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We present a measurement of form-factor independent angular observables inthe decay \mbox{$B^0\to K^{*}(892)^{0}\mu^+ \mu^-$}. The analysis is based on adata sample corresponding to an integrated luminosity of 1.0fb$^{-1}$,collected by the LHCb experiment in $pp$ collisions at a center-of-mass energyof 7TeV. Four observables are measured in six bins of the dimuon invariant masssquared, $q^2$, in the range $0.1<q^2<19.0$GeV$^{2}$/c$^{4}$. Agreement withStandard Model predictions is found for 23 of the 24 measurements. A localdiscrepancy, corresponding to $3.7$ Gaussian standard deviations, is observedin one $q^2$ bin for one of the observables. Considering the 24 measurements asindependent, the probability to observe such a discrepancy, or larger, in oneis $0.5\%$.

Measurement of form-factor independent observables in the decay $B^{0} \to K^{*0} \mu^+ \mu^-$