[ee] TCS-JPsi meeting on Thursday at 9 am EST

[Stepan Stepanyan]

Valery,

There is no argument and everyone will agree with you that 11 GeV is  better. However, this document that was circulated is for discussion in RG-A for experiment E12-12-001. Most of proposed measurements in that experiment can be done with even 10 GeV beam (note pentaquark are not part of that experiment). It is more likely that we will not have full 5 pass energy for while, and requesting for an energy that will not be available will put us in disadvantage. For example, one can argue that since machine cannot deliver 11 GeV and experiment can only run with 11 GeV, then no reason to accommodate other run conditions from that experiment (torus setting, trigger, luminosity …) until the beam energy will be acceptable. 

Stepan
 
> On Apr 7, 2017, at 4:35 PM, Valery Kubarovsky <vpk at jlab.org> wrote:
> 
> I suggest just to change10 GeV electron beam energy to 11. That's it.
> 
> 
> From: "Stepan Stepanyan" <stepanya at jlab.org>
> To: "Pawel Nadel-Turonski" <turonski at jlab.org>
> Cc: "Valery Kubarovsky" <vpk at jlab.org>, ee at jlab.org
> Sent: Friday, April 7, 2017 4:26:23 PM
> Subject: Re: [ee] TCS-JPsi meeting on Thursday at 9 am EST
> The threshold is ~10 GeV. At 10.5 GeV photon energy the W=4.54 GeV, the heaviest pentaquark mass is 4.45 GeV. Not much cushion but still doable. 
> 
> Stepan
> 
> On Apr 7, 2017, at 4:22 PM, Pawel Nadel-Turonski <turonski at jlab.org <mailto:turonski at jlab.org>> wrote:
> 
> Hi Valery,
> 
> This is a very good point. But we may not have an energy higher than 10.6 GeV available to us this fall. Perhaps we should try to make an argument to the new management for trying to get the energy up to nominal as soon as possible?
> 
> Cheers,
> Pawel
> 
> 
> On Apr 7, 2017, at 3:28 PM, Valery Kubarovsky <vpk at jlab.org <mailto:vpk at jlab.org>> wrote:
> 
> Hi Charles,
> 
> The threshold photon energy for the LHCb pentaquark (J/psi-p) production
> gamma+p--> P5 --> J/psi+p
> is 10.5 GeV. It means that the election energy has to be 11 GeV.
> I don't think that we want to miss the possibility to found the signal in the photo production reaction.
> 
> Regards,
> Valery
> 
> From: "Charles Earl Hyde" <hyde at jlab.org <mailto:hyde at jlab.org>>
> To: "Pawel Nadel-Turonski" <turonski at jlab.org <mailto:turonski at jlab.org>>
> Cc: ee at jlab.org <mailto:ee at jlab.org>
> Sent: Thursday, April 6, 2017 10:28:08 AM
> Subject: Re: [ee] TCS-JPsi meeting on Thursday at 9 am EST
> Pawel, Stepan, et al
> Here is my summary of the Run Group A requirements for  TCS/J-Psi
> from this morning's meeting.
> I think it will be important to send a version of this (probably marked
> preliminary)
> to all RGA spokespersons before the first RGA meeting, possibly scheduled for
> next week.
> 
> Revisions and additions are welcome  (maybe some of my editorial comments
> should be removed from the request we send to RGA).
> I think it will be helpful to be as specific/quantitative as possible,
> even if many things
> are uncertain and most will be subject to collaborative negotiation.
> 
> Charles E. Hyde
> University Professor of Physics
> Old Dominion University
> www.odu.edu/~chyde <http://www.odu.edu/~chyde>
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