[Clas_hadron] Talk on coherent rho photoproduction using g10, APS April 2015

[Igor Strakovsky]

Dear Taya,

Thank for your good slides.  Unfortunately, your motivation, slide #2, is
problematic
for me. You added the rescattering diagram to the impulse approximation and
assume that you selected two dominant diagrams which will work for your rho
photoproduction on the deuteron.  I do not think so.  Let me guess that you
use
analogy with our analysis of the CLAS data for gd-->pi0d where critical
role plays
a rescattering mechanism with eta-meson at intermediate state and taking
into
account the fact that the first S11 has a huge BR in to etaN.  That was
good for
gd-->pi0d and allows to predict and describe a structure (close to the eta
threshold)
in the excitation function for the backward scatting (no dibaryon
contribution).
Unfortunately, your case is different.

I cannot advise how you can fix this slide but definitely, this slide is
problematic
and nobody will buy it

Kind Regards, Igor

-----
Igor Strakovsky, SAID CNS The George Washington University
Tel: 703-726-8344(NV),Skype: igors1945_2, Fax: 202-994-3001(FB),
Emails: igor at gwu.edu, igor at jlab.org

On Tue, Apr 7, 2015 at 1:53 PM, <chetry at jlab.org> wrote:

> Dear all,
>
> I am going to give a contributed talk in the APS April Meeting, which is
> less than a week from now. My talk is titled "Coherent rho-meson
> photoproduction off deuterium from CLAS".
>
> This talk will present preliminary cross sections obtained from the g10
> data set. This utilizes fits about the &#961; peak within the invariant
> mass spectrum of the &#960;+&#960;&#8722; pair for bins in the 4-momentum
> transfer, t, as a function of E&#947;. This result will help improve
> understanding of nucleon scattering. In addition, this study is also
> important to understand the backgrounds in analyses of a possible d&#8727;
> dibaryon resonance that has the same final state.
>
> You can find the slides at
>
>
> https://www.jlab.org/Hall-B/secure/hadron/presentations/2015/APS_2015_coherent_rho_Taya.pdf
>
> Any comments or suggestions would highly be appreciated.
>
> The talk is on Sunday, April 12th at 11:09 am.
>
> Regards,
> Taya Chetry
>
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