[Halld-physics] draft of proposed contributed talk at Medellin next Wednesday

[Shepherd, Matthew]

Dave,

It would be very good to get in the habit of having practice talks for all speakers so that we can see and discuss the slides.  This could be done, for example, at a physics working group meeting, like the one we are having this morning.  In the past, speakers have coordinated with Volker who schedules the talks.

While not indicated on your slide, slide 5 of your talk is explicitly in the context of the flux tube model.  LQCD calculations, assuming they are correct, indicate that this model doesn't accurately represent the hybrid spectrum.  The picture from LQCD is that the gluonic excitation has JPC = 1+-.  Therefore you should combine this with qq of S=1 and S=0 (L=0) to get the lightest set of hybrids:  0-+, 1-+, 2-+ and 1- -.  (Additional L produces other JPC hybrids and exotics.)  

It would be good update that slide.  The flux tube model provided guidance 10-15 years ago when the experiment was being proposed, but we’ve learned much more since then from LQCD.  We should recognize the impressive efforts of our colleagues doing LQCD calculations to help us understand what type of hybrid spectrum QCD generates.

Enjoy Colombia!

Matt

---------------------------------------------------------------------
Matthew Shepherd, Associate Professor
Department of Physics, Indiana University, Swain West 265
727 East Third Street, Bloomington, IN 47405

Office Phone:  +1 812 856 5808

> On Nov 29, 2015, at 7:59 PM, Dave Mack <mack at jlab.org> wrote:
> 
> 
> Trying again.
> 
> ----- Original Message -----
> From: "mack" <mack at jlab.org>
> To: "halld-phys" <halld-phys at jlab.org>
> Sent: Saturday, November 28, 2015 7:29:33 PM
> Subject: Re: draft of proposed contributed talk at Medellin next Wednesday
> 
> Dear GlueX Collaborators,
> 
> I submit for your consideration, comments, and approval my slides for a proposed contributed talk to be given this coming Wednesday in Medellin.
> 
> https://cnidlamp.jlab.org/RareEtaDecay/JDocDB/node/84
> 
> It looks long-ish, but according to the schedule we now have 30 minute slots, and I finished in 24.5 minutes the first time thru.  
> 
> sincerely,
> 
> Dave Mack
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