Theoretical study of the and resonances in decays

崩壊におけると共鳴の理論的解析

宮原 建太*; 兵藤 哲雄*; 岡 眞   ; Nieves, J.*; Oset, E.*

Miyahara, Kenta*; Hyodo, Tetsuo*; Oka, Makoto; Nieves, J.*; Oset, E.*

がとメソンーバリオン状態へ弱崩壊する過程をストレンジネスのバリオンのスペクトルの観点で解析した。

Nonleptonic weak decays of into and a meson-baryon final state, , are analyzed from the viewpoint of probing baryon resonances, i.e. and . We argue that the weak decay of is dominated by a single quark-line diagram. The decay process has an advantage of being free from meson resonances in the invariant mass distribution. The invariant mass distribution of the meson-baryon final state is calculated, assuming that the and resonances have . It is found that a clear peak for the is seen in the and spectra. We also suggest that the ratios of the , and final states are useful to distinguish whether the peak is originated from the resonance or it is a threshold effect.