Observation of the decay B s 0 → η c ϕ and evidence for B s 0 → η c π + π −

© 2017, The Author(s). A study of Bs0→ ηcϕ and Bs0→ ηcπ+π−decays is performed using pp collision data corresponding to an integrated luminosity of 3.0 fb−1, collected with the LHCb detector in Run 1 of the LHC. The observation of the decay Bs0→ ηcϕ is reported, where the ηcmeson is reconstructed in...