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The determination of the differential branching fraction and the firstangular analysis of the decay $B_s^0\to\phi\mu^{+}\mu^{-}$ are presented usingdata, corresponding to an integrated luminosity of $1.0\,{\rm fb}^{-1}$,collected by the LHCb experiment at $\sqrt{s}=7\,{\rm TeV}$. The differentialbranching fraction is determined in bins of $q^{2}$, the invariant dimuon masssquared. Integration over the full $q^{2}$ range yields a total branchingfraction of ${\cal B}(B_s^0\to\phi\mu^{+}\mu^{-}) = (7.07\,^{+0.64}_{-0.59}\pm0.17 \pm 0.71)\times 10^{-7}$, where the first uncertainty is statistical, thesecond systematic, and the third originates from the branching fraction of thenormalisation channel. An angular analysis is performed to determine theangular observables $F_{\rm L}$, $S_3$, $A_6$, and $A_9$. The observables areconsistent with Standard Model expectations.

Differential branching fraction and angular analysis of the decay $B_s^0\to\phi\mu^{+}\mu^{-}$