Study of X(5568) in a unitary coupled-channel approximation of BK and B_sπ  

作　　者：孙宝玺 董方勇 庞景龙 

机构地区：[1]College of Applied Sciences, Beijing University of Technology, Beijing 100124, China [2]Department of Physics, Peking University, Beijing 100871, China

出　　处：《Chinese Physics C》2017年第7期73-78,共6页中国物理C（英文版）

摘　　要：The potential of the B meson and the pseudoscalar meson is constructed up to the next-to-leading order Lagrangian, and then the BK and Bsπ interaction is studied in the unitary coupled-channel approximation. A resonant state with a mass about 5568 MeV and J^P= 0^＋is generated dynamically, which can be associated with the X（5568） state announced by the D0 Collaboration recently. The mass and the decay width of this resonant state depend on the regularization scale in the dimensional regularization scheme, or the maximum momentum in the momentum cutoff regularization scheme. The scattering amplitude of the vector B meson and the pseudoscalar meson is calculated, and an axial-vector state with a mass near 5620 MeV and J^P= 1^＋is produced. Their partners in the charm sector are also discussed.The potential of the B meson and the pseudoscalar meson is constructed up to the next-to-leading order Lagrangian, and then the BK and Bsπ interaction is studied in the unitary coupled-channel approximation. A resonant state with a mass about 5568 MeV and J^P= 0^＋is generated dynamically, which can be associated with the X（5568） state announced by the D0 Collaboration recently. The mass and the decay width of this resonant state depend on the regularization scale in the dimensional regularization scheme, or the maximum momentum in the momentum cutoff regularization scheme. The scattering amplitude of the vector B meson and the pseudoscalar meson is calculated, and an axial-vector state with a mass near 5620 MeV and J^P= 1^＋is produced. Their partners in the charm sector are also discussed.

关 键 词：chiral Lagrangian meson-meson interactions exotic mesons 

分 类 号：O572.33[理学—粒子物理与原子核物理]