<div dir="ltr"><div>Sure, Sean, I know that</div><div><br></div><div>There is a perfect agreement between g12 by Kunkel and g1c by Dugger in the case of overlap.</div><div>Specifically that Dugger (sorry, they both Mikes) made his analysis to select outcoming proton </div><div>while Kunkel selected e+e- from pi0 decay</div><div><br></div><div>Cheers, igor</div><div><br></div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>-----</div><div>Igor Strakovsky, SAID INS The George Washington University</div><div>Tel: 571-553-8344(VC),202-994-4742(FB),Skype: igors1945_2, </div><div><span style="font-size:12.8px">Cell: 703-728-5627,</span><span style="font-size:12.8px">Emails: </span><a href="mailto:igor@gwu.edu" style="font-size:12.8px" target="_blank">igor@gwu.edu</a><span style="font-size:12.8px">, </span><a href="mailto:igor@jlab.org" style="font-size:12.8px" target="_blank">igor@jlab.org</a></div></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Oct 23, 2018 at 2:43 PM Sean Dobbs <<a href="mailto:sdobbs@fsu.edu">sdobbs@fsu.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div>
<div dir="auto">Hi Igor,</div>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">Just one more comment, I made these estimates with comparing to CLAS measurements (including the data you sent me) in mind. </div>
<div dir="auto"><br>
</div>
<div dir="auto">Cheers</div>
<div dir="auto">Sean</div>
<div><br>
<div class="gmail_quote">
<div dir="ltr">On Tue, Oct 23, 2018 at 3:22 AM Igor Strakovsky <<a href="mailto:igor@gwu.edu" target="_blank">igor@gwu.edu</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>Hi Justin,</div>
<div><br>
</div>
<div>Plan looks great. I have two small comments</div>
<div><br>
</div>
<div>- The min Eg is still unclear. So, if one can possible to go a little bit below 3 GeV then CLAS</div>
<div>g1c data for pi0 is reachable [DUGGER, PRC76, 025211(2007)]: Eg = 2875, 2825, 2775 and so on</div>
<div><br>
</div>
<div>- I would not use <span style="color:rgb(37,37,37);font-family:sans-serif;font-size:14px"> </span><a rel="nofollow" class="m_-6539583032683423116m_3252595180729273346external m_-6539583032683423116m_3252595180729273346gmail-text" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__halldweb.jlab.org_DocDB_0008_000809_002_GlueX-5Fdoc-5F809.pdf&d=DwMFaQ&c=HPMtquzZjKY31rtkyGRFnQ&r=bxTPW7N21WY8eJ2MkW85CQ&m=1O1CO8HBnkAzX_0rBMir1hYatCH9geOY0aILsSyuhEo&s=jOyUpUcxA4ygMm4nUGJcQB4JT4TC-2jTVaMFmt2YlZ8&e=" style="color:rgb(102,51,102);padding-right:13px;font-family:sans-serif;font-size:14px" target="_blank">previous
measuremen</a>as the source to compare with because most of data</div>
<div>came from brem Bonn measurements which systematics is out the control.</div>
<div><br>
</div>
<div>Cheers, igor</div>
<br clear="all">
<div>
<div dir="ltr" class="m_-6539583032683423116m_3252595180729273346gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>-----</div>
<div>Igor Strakovsky, SAID INS The George Washington University</div>
<div>Tel: 571-553-8344(VC),202-994-4742(FB),Skype: igors1945_2, </div>
<div><span style="font-size:12.8px">Cell: 703-728-5627,</span><span style="font-size:12.8px">Emails:
</span><a href="mailto:igor@gwu.edu" style="font-size:12.8px" target="_blank">igor@gwu.edu</a><span style="font-size:12.8px">,
</span><a href="mailto:igor@jlab.org" style="font-size:12.8px" target="_blank">igor@jlab.org</a></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</div>
</div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Tue, Oct 23, 2018 at 7:54 AM Justin Stevens <<a href="mailto:jrsteven@jlab.org" target="_blank">jrsteven@jlab.org</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word;line-break:after-white-space">Hi Igor, All,
<div><br>
</div>
<div>Yes, as we discussed at the Physics WG meeting last week, there are 2 possibilities for low energy measurements which correspond to your bullets below. The priority was given to proposing a run plan for this Fall, since time is limited. Thanks to Sean
for collecting the relevant data and rate estimates for this Fall’s proposal at <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__halldweb.jlab.org_wiki-2Dprivate_index.php_2018-5FLow-5Fenergy-5Fmeasurements&d=DwMFaQ&c=HPMtquzZjKY31rtkyGRFnQ&r=bxTPW7N21WY8eJ2MkW85CQ&m=1O1CO8HBnkAzX_0rBMir1hYatCH9geOY0aILsSyuhEo&s=qKz1F8vW7uaYtr4qsZe3ELkzY4KlLhx9PAsepkinRgA&e=" target="_blank">
https://halldweb.jlab.org/wiki-private/index.php/2018_Low_energy_measurements</a>. The short summary is that we would like to propose a ~5 day run with a lower PS field setting to give statistical errors <10% on cross sections for comparison to previous measurements,
and this is on the agenda for today’s bi-weekly meeting.</div>
<div><br>
</div>
<div>This Fall’s proposal of course does not preclude running in Summer 2019, but would give us some data in the short term to compare with previously measured cross sections. To make a decision on Summer 2019 running, we would need a similar proposal with
the stated goals, rate estimates, and required running time.</div>
<div><br>
</div>
<div>-Justin<br>
<div><br>
<blockquote type="cite">
<div>On Oct 17, 2018, at 4:34 PM, Igor Strakovsky <<a href="mailto:igor@gwu.edu" target="_blank">igor@gwu.edu</a>> wrote:</div>
<br class="m_-6539583032683423116m_3252595180729273346m_4800783550453654789Apple-interchange-newline">
<div>
<div dir="ltr">
<div>
<div dir="ltr" class="m_-6539583032683423116m_3252595180729273346m_4800783550453654789gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>Hi Justin,</div>
<div><br>
</div>
<div>According to my understanding there are two different run periods</div>
<div><br>
</div>
<div>- this fall which will allow to cover 4-9 GeV or so. CLAS6 does not have pol measurements</div>
<div><br>
</div>
<div>- next summer which is a low energy run which you spelled out. that is different story</div>
<div><br>
</div>
<div>Cheers, igor</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Wed, Oct 17, 2018 at 1:15 PM Justin Stevens <<a href="mailto:jrsteven@jlab.org" target="_blank">jrsteven@jlab.org</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word;line-break:after-white-space">Hi Igor,
<div><br>
</div>
<div>Thanks for your feedback. My understanding is the accelerator would run at half energy (Ee ~ 5.5 GeV), and as usual we could choose to set the coherent peak as we prefer. The hodoscope in this case would cover Eg ~ 1.5 GeV to the endpoint, although it
will still be only half instrumented (sampling) between 1.5 and 3.5 GeV. So data below Eg = 4 GeV could be possible in this scenario, but at a lower efficiency.</div>
<div><br>
</div>
<div>-Justin<br>
<div><br>
<blockquote type="cite">
<div>On Oct 15, 2018, at 3:11 PM, Igor Strakovsky <<a href="mailto:igor@gwu.edu" target="_blank">igor@gwu.edu</a>> wrote:</div>
<br class="m_-6539583032683423116m_3252595180729273346m_4800783550453654789m_-965336248231162288Apple-interchange-newline">
<div>
<div dir="ltr">
<div>Hi Justin,</div>
<div><br>
</div>
<div>It would be good to spell out a possible Eg range and our goals for summer of 2019. Then all depends. </div>
<div><br>
</div>
<div>I reported twice that if our range is limited by 4 - 6 GeV and our main goal is diff cross sections then </div>
<div>g12 from CLAS6 will work for us. There are no CLAS pol measurements in this case. So, we have </div>
<div>gp-->pi0p cross sections published several month ago and Volker's analyses for gp-->etap and </div>
<div>gp-->omegap are under the HW group review now.</div>
<div><br>
</div>
<div>If one can possible to go below 3 GeV then we will have more options including polarized
<br>
measurements. Additional benefit will come from the ability to use the PWA technology to evaluate</div>
<div>new data and possibility to provide "good" event generators for MC. See my slides at DB</div>
<div><br>
</div>
<div>Cheers, igor</div>
<div><br>
</div>
<div><br>
</div>
<br clear="all">
<div>
<div dir="ltr" class="m_-6539583032683423116m_3252595180729273346m_4800783550453654789m_-965336248231162288gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>-----</div>
<div>Igor Strakovsky, SAID INS The George Washington University</div>
<div>Tel: 571-553-8344(VC),202-994-4742(FB),Skype: igors1945_2, </div>
<div><span style="font-size:12.8px">Cell: 703-728-5627,</span><span style="font-size:12.8px">Emails:
</span><a href="mailto:igor@gwu.edu" style="font-size:12.8px" target="_blank">igor@gwu.edu</a><span style="font-size:12.8px">,
</span><a href="mailto:igor@jlab.org" style="font-size:12.8px" target="_blank">igor@jlab.org</a></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Mon, Oct 15, 2018 at 12:50 PM Justin Stevens <<a href="mailto:jrsteven@jlab.org" target="_blank">jrsteven@jlab.org</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word;line-break:after-white-space">Hi All,
<div><br>
</div>
<div>There’s been a proposal to have a short discussion about a potential low-energy run in Summer 2019 during tomorrow’s physics meeting. To frame the discussion: the accelerator plans to run at ~half energy during June/July 2018 and GlueX could potentially
run parasitically during this period. </div>
<div><br>
</div>
<div>We had some discussion about the potential usefulness of low-energy running earlier this year (comparison to cross section measurements from CLAS, energy-dependence of polarization observables, etc.), but that was in a different context of using the full
energy electron beam with lower coherent peak settings (see <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__halldweb.jlab.org_wiki-2Dprivate_index.php_Aug-5F7-2C-5F2018-2C-5FPhysics-5FWorking-5FGroup&d=DwMFaQ&c=HPMtquzZjKY31rtkyGRFnQ&r=bxTPW7N21WY8eJ2MkW85CQ&m=1O1CO8HBnkAzX_0rBMir1hYatCH9geOY0aILsSyuhEo&s=k-u9QGAIL1MkAy0QcTRZX7uRIHyi0N_j9auSkJx475M&e=" target="_blank">https://halldweb.jlab.org/wiki-private/index.php/Aug_7,_2018,_Physics_Working_Group</a>).</div>
<div><br>
</div>
<div>If you have something you would like to contribute to the discussion, please let me know.</div>
<div><br>
</div>
<div>-Justin<br>
<div><br>
<blockquote type="cite">
<div>On Oct 14, 2018, at 1:46 PM, Justin Stevens <<a href="mailto:jrsteven@jlab.org" target="_blank">jrsteven@jlab.org</a>> wrote:</div>
<br class="m_-6539583032683423116m_3252595180729273346m_4800783550453654789m_-965336248231162288m_-160429451515303739Apple-interchange-newline">
<div>
<div>Hi All,<br>
<br>
Our next Physics WG meeting we be Tuesday, October 16 at 11:15 am, <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__halldweb.jlab.org_wiki-2Dprivate_index.php_Oct-5F16-2C-5F2018-2C-5FPhysics-5FWorking-5FGroup&d=DwMFaQ&c=HPMtquzZjKY31rtkyGRFnQ&r=bxTPW7N21WY8eJ2MkW85CQ&m=1O1CO8HBnkAzX_0rBMir1hYatCH9geOY0aILsSyuhEo&s=W_9cfqYD3IiiFCrQK_scYgrcuEMuqTKEdbR9Zn2L9vo&e=" target="_blank">
https://halldweb.jlab.org/wiki-private/index.php/Oct_16,_2018,_Physics_Working_Group</a>. Please let me know if you have something you would like to present.<br>
<br>
-Justin<br>
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