<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Derek,<div><br></div><div>Thanks for the comments!<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On 2 Dec 2024, at 14:57, Derek Glazier <Derek.Glazier@glasgow.ac.uk> wrote:</div><br class="Apple-interchange-newline"><div><meta charset="UTF-8"><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">Hi Peter,</div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"> Slide 5, Advantage of lower energies, "double statistics with 3 weeks of running" , Not clear what it is doubling from. Also the plot with result projections does not correspond to the lower energy results, are you planning to update this ?</div></div></blockquote><div>It is double to what was originally projected. This doubling comes from an older estimation. I think Mark’s initial presentation will clarify if that really is the case as rates might be different. We will see.</div><div><br></div><br><blockquote type="cite"><div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"> On the toy slides I would make clear what the generated value of alpha was.</div></div></blockquote><div>Yes thanks. For everyones benefit: 0.75</div><br><blockquote type="cite"><div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"> The statement about the reduced linear polarisation bias is not really made from these toys. The proposal extraction is within 1 sigma of the generated value, while the new value is just over, all be it with much reduced statistical uncertainty. This really needs fits with free linear polarisation. I think the main conclusion of the exercise is the sensitivity to alpha is greatly increased with the lower energy amplitudes.</div></div></blockquote><div>Maybe. In the proposal we saw that a 1sigma lin pol bias caused a shift from 0.78+-0.08 to 0.71+-0.06 (mean and std of alpha values). In the case of low energies the two numbers are 0.75+-0.02 and 0.73+-0.02. So while both are within one standard deviation of the generated value, the uncertainty is much better and the absolute difference is smaller. I am currently also running a 2sigma and 3sigma bias study to clarify the situation further. As well as a study where linear polarisation is left free in a 2sigma bias case. That all being said, I don’t want to put too much information into this presentation. It might get slightly confusing. We can discuss this all further in our alpha minus meeting.</div><div><br></div><div>Cheers,</div><div>Peter</div><div><br></div><div><br></div><div><br></div><br><blockquote type="cite"><div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">Cheers</div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">Derek</div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><br></div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><br></div><div id="Signature" class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="font-size: 10pt;">.<br></div></div><div id="appendonsend" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"></div><hr tabindex="-1" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline-block; width: 828.09375px;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;"></span><div id="divRplyFwdMsg" dir="ltr" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><font face="Calibri, sans-serif" style="font-size: 11pt;"><b>From:</b><span class="Apple-converted-space"> </span>Halld-alpha <halld-alpha-bounces@jlab.org> on behalf of Peter Pauli <ppauli@jlab.org><br><b>Sent:</b><span class="Apple-converted-space"> </span>02 December 2024 14:22<br><b>To:</b><span class="Apple-converted-space"> </span>halld-alpha@jlab.org <halld-alpha@jlab.org><br><b>Subject:</b><span class="Apple-converted-space"> </span>[Halld-alpha] Slides for meeting tomorrow</font><div> </div></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div class="x_BodyFragment"><font size="2"><span style="font-size: 11pt;"><div class="x_PlainText">Hi all,<br><br>As we discussed in our last meeting there will be a special Physics WG meeting tomorrow to focus on proposals for low energy running.<br><br>I produced a few preliminary studies to show how helpful it can be to our measurement. The short answer: it looks like it could be extremely helpful.<br><br>Attached are the slides I intend to show tomorrow. There will be some changes as I am still running more fits in different configurations but the main takeaway will not change much.<br>I will also add a little bit more text to the result slides to make them easier to understand for people who cannot attend but will look at slides later on. That being said I wanted to send these out to you before I show them and there is not much time left until the meeting. So here is the current state...<br><br>Let me know if you want me to make any changes.<br><br>Cheers,<br>Peter<br><br><br></div></span></font></div><div class="x_BodyFragment"><font size="2"><span style="font-size: 11pt;"><div class="x_PlainText"><br><br><br></div></span></font></div><div class="x_BodyFragment"><font size="2"><span style="font-size: 11pt;"><div class="x_PlainText">_______________________________________________<br>Halld-alpha mailing list<br>Halld-alpha@jlab.org<br><a href="https://mailman.jlab.org/mailman/listinfo/halld-alpha" originalsrc="https://mailman.jlab.org/mailman/listinfo/halld-alpha" shash="Mir5WPfkhELOtAeLzTkKHKvPPCyEgdpi+fDEmaUyFE2vWqDpoQbSVZtxz8E29gw9V2I7WfrtJEoumY/gIDckCActL6p6v7k2bx2fGUQUEM2vUlTetmCGi324+Jkl2Zjj0tdwyaeSH3ZTx5yCvuOl3VpySVqm0zK6UAybiLx+6Co=">https://mailman.jlab.org/mailman/listinfo/halld-alpha</a></div></span></font></div></div></div></blockquote></div><br></div></body></html>