Eta-photoproduction in a gauge-invariant chiral unitary framework

Details Eta-photoproduction in a gauge-invariant chiral unitary framework Eta-photoproduction in a gauge-invariant chiral unitary framework

2011-08-24

arxiv.org/abs/1108.4825v2

Physics

Nuclear Physics

Nuclear Theory

Updated version to be published in Physics Letters B

Scientific paper

We analyse photoproduction of eta mesons off the proton in a gauge-invariant chiral unitary framework. The interaction kernel for meson-baryon scattering is derived from the leading order chiral effective Lagrangian and iterated in a Bethe-Salpeter equation. The recent precise threshold data from the Crystal Ball at MAMI can be described rather well and the complex pole corresponding to the S11(1535) is extracted. An extension of the kernel is also discussed.

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