[Frost] Updated my analysis page

[Michael Dugger]

Franz,

I wanted to better understand what you wrote and have a few questions:

* When you say "nucleon pole" are you talking about the Nucleon Born term?

* When you say that the "Oh-Lee model it looks very similar to Patrick's 
results" are you talking about the Sigma data or Czz data? Is there 
predictions for the Czz data from the Oh-Lee model?

* When you write "The loop contributions to the dressed vertex" are you 
referring to a vertex form factor?

Thanks,
Michael

On Fri, 10 Jun 2011, Franz Klein wrote:

>
> Patrick,
> your results look interesting. I agree with Mike that OBE (pion,eta) cannot 
> produce Beam-Target asymmetry, whether the 'pomeron' does, depends on whether 
> you use Landshoff (0+ with 1- component) or VMD model (0+).
> Even with OBE dominance near threshold, there is still the nucleon pole, 
> which makes a large contribution in BT asymmetries, esp. with circ.pol. beam 
> (actually in the Oh-Lee model it looks very similar to Patricks results ... 
> possibly there is also some off-shell F15 (and D13).
> When looking at omega production near threshold, the loop contribution in the 
> dressed vertex are rather strong: thus as Igor points out, look at Mark's 
> work (~EBAC).
>
> My 2 cents Franz
> On Fri, 10 Jun 2011, Patrick Collins wrote:
>
>> Hello all,
>> To demonstrate what I was talking about yesterday about t-channel in
>> omega I've added a couple of plots of beam asymmetry for omega from g8b
>> with similar W values at the bottom of my page. You can see that the
>> forward angles are close to zero asymmetry. I took a look at Williams PWA
>> and he does say that there are two strong resonances in omega production
>> near threshold the F15(1680) and D13(1700), so these could be producing
>> the large helicity asymmtries. I just don't understand why they would be
>> so strong here and so weak in beam asymmetry, especially in the forward
>> direction which normally where t-channel is very strong.
>> 
>> http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Patrick%27s_analysis_page#Ex
>> amples_of_.CE.A3_from_g8b_for_similar_W
>> 
>> Cheers,
>> Patrick
>> 
>> 
>
> ===============================================================
>                  Franz J. Klein, Associate Professor
>                  CUA, Department of Physics
>                  Washington, DC 20064
>  office: Hannan Hall 206          phone: 202-319-6190
>  or: Jefferson Lab,CC F-243       phone: 757-269-6672
> ---------------------------------------------------------------