<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Aptos;
panose-1:2 11 0 4 2 2 2 2 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:12.0pt;
font-family:"Aptos",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
mso-ligatures:none;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I have spoken with Erik and we are making a plan to look at this. I am largely focused on background studies at the moment, but a lot of the code that I have written overlaps with what Erik needs to do this
study. We will coordinate on this soon. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I suspect that covering the first layer will be quite detrimental to X17 due to the forward peaking of the cross section and the added forward boost of running at 4.4 GeV. Preliminary numbers have suggested
that 2.2 GeV is not ideal due to increased frequency of losing the recoil electron to high angles, but I haven’t yet determined whether this is then mitigated by the decreased background. I’ll keep on it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Regarding the third option of reversing the run order, I briefly ran it by Doug this morning. It seems that it’s not completely off the table, but it is not tremendously likely due to requirements and desires
of other halls.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">A question: What is the reason for looking at 150 nA for 4.4 GeV? I don’t recall this discussion (though it may have happened during the Friday meeting after the collaboration meeting when I was unable to
attend). I suppose it is worth considering, however given that we were discussing that the rate may be difficult to deal with during the collaboration meeting, we may find that going up to 150 nA is difficult since the background rates will be higher at 4.4
GeV. From playing with MadGraph5, the integrated xs for BH is ~33% higher at 4.4 GeV though I haven’t taken acceptance into account yet.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Tyler<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div id="mail-editor-reference-message-container">
<div>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">PRad <prad-bounces@jlab.org> on behalf of Weizhi Xiong via PRad <prad@jlab.org><br>
<b>Date: </b>Monday, December 2, 2024 at 10:48</span><span style="font-family:"Arial",sans-serif;color:black"> </span><span style="color:black">PM<br>
<b>To: </b>prad@jlab.org <prad@jlab.org><br>
<b>Subject: </b>[PRad] [EXTERNAL] Re: PRad-II/X17 simulation meeting Dec. 2nd<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black">Dear all,<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black"> For those of you who have trouble attending the meeting today, if you wish, please take a look at the minutes and slides that I recorded here:<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black"> </span><a href="https://wiki.jlab.org/pcrewiki/index.php/PRad-II/X17_Software_Meetings#Dec_2">PRad-II/X17 Software Meetings - Pcrewiki</a><span style="color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black">Weizhi<o:p></o:p></span></p>
</div>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="1" width="100%" align="center">
</div>
<div id="divRplyFwdMsg">
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> PRad <prad-bounces@jlab.org> on behalf of Weizhi Xiong via PRad
<prad@jlab.org><br>
<b>Sent:</b> Monday, December 2, 2024 9:03 AM<br>
<b>To:</b> prad@jlab.org <prad@jlab.org><br>
<b>Subject:</b> [PRad] [EXTERNAL] PRad-II/X17 simulation meeting Dec. 2nd</span> </p>
<div>
<p class="MsoNormal"> </p>
</div>
</div>
<div>
<p class="MsoNormal" style="background:white"><span style="color:black">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black"> We will have a simulation meeting on Monday at 8 PM EST Dec. 2nd. <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black">Weizhi Xiong is inviting you to a scheduled ZoomGov meeting.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black">Join ZoomGov Meeting<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_16163386292-3Fpwd-3DM282RW0wSXVqMjYwczl5WlY2SXpzdz09&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=V3XNY-MaMKN2LuAaTdObrA&m=I5Nh1THHUX7zYa3JLEXLXza8RQZ_LPGiBnW4z6P7jLrXBumh7P7NcJlU1cncHciN&s=NXPzbJt_GyLRmfD30djcftoShvKpTKQp87MZlUElOws&e=" target="_blank">https://jlab-org.zoomgov.com/j/16163386292?pwd=M282RW0wSXVqMjYwczl5WlY2SXpzdz09</a></span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black">Meeting ID: 161 6338 6292<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black">Passcode: 921642 <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black">Weizhi<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>