Search for the decay $B_s^0\to J/\ddot{I}ˆ\ddot{I}{€}^0$ at Belle experiment

Abstract

We have analyzed 121.4 fb${}^{-1}$ of data collected at the $\hat{I}\yen (5S)$ resonance by the Belle experiment using the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider to search for the decay $B_s^0\to J/\ddot{I}ˆ\ddot{I}{€}^0$. We observe no signal and report an upper limit on the branching fraction $\mathcal{B}(B_s^0\to J/\ddot{I}ˆ\ddot{I}{€}^0)$ of $1.21\times 10^{-5}$ at 90\% confidence level. This result is the most stringent, improving the previous bound by two orders of magnitude.

Published in PRD