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

[Igor Strakovsky]

Dear Ken,

I have no problem to talk to my old friend Mark but it is unclear to me why
I have to do it.
That is your analysis and you have to defend it.  I feel guilty as a
co-author of the Mibe's
paper that I missed this fact a long time ago. But definitely
rho-rescattering diagram does
not play a critical role in the analysis of your data.

Sorry, 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 5:29 PM, Hicks, Kenneth <hicks at ohio.edu> wrote:

>  ​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, 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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>
>
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