" class="">You made a very good presentation today.</span></div>
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<span class="ContentPasted0" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">I think that we can verify the main assumption of Stepan's paper "Studies of background with the scattered electron"
that the efficiency is the product of individual efficiencies of the electrons, positrons and protons;</span></div>
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<span class="ContentPasted0" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">using your MC model. What do you think?</span></div>
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<span class="ContentPasted0" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">You have to use MC with BG merging.</span></div>
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<span class="ContentPasted0" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">Thanks,</span></div>
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<span class="ContentPasted0" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">Valery</span></div>
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<font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Clas12_dileptons <<a href="mailto:clas12_dileptons-bounces@jlab.org" class="">clas12_dileptons-bounces@jlab.org</a>> on behalf
of Rafayel Paremuzyan via Clas12_dileptons <<a href="mailto:clas12_dileptons@jlab.org" class="">clas12_dileptons@jlab.org</a>><br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>Monday, December 19, 2022 16:51<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span><a href="mailto:Clas12_dileptons@jlab.org" class="">Clas12_dileptons@jlab.org</a><span class="Apple-converted-space"> </span><<a href="mailto:clas12_dileptons@jlab.org" class="">clas12_dileptons@jlab.org</a>><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>[Clas12_dileptons] Meeting tomorrow</font>
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<div class="x_elementToProof"><span class="x_ContentPasted0" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);">Dear all,</span></div>
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<div class="x_ContentPasted0">let's meet tomorrow.</div>
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<div class="x_ContentPasted0">Please put your material at the link below.</div>
<div class="x_ContentPasted1 x_ContentPasted0"><a href="https://clasweb.jlab.org/rungroups/tlc/wiki/index.php/Meet_December_20_22" id="LPlnk948277" class="">https://clasweb.jlab.org/rungroups/tlc/wiki/index.php/Meet_December_20_22</a></div>
<div class="x_ContentPasted0">The meeting room at JLab is F-228.</div>
<div class="x_ContentPasted0">Meeting link is :</div>
<div class="x_ContentPasted0"><a href="https://jlab-org.zoomgov.com/j/1617534470?pwd=UkR3RlZOSVk3V1RQY2JnMUdIM3RMUT09" class="">https://jlab-org.zoomgov.com/j/1617534470?pwd=UkR3RlZOSVk3V1RQY2JnMUdIM3RMUT09</a></div>
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<div class="x_ContentPasted0">Meetng ID 161 753 4470</div>
<div class="x_ContentPasted0">passcode is 2022</div>
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Rafo<br class="">
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