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<p>Dear Colleagues,</p>
<p>Vincent Mattieu will give an interesting talk with the title
'Discovering Exotic Mesons with the GlueX Experiment' in the
theory seminar today. He will focus on the analysis of eta pi
final states<font size="+3"><span style="font-size: 10pt;"
class=""><span style="font-size: 10pt;" class=""><span
style="color: rgb(34, 34, 34); font-size: small;" class=""></span></span></span></font>.
You may find the abstract below.</p>
<p>The seminar takes place at 1pm in L102 at JLab, but it will also
broadcast via bluejeans (<a class="moz-txt-link-freetext" href="https://bluejeans.com/195615763">https://bluejeans.com/195615763</a>).</p>
<p>Best regards,</p>
<p>Alex</p>
<p><br>
</p>
<p>===</p>
<p><br>
</p>
<p>Vincent Mathieu (JLab), "Discovering Exotic Meson with the GlueX
Experiment"<br>
</p>
<p>Abstract<br>
The eta-pi final state, whose odd partial waves have exotic
quantum numbers, is one of the golden channel for hybrid meson
searches. The GlueX collaboration will soon extract moments of the
eta-pi0 angular distribution. In the perspective of these results,
we built a model for the photoproduction of eta-pi0 with a
linearly polarized beam to illustrate the influence of the P-wave
in unpolarized and polarized moments. We also generalize the
definition of the beam asymmetry for two mesons photoproduction
and show that, when the meson momenta are perpendicular to the
reaction plane, the beam asymmetry can distinguish even and odd
waves. We illustrate this beam asymmetry with our model and show
how it can be used to identify the presence of an exotic P wave.<br>
<br>
<br>
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