Search for the decay B$^{0}$$_{s}$ → η$^{′}$ K$^{0}$$_{S}$

Abstract

We report the results of the first search for the decay B0s→η′K0S using 121.4  fb−1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We observe no signal and set a 90% confidence-level upper limit of 8.16×10−6 on the B0s→η′K0S branching fraction