Strong decays of singly heavy baryons from a chiral effective theory of diquarks

ダイクォークのカイラル有効理論に基づく重クォークバリオンの強い相互作用による崩壊

Kim, Y.*; 岡 眞   ; 末永 大輝*; 鈴木 渓   

Kim, Y.*; Oka, Makoto; Suenaga, Daiki*; Suzuki, Kei

重いクォークを1個含むバリオンは重クォークとダイクォークの束縛状態として記述できる。本研究では、ダイクォークのカイラル有効理論に基づき、ダイクォーク間のパイオン結合による遷移を模型化して、重バリオンの崩壊確率に関する研究を行った。

A chiral effective theory of scalar and vector diquarks is formulated, which is based on chiral symmetry and includes interactions between scalar and vector diquarks with one or two mesons. We find that the diquark interaction term with two mesons breaks the and flavor symmetries. To determine the coupling constants of the interaction Lagrangians, we investigate one-pion emission decays of singly heavy baryons (, and , , ), where baryons are regarded as diquark-heavy-quark two-body systems. Using this model, we present predictions of the unobserved decay widths of singly heavy baryons. We also study the change of masses and strong decay widths of singly heavy baryons under partial restoration of chiral symmetry.