Search for the decay Bs0 →ηη

B. Bhuyan, Indian Institute of Technology Guwahati
K. J. Nath, Indian Institute of Technology Guwahati
J. Borah, Indian Institute of Technology Guwahati
D. Joffe, Kennesaw State University

Abstract

We report results from a search for the decay Bs0→ηη using 121.4 fb-1 of data collected at the (5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We do not observe any signal and set an upper limit on the branching fraction of 14.3×10-5 at 90% confidence level. This result represents a significant improvement over the previous most stringent limit.