[Halld-physics] GlueX practice talk

[Igor Strakovsky]

Dear Beni,

You have 46 slides.  How long is your talk?

Then I have several comments for your consideration...

- Your intro is too long, I would make it shorter

- pg 13+: The order of how to search for hybrids does not sound...
You have to produce them, then you have to consider to know quantum
numbers, then masses and decay modes, then how to look for them...

- pg 14: How one can trust in LQCD predictions if they have m_pi ~ 400 MeV?

- pg 18: What message is in?

- pg 33: Spin-density Matrix elements do not have a connection to the cross
section.

- pg 35: You have to point out that there is a disagreement between GlueX
and SLAC measurements.  Following to Mike Dugger, SLAC had a huge
contribution from Compton

- pg 36: Do not combine pi0 and eta t-channel exchange on the same graph.
This graph is good for the forward direction only.  Dynamics for pi0 and
eta is different.  For pi0, omega-exchange plays a role while for eta there
are several meson exchanges.
Obviously, red line is your dream or model dependent thing.

- pg 44: Where are uncertainties?

That is all by now,
Igor
-----
Igor Strakovsky, SAID INS The George Washington University
Tel: 571-553-8344 <(571)%20553-8344>,Skype: igors1945_2, Fax: 202-994-3001
<(202)%20994-3001>
Cell: 703-728-5627 <(703)%20728-5627>, Emails: igor at gwu.edu, igor at jlab.org

On Tue, Jul 18, 2017 at 10:19 AM, Justin Stevens <jrsteven at jlab.org> wrote:

> FYI, slides and connection information are posted at
> https://halldweb.jlab.org/wiki/index.php/2017-07-18
>
> On Jul 17, 2017, at 9:40 AM, Beni Zihlmann <zihlmann at jlab.org> wrote:
>
> I will give a GlueX practice talk tomorrow 2pm in cc-f326
>
> cheers,
> Beni
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