Measurement of Form-Factor-Independent Observables in the Decay B0→K*0μ+μ−

We present a measurement of form-factor-independent angular observables in the decay ${B}^{0}ensuremath{rightarrow}{K}^{*}(892{)}^{0}{ensuremath{mu}}^{+}{ensuremath{mu}}^{ensuremath{-}}$. The analysis is based on a data sample corresponding to an integrated luminosity of $1.0text{ }text{ }{mathrm{fb}}^{ensuremath{-}1}$, collected by the LHCb experiment in $pp$ collisions at a center-of-mass energy of 7 TeV. Four observables are measured in six bins of the dimuon invariant mass squared ${q}^{2}$ in the range $0.1<{q}^{2}<19.0text{ }text{ }{mathrm{GeV}}^{2}/{c}^{4}$. Agreement with recent theoretical predictions of the standard model is found for 23 of the 24 measurements. A local discrepancy, corresponding to 3.7 Gaussian standard deviations is observed in one ${q}^{2}$ bin for one of the observables. Considering the 24 measurements as independent, the probability to observe such a discrepancy, or larger, in one is 0.5%.