[Clas12_verystrange] [EXTERNAL] Re: FW: Preoparation for RGA jeopardy

[Igor Strakovsky]

Dear VeryStrangers,

Eugene gave us a good hint how EPR may help to look for missing resonances
vs PR.
See attached recent paper by Viktor and coworkers. In fact, non-resonance
background
has a strong Q2 dependence which is vanishing at high Q2. Let me add some
Viktor's
comments

Cheers, igor
=========================================================

Hi Igor',

Here it is.

Answer to your question is in Fig.  1. N'(1720)3/2^+ is the only recently
observed new baryon state for which the information on resonance
electroexcitation amplitudes has become available for the first time..
Therefore, we have insight into the state structure and with help of
theorists can try to understand why ``missing" baryon states escape
detection for a long time.

Good independent check for the state's existence is the studies
piN--->pipiN with J-PARC.

   Best Regards,
                                 Victor


-----
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, igor at jlab.org


On Sun, May 17, 2020 at 7:28 PM Eugene Pasyuk <pasyuk at jlab.org> wrote:

> We should discuss this at our Tuesday meeting. Please attend and come with
> ideas.
>
>
>
> -Eugene
>
>
>
> *From:* Marco Battaglieri <battagli at jlab.org>
> *Sent:* Sunday, May 17, 2020 19:07
> *To:* Raffaella De Vita <devita at jlab.org>; Daniel Watts <
> daniel.watts at york.ac.uk>; derek glazier <dglazier at ph.ed.ac.uk>; Lei Guo <
> lguo at jlab.org>; nicholas <nicholas at jlab.org>; Eugene Pasyuk <
> pasyuk at jlab.org>
> *Cc:* Adam Szczepaniak <aszczepa at jlab.org>; Igor Strakovsky <igor at gwu.edu>
> *Subject:* Preoparation for RGA jeopardy
>
>
>
> Dear colleagues,
>
> as you know RGA will defend the unscheduled time in the jeopardy process
> at the next PAC in August.
>
> I’m assembling two pages related to MesonEx-related  experiments
> (E12-11-005 and E12-11-005A) in CLAS12 to be included in the 10pg document
> RGA will provide to the PAC48 committee.
>
> Following the spirit of the jeopardy process (as far as I understood it!)
> we should provide:
>
> - an assessment of the physics case after ~10y from the proposal
>
> - justification for keep allocated the other 50% of data taking
>
> - preliminary results (on the 50% of data already collected)
>
> - any change/needs in scheduling wrt what has already been allocated
>
>
>
> So far MesonEx (as part of RGA), over the 119 allocated PAC days used ~50%
> of the time.
>
> Requested:
>
> - 80 days: production, high L (1E135)
>
> - 15 days FT commissioning
>
> - 24 days: low L (5x10E33) for calibration and trigger tests
>
> Not fully clear to me how to consider the 15+24 ‘special’ days allocated
> but before to make any fuzz we should understand if we need any low L data
> ..
>
>
>
> I’d start from considering that we need to justify a remaining 50% of data
> taking at high Lumi (standard RGA production time).
>
>
>
> Two pages are not difficult to write on the subject but before to start
> I’d like to have from all of you a 1/2-1pg list (bullets) of items that we
> should report in the document.
>
> I included Adam and Igor in this request because they should be able to to
> provide a quick  feedback in particular on progress on amplitude analysis
> worldwide and specifically at JPAC(Adam) and very strange spectroscopy
> (Igor).
>
> Here are the of topics (not only but  at least) that you are expected to
> cover in your 1/2-1pg list:
>
> - Physics motivation: what’s new from theory side (Adam, Igor) and
> experimental (Raffaella, Lei, Dan)  after 10y from the proposal
>
> - preliminary results from RGA: (Raffaella, Derek, Nick and Eugene)
>
> - justification for the remaining 50% (all)
>
> - specific requests for the next run conditions? (all)
>
>
>
> If you could send me your thoughts (not necessary to be fully elaborated,
> just ideas, reference, and cues ..) in two-three days (by *Wednesday
> May20*), I’ll put together and circulate the document by the end of the
> week for your final review.
>
> Thanks in advance
>
> Marco
>
>
>
> ps I did not include all active members of the two experiments simply to
> keep the number of involved people limited. As soon as the document will be
> drafted, all spokespersons will be contacted.
>
>
> _______________________________________________
> Clas12_verystrange mailing list
> Clas12_verystrange at jlab.org
> https://mailman.jlab.org/mailman/listinfo/clas12_verystrange
>
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