The corresponded study was conducted by Belle Collaboration. This research aims to obtain \ B±→J/ψη(η→γγ)K± signal yield as well as J/ψη invariant mass spectrum. The analysis is based on a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 9 fb−1 of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV