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Alvin Kiswandhi

Flarida State University
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A model for $\pi \eta$ photoproduction

We describe a model of $\pi \eta N$ photoproduction based on a
phenomenological Lagrangian approach that satisfies two-body unitary and is
relativistic. Unitarity is ensured by using the Lippmann-Schwinger equation to
iterate the vertices and dress the propagators to all orders, and by including
all possible two-body and quasi-two-body intermediate channels. This model has
been tested by investigating $\pi \pi N$ photoproduction. A preliminary
comparison of our calculation to an existing $\pi \pi N$ photoproduction study
is made, and is shown to produce consistent results. We have also calculated
the sum of the nonresonant Born diagrams in $\pi \eta N$ photoproduction and
compared the resulting observables to invariant mass distributions from the
CB-ELSA collaboration.

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