Observation of B⁰ _s→ K^∗±K^∓and evidence for B⁰ _s→ K^∗-π⁺decays

Measurements of the branching fractions of B⁰ _s→ K^∗±K^∓and B⁰ _sK^∗±π^∓decays are performed using a data sample corresponding to 1.0 fb^-1of proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of 7 TeV, where the K^∗±mesons are reconstructed in the K⁰ _sπ^±final state. The first observation of the B⁰ _s→ K^∗±K^∓decay and the first evidence for the B⁰ _s→ K^∗-π⁺decay are reported with branching fractions (Equation presented), where the first uncertainties are statistical and the second are systematic. In addition, an upper limit of B(B⁰→ K^∗±K^∓) < 0.4 (0.5) × 10^-6is set at 90% (95%) confidence level.