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

Wed May 20 09:14:28 EDT 2020

Thank you Igor. Your last statement (point 5) should go under point 1, since it motivates the electroproduction measurement.

-N

> On 20 May 2020, at 14:04, Igor Strakovsky <igor at gwu.edu> wrote:
> 
> Hi Lei and Nick,
> 
> Please find your attached doc with my 2c contribution
> 
> Cheers, igor
> 
> On Wed, May 20, 2020 at 7:53 AM nicholas <nicholas at jlab.org <mailto:nicholas at jlab.org>> wrote:
> See attached. Maybe we can put it into a google document?
> 
> -N
> 
> 
>> On 20 May 2020, at 12:42, Lei Guo <leguo at fiu.edu <mailto:leguo at fiu.edu>> wrote:
>> 
>> Hi, Nick,
>> 
>> All sounds good. Do you mind editing it into the document I sent earlier?
>> 
>> Lei
>> 
>>> On May 20, 2020, at 7:22 AM, nicholas <nicholas at jlab.org <mailto:nicholas at jlab.org>> wrote:
>>> 
>>> Note: This message originated from outside the FIU Faculty/Staff email system.
>>> 
>>> 
>>> Hi Lei, 
>>> 
>>> I think we should also point out that the current work on VS has still high impact and that no other new data have emerged since the proposal. 
>>> Maybe we can put a bit more emphasis on eletroproduction and the Q^2 dependence and that the full planned data is needed since electroproduction is associated with smaller cross-sections. Of course there is no other place other than JLab to do this. 
>>> 
>>> I am not 100% convinced on the next run conditions… We have some time and we might need to go back and do a bit more detailed simulations again and see how we could enhance cascade signals (especially related to the torus polarity). This might be tricky though as we would need the full RGA to be onboard.
>>> 
>>> my 2 cents..
>>> -N
>>> 
>>>> On 20 May 2020, at 11:30, Lei Guo <lguo at jlab.org <mailto:lguo at jlab.org>> wrote:
>>>> 
>>>> Hi, All,
>>>> 
>>>> Here is a first thought of what we could provide to Marco for the RGA jeopardy, and I will organize it according to Marco’s request bullets; I also attach it in a word document, so please feel free to edit. I can make them into a proper document/format in the way Marco wants once everyone has the input. 
>>>> <RGA_Jeopardy_VS.docx>
>>>> 
>>>> 1. Physics Motivation (what’s new in addition to what’s stressed in the proposal).
>>>> 1.a. Cascade electroproduction (using electrons in the forward detector instead of FT. We have already seen decent cascade signals from several people in Very Strange. We could provide the plots showing the MM(eK+K+) spectrum. Any results of cascade electroproduction would be new, whether it’s detailed differential cross sections  or simply some total cross sections which should be feasible.
>>>> 1.b The Belle 2018 results (PRL 122, 072501)of “new” cascades using the Xi-pi+ spectra is very interesting. CLAS results in 2007 (PRC76,025208)in similar channel did report the Xi(1530) cross section in similar channel (Xi0jpi-), and there was a bump around 1620 MeV but it was not statistically signifiant. 
>>>> 1.c Excited S=-1 Hyperons: We did mention that in the proposal but not the main part. But it could be a major part of the physics results coming out of Very Strange group.
>>>> 2. Preliminary Results from very strange: 
>>>> We should probably show what we have;
>>>> 2.a eK+pi-p: Lambda signals
>>>> 2.b. MM(eK+K+) using forward detectors. 
>>>> 3. Justification for the remaining 50%: Very Strange would clearly benefit from the remaining 50%. We might end up with OK statistics for ground state cascades or Excited S=-1 hyperons. But excited cascades and Omega would need any more statistics we can get. For existing RGA data using the beam charge of about 250mC, we expect somewhat 300 Xi(1820) (from a recent exercise from Achyut that used updated CLAS12 simulation) using the upper limit of cross section from g12 (PRC98, 062201, Rapid Communication).  Of course that lower beam energy and the cross section was likely much lower. 
>>>> 4. Specific requests for the next run conditions: Fall-2018—later conditions seems to be more optimized, so no changes from that?
>>>> 
>>>> 
>>>> 
>>>>> On May 17, 2020, at 7:27 PM, Eugene Pasyuk <pasyuk at jlab.org <mailto: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 <mailto:battagli at jlab.org>> 
>>>>> Sent: Sunday, May 17, 2020 19:07
>>>>> To: Raffaella De Vita <devita at jlab.org <mailto:devita at jlab.org>>; Daniel Watts <daniel.watts at york.ac.uk <mailto:daniel.watts at york.ac.uk>>; derek glazier <dglazier at ph.ed.ac.uk <mailto:dglazier at ph.ed.ac.uk>>; Lei Guo <lguo at jlab.org <mailto:lguo at jlab.org>>; nicholas <nicholas at jlab.org <mailto:nicholas at jlab.org>>; Eugene Pasyuk <pasyuk at jlab.org <mailto:pasyuk at jlab.org>>
>>>>> Cc: Adam Szczepaniak <aszczepa at jlab.org <mailto:aszczepa at jlab.org>>; Igor Strakovsky <igor at gwu.edu <mailto: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.
>>>>>  
>>>>> _______________________________________________
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>> 
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