<div dir="ltr"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"></div></div></div></div></div></div></div></div>Volker,<div><br></div><div>The cross section of the Omega photoproduction is still unknown. We are looking for the Omega events </div><div>if CLAS12 statistics and resolution will allow to do that. Then all depends what we will have a chance to</div><div>see - events, total, or differential cross sections. Specifically that theory predictions for the total cross </div><div>sections vary in the range of 500. The dynamics is unknown - no strange quarks at the initial state while </div><div>finale state has three strange quarks.</div><div><br></div><div>Cheers, igor</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jun 25, 2019 at 11:51 PM burkert <<a href="mailto:burkert@jlab.org">burkert@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">In my opinion, this abstract on the Omega- is quite premature. It talks <br>
about "we will analyze". What is the point of submitting an abstract <br>
before even a hint of Omega- events is seen in the data? At least I <br>
haven't seen any of it. It is bad practice to submit abstracts based on <br>
unsubstantiated projections that later have to be withdrawn or results <br>
in a no show. We have to show data that have clear impact.<br>
<br>
Volker<br>
<br>
<br>
On 6/25/19 9:23 PM, Isabella Illari wrote:<br>
> Hi Everyone,<br>
><br>
> Due to some discussion/conversation with Justin, Volker and Igor this <br>
> is the updated abstract for the upcoming DNP meeting, appended to the <br>
> bottom. Comments and suggestions are welcome.<br>
><br>
> All the best,<br>
><br>
> Izzy<br>
><br>
> Photoproduction of the Omega- in JLab's Hall B CLAS12<br>
> Isabella Illari1, Olga Cortes Becerra1, William Phelps1<br>
> 1Physics Department, The George Washington University, Washington, <br>
> D.C. 20052<br>
><br>
> The photoproduction of the very strange hyperon, the Omega-, <br>
> cross-section is unknown. The dynamics of the Omega photoproduction is <br>
> unclear – there are no strange quarks in the initial case while three <br>
> quarks are in the final state. There are theoretical predictions for <br>
> the Omega- hyperon photo- and electroproduction that varies from 1 to <br>
> 300 pb, but there is only an upper limit of the cross section (σt < 17 <br>
> nb at 20 GeV) reported by SLAC. In order to measure the cross section <br>
> for γp → Ω−K+K+K0 and to study the reaction mechanism for the Ω− in <br>
> photoproduction we will analyze data from two of the experimental <br>
> halls at Thomas Jefferson National Accelerator Facility. The CLAS12 <br>
> physics program studies baryon spectroscopy with quasi-real <br>
> photoproduction in a large variety of final states, and Run Group A <br>
> experiments require an 11 GeV beam and a liquid hydrogen target. Thus, <br>
> we are aiming to develop a better understanding of the mechanism of <br>
> "Very Strange" hyperon photoproduction, and to obtain accurate <br>
> measurements of a cross section like the Omega- using data from CLAS12.<br>
><br>
> This work was performed with support from US DOE DE-SC001658, The <br>
> George Washington University, and Thomas Jefferson National <br>
> Accelerator Facility.<br>
><br>
<br>
</blockquote></div>