B_{s1}(5830) and B_{s2}^*(5840)

Abstract

In this paper we investigate the strong decays of the two newly observed bottom-strange mesons $B_{s1}(5830)$ and $B_{s2}^{\ast }(5840)$ in the framework of the quark pair creation model. The two-body strong decay widths of $B_{s1}(5830{)}^0\to B^{\ast +}{K}^{-}$ and $B_{s2}^{\ast }(5840{)}^0\to B^{+}{K}^{-},B^{\ast +}{K}^{-}$ are calculated by considering $B_{s1}(5830)$ to be a mixture between ${|}^1{P}_1>$ and ${|}^3{P}_1>$ states, and $B_{s2}^{\ast }(5840)$ to be a ${|}^3{P}_2>$ state. The double pion decay of $B_{s1}(5830)$ and $B_{s2}^{\ast }(5840)$ is supposed to occur via the intermediate state $\sigma$ and $f_0(980)$. Although the double pion decay widths of $B_{s1}(5830)$ and $B_{s2}^{\ast }(5840)$ are smaller than the two-body strong decay widths of $B_{s1}(5830)$ and $B_{s2}^{\ast }(5840)$, one suggests future experiments to search the double pion decays of $B_{s1}(5830)$ and $B_{s2}^{\ast }(5840)$ due to their sizable decay widths.

Comments: 9 pages, 8 figures and 6 tables. More references and discussions added, typos corrected, some descriptions changed. Publication version in PRD