[Frost] Updated my analysis page

[Franz Klein]

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
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