Branching fraction and CP asymmetry of the decays B⁺→K_S⁰π⁺ and B⁺→K_S⁰K⁺

An analysis of B⁺→K_S⁰π⁺ and B⁺→K_S⁰K⁺ decays is performed with the LHCb experiment. The pp collision data used correspond to integrated luminosities of 1fb^-1 and 2fb^-1 collected at centre-of-mass energies of √s=7TeV and √s=8TeV, respectively. The ratio of branching fractions and the direct CP asymmetries are measured to be B(B⁺→K_S0K⁺)/B(B⁺→K_S⁰π⁺)=0.064±0.009 (stat.)±0.004(syst.), A^CP(B⁺→K_S⁰π⁺)=-0.022±0.025(stat.)±0.010 (syst.) and A^CP(B⁺→K_S⁰K⁺)=-0.21±0.14 (stat.)±0.01 (syst.). The data sample taken at √s=7 TeV is used to search for B_c⁺→K_S⁰K⁺ decays and results in the upper limit (f_c{dot operator}B(B_c⁺→K_S⁰K⁺))/(fu{dot operator}B(B⁺→K_S⁰π⁺))<5.8×10-2 at 90% confidence level, where f_c and f_u denote the hadronisation fractions of a b- quark into a Bc+ or a B⁺ meson, respectively.