[Frost] Updated my analysis page

[Franz Klein]

Mike,
Nucleon pole always means the nucleon Born term (strongest u-channel 
contribution near threshold).
Dressed vertices can be described via from factor (e.g. Nicole D'Hose's 
description of pion and sigma exchange in rho and omega production) or 
using the dynamical reaction model (aka Sato-Lee) via loop over all 
rescattering terms (mostly piN, piDelta).
Yongseok Oh's code calculate all combinations of single and double pol. 
observables (Oh's code has a sign error in the u-channel coupling).

Greetings
Franz
On Fri, 10 Jun 2011, Michael Dugger wrote:

>
> 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
>> ---------------------------------------------------------------
>

===============================================================
                   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
---------------------------------------------------------------