Angular analysis of charged and neutral $B\to K\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ decays

Abstract

The angular distributions of the rare decays $B^{+}\to K^{+}\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ and $B^0\to K_{\mathrm{S}}^0\hat{I}{¼}^{+}\hat{I}{¼}^{-}$ are studied with data corresponding to 3 fb${}^{-1}$ of integrated luminosity, collected in proton-proton collisions at 7 and 8 TeV centre-of-mass energies with the LHCb detector. The angular distribution is described by two parameters, $F_{\mathrm{H}}$ and the forward-backward asymmetry of the dimuon system $A_{\mathrm{FB}}$, which are determined in bins of the dimuon mass squared. The parameter $F_{\mathrm{H}}$ is a measure of the contribution from (pseudo)scalar and tensor amplitudes to the decay width. The measurements of $A_{\mathrm{FB}}$ and $F_{\mathrm{H}}$ reported here are the most precise to date and are compatible with predictions from the Standard Model.

27 pages, 11 figures, 2 tables. Updated to correspond to JHEP proofs