The ${\rm Y}(nS)$ $\to$ $B_c^{\ast }\pi$, $B_c^{\ast }K$ decays with perturbative QCD approach

Abstract

Besides the traditional strong and electromagnetic decay modes, ${\rm Y}(nS)$ meson can also decay through the weak interactions within the standard model of elementary particle. With anticipation of copious ${\rm Y}(nS)$ data samples at the running LHC and coming SuperKEKB experiments, the two-body nonleptonic bottom-changing ${\rm Y}(nS)$ $\to$ $B_c^{\ast }\pi$, $B_c^{\ast }K$ decays ($n$ $=$ 1, 2, 3) are investigated with perturbative QCD approach firstly. The absolute branching ratios for ${\rm Y}(nS)$ $\to$ $B_c^{\ast }\pi$ and $B_c^{\ast }K$ decays are estimated to reach up to about $10^{-10}$ and $10^{-11}$, respectively, which might possibly be measured by the future experiments.

Comments: 16 pages, 3 figures