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Free keywords:
High Energy Physics - Experiment, hep-ex
MPINP:
LHCb - Abteilung Hofmann
Abstract:
The angular distributions of the rare decays $B^+ \to K^+\mu^+\mu^-$ and $B^0
\to K^0_{\rm\scriptscriptstyle S}\mu^+\mu^-$ 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, $F_{\rm H}$
and the forward-backward asymmetry of the dimuon system $A_{\rm FB}$, which are
determined in bins of the dimuon mass squared. The parameter $F_{\rm H}$ is a
measure of the contribution from (pseudo)scalar and tensor amplitudes to the
decay width. The measurements of $A_{\rm FB}$ and $F_{\rm H}$ reported here are
the most precise to date and are compatible with predictions from the Standard
Model.