Angular analysis of the decay B⁺ → K⁺µ⁺µ⁻ in proton-proton collisions at √s = 8 TeV

The angular distribution of the flavor-changing neutral current decay B⁺ → K⁺µ⁺µ⁻ is studied in proton-proton collisions at a center-of-mass energy of 8 TeV. The analysis is based on data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 20.5 fb⁻¹. The forward-backward asymmetry A_FB of the dimuon system and the contribution F_H from the pseudoscalar, scalar, and tensor amplitudes to the decay width are measured as a function of the dimuon mass squared. The measurements are consistent with the standard model expectations.