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

Abstract

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.

19 pages, 2 figures, RevTeX

References in corpus (4)

• Non perturbative chiral approach to s-wave \bar{K}N interactions
• Chiral Symmetry Amplitudes in the S-Wave Isoscalar and Isovector Channels and the σ, f_0(980), a_0(980) Scalar Mesons
• Non-perturbative Approach to effective chiral Lagrangians and Meson Interactions
• Theoretical Study of the γγ-->meson-meson Reaction

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• Photoproduction of meson and baryon resonances in a chiral unitary approach
• Three-Body approach to the K^- d Scattering Length in Particle Basis
• Recent progress on the chiral unitary approach to meson meson and meson baryon interactions