Understanding the nature of in a coupled-channel approach

結合チャネル法によるの性質の理解

L, Q.-F.*; 永廣 秀子*; 保坂 淳

L, Q.-F.*; Nagahiro, Hideko*; Hosaka, Atsushi

We perform a systematic analysis of the mass and strong decays of the (2012) resonance in a coupled -channel approach of a bare three-quark state and a composite meson-baryon state. Besides the coupling of the bare state and * channel, the effective meson-baryon interactions are also included. We find a pole with a mass of 2008 MeV by solving the Bethe-Salpeter equation. The calculated decay widths and its ratios of branching fractions / agree well with the new experimental measurement by the Belle Collaboration. Our results suggest that both three-quark core and * channel are essential for the description of the (2012) resonance. We expect that present calculations can help us to better understand the nature of (2012) resonance.