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

[Hicks, Kenneth]

?Dear Igor,


The rescattering diagram comes directly from a CLAS publication, T. Mibe et al., which was published in Phys. Rev. C (2007) with very little problem.  It is true that this is not the only diagram that can contribute, but it is likely to be the dominant mechanism to keep the deuteron bound in the final state.  Also in Mibe's paper are calculations from theorists (Mark Strickman et al) where they used this diagram to do their calculation.  So you see, at least some people see this as a reasonable argument.  I suggest you talk with Mark Strickman to see why they used this diagram in the calculation.


Best regards,

Ken


________________________________
From: clas_hadron-bounces at jlab.org <clas_hadron-bounces at jlab.org> on behalf of Igor Strakovsky <igor at gwu.edu>
Sent: Tuesday, April 7, 2015 4:49 PM
To: chetry at jlab.org
Cc: CLAS Hadron Spectroscopy
Subject: Re: [Clas_hadron] Talk on coherent rho photoproduction using g10, APS April 2015

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<mailto:igor at gwu.edu>, igor at jlab.org<mailto:igor at jlab.org>

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