[Halld-physics] Physics Working Group Meeting: Tuesday, October 16 @ 11:15 am

[Justin Stevens]

Hi Igor,

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.

-Justin

> On Oct 15, 2018, at 3:11 PM, Igor Strakovsky <igor at gwu.edu> wrote:
> 
> Hi Justin,
> 
> It would be good to spell out a possible Eg range and our goals for summer of 2019.  Then all depends.  
> 
> I reported twice that if our range is limited by 4 - 6 GeV and our main goal is diff cross sections then 
> g12 from CLAS6 will work for us.  There are no CLAS pol measurements in this case.  So, we have 
> gp-->pi0p cross sections published several month ago and Volker's analyses for gp-->etap and 
> gp-->omegap are under the HW group review now.
> 
> If one can possible to go below 3 GeV then we will have more options including polarized 
> measurements. Additional benefit will come from the ability to use the PWA technology to evaluate
> new data and possibility to provide "good" event generators for MC.  See my slides at DB
> 
> Cheers, igor
> 
> 
> 
> -----
> Igor Strakovsky, SAID INS The George Washington University
> Tel: 571-553-8344(VC),202-994-4742(FB),Skype: igors1945_2, 
> Cell: 703-728-5627,Emails: igor at gwu.edu <mailto:igor at gwu.edu>, igor at jlab.org <mailto:igor at jlab.org>
> 
> On Mon, Oct 15, 2018 at 12:50 PM Justin Stevens <jrsteven at jlab.org <mailto:jrsteven at jlab.org>> wrote:
> Hi All,
> 
> 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.  
> 
> 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 https://halldweb.jlab.org/wiki-private/index.php/Aug_7,_2018,_Physics_Working_Group <https://halldweb.jlab.org/wiki-private/index.php/Aug_7,_2018,_Physics_Working_Group>).
> 
> If you have something you would like to contribute to the discussion, please let me know.
> 
> -Justin
> 
>> On Oct 14, 2018, at 1:46 PM, Justin Stevens <jrsteven at jlab.org <mailto:jrsteven at jlab.org>> wrote:
>> 
>> Hi All,
>> 
>> Our next Physics WG meeting we be Tuesday, October 16 at 11:15 am, https://halldweb.jlab.org/wiki-private/index.php/Oct_16,_2018,_Physics_Working_Group <https://halldweb.jlab.org/wiki-private/index.php/Oct_16,_2018,_Physics_Working_Group>.  Please let me know if you have something you would like to present.
>> 
>> -Justin
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