# Potential observation of the $\Upsilon \left(6S\right)\to \Upsilon \left({1}^{3}{D}_{J}\right)\eta$ transitions at Belle II

Huang, Qi (School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China) (Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China) ; Xu, Hao (School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China) (Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China) ; Liu, Xiang (School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China) (Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China) ; Matsuki, Takayuki (Tokyo Kasei University, 1-18-1 Kaga, Itabashi, Tokyo 173-8602, Japan) (Theoretical Research Division, Nishina Center, RIKEN, Wako, Saitama 351-0198, Japan)

18 May 2018

Abstract: We perform the investigation of two-body hidden-bottom transitions of the $\Upsilon \left(6S\right)$, which include $\Upsilon \left(6S\right)\to \Upsilon \left({1}^{3}{D}_{J}\right)\eta \left(J=1,2,3\right)$ decays. For estimating the branching ratios of these processes, we consider contributions from the triangle hadronic loops composed of $S$-wave ${B}_{\left(s\right)}$ and ${B}_{\left(s\right)}^{*}$ mesons, which are a bridge to connect the $\Upsilon \left(6S\right)$ and final states. Our results show that both of the branching ratios of these decays can reach ${10}^{-3}$. Because of such considerable potential to observe these two-body hidden-bottom transitions of the $\Upsilon \left(6S\right)$, we suggest the forthcoming Belle II experiment to explore them.

Published in: Physical Review D 97 (2018)