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My be it it is not so surprising after all. May be it has to do with
the helicity conservation and vector dominance. For the circularly
polarized photon its spin is parallel or antiprallel to its
momentum. Omega has spin 1 and VDM tells us that omega and photon is
the same thing and what we see is helicity transfer from the photon
to omega. <br>
<br>
-Eugene<br>
<br>
<br>
<br>
On 6/10/11 16:11 , Patrick Collins wrote:
<blockquote cite="mid:4DF27A73.1070008@jlab.org" type="cite">
Hello all,<br>
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 F<sub>15</sub>(1680) and D<sub>13</sub>(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.<br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Patrick%27s_analysis_page#Examples_of_.CE.A3_from_g8b_for_similar_W">http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Patrick%27s_analysis_page#Examples_of_.CE.A3_from_g8b_for_similar_W</a><br>
<br>
Cheers,<br>
Patrick<br>
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