The pseudoscalar meson and baryon octet interaction with strangeness S=-2 in the unitary coupled-channel approximation  

作　　者：Bao-Xi Sun Xin-Yu Liu 

机构地区：[1]Faculty of Science,Beijing University of Technology,Beijing 100124,China

出　　处：《Communications in Theoretical Physics》2022年第7期99-104,共6页理论物理通讯（英文版）

摘　　要：The interaction of the pseudo scalar meson and the b ary on octet with strangeness S=-2 and isospin I=1/2 is investigated by solving the Bethe-Salpeter equation in the infinite and finite volume respectively.It is found that there is a resonance state generated dynamically,which owns a mass of about 1550 MeV and a large decay width of 120-200 MeV.This resonance state couples strongly to theπΞchannel.Therefore,it might not correspond to theΞ(1620)particle announced by Belle collaboration.At the same time,this problem is studied in the finite volume,and an energy level at 1570 MeV is obtained,which is between theπΞand KΛthresholds and independent of the cubic box size.

关 键 词：Bethe-Salpeter equation chiral unitary approach AMPLITUDE 

分 类 号：O572.2[理学—粒子物理与原子核物理]