[Halld-physics] Theory seminary today

[Alexander Austregesilo]

Dear Colleagues,

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. You 
may find the abstract below.

The seminar takes place at 1pm in L102 at JLab, but it will also 
broadcast via bluejeans (https://bluejeans.com/195615763).

Best regards,

Alex


===


Vincent Mathieu (JLab), "Discovering Exotic Meson with the GlueX Experiment"

Abstract
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.


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