Observation of B0s → K*±K±and evidence for B0s → K*π+ decays

Measurements of the branching fractions of B0s→K*±K∓ and B0s→K*±π∓ decays are performed using a data sample corresponding to − 1.0 fb -1 of 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 K0sπ± final state. The first observation of the B0s→K*±K∓ decay and the first evidence for the B0s→K8-π+ decay are reported with branching fractions B(B0s→K*±K∓) = (12.7 ± 1.9 ± 1.9) x 10-6 B(B0s→K*-K∓) = (3.3 ± 1.1 ± 0.5) x 10-6 where the first uncertainties are statistical and the second are systematic. In addition, an upper limit of B(B0s→K*±K∓)<0.4 (0.5) × 10-6 is set at 90% (95%) confidence level.