Photo-excitation of hyperons and exotic baryon in gamma N --> K Anti-K N

Details Photo-excitation of hyperons and exotic baryon in gamma N --> K Anti-K N Photo-excitation of hyperons and exotic baryon in gamma N --> K Anti-K N

2005-11-16

arxiv.org/abs/hep-ph/0511198v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, presented at Workshop on the Physics of Excited Nucleons (NSTAR 2005), Tallahassee, Florida, 12-15 Oct 200

Scientific paper

We investigate the reaction of $\gamma N \to K \bar{K} N$ focusing on the photoproduction of $\Lambda(1520)$ and putative exotic $\Theta(1540)$. We consider various background production mechanisms including the production of vector mesons, tensor mesons, and other $\Lambda$ and $\Sigma$ hyperons. We discuss the angular distribution of $\Lambda(1520)$ photoproduction cross section and the radiative decays of $\Lambda(1520)$. We also discuss what we expect for the invariant mass distributions if the $\Theta(1540)$ is formed in the reaction, with the parameters studied so far. We find that the peak in the $KN$ invariant mass distribution, if confirmed, can hardly come from the kinematic reflections, especially, due to the tensor meson backgrounds.

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