Non-perturbative chiral approach to Kp -->gamma Y reactions

Details Non-perturbative chiral approach to Kp -->gamma Y reactions Non-perturbative chiral approach to Kp -->gamma Y reactions

1998-04-23

arxiv.org/abs/nucl-th/9804053v2

Nucl.Phys. A643 (1998) 402-414

Physics

Nuclear Physics

Nuclear Theory

19 pages, 2 figures, RevTeX

Scientific paper

10.1016/S0375-9474(98)00581-8

A recently developed nonperturbative chiral approach to describe the S=-1 meson-baryon reactions has been extended to investigate the near threshold $K^- p \to \gamma \Lambda, \gamma \Sigma^0$ reactions. With the parameters governed by chiral SU(3) symmetry, we show that the predicted branching ratios $\Gamma_{K^- p \to \gamma \Lambda}/\Gamma_{K^- p \to all}$ and $\Gamma_{K^-p\to \gamma \Sigma^0}/\Gamma_{K^- p \to all}$ are close to the experimental values. The coupling with the $\eta$ channels, which was shown to be important in the $S=-1$ meson-baryon reactions, is also found to be significant here. Our results are consistent with the interpretation of the $\Lambda(1405)$ as a quasi-bound meson-baryon state as found in other similar chiral approaches.

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