arxiv: 1403.8045 · v2 · submitted 2014-03-31 · ✦ hep-ex
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Angular analysis of charged and neutral B to K μ^+μ^- decays
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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.
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Cited by 2 Pith papers
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First measurement of A_FB and F_H in B+→π+μ+μ− decay is consistent with Standard Model predictions in both high- and low-mass dimuon regions.
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