  Angular distributions of the decay B$^+$ $\to$ K$^*$(892)$^+\mu^+\mu^-$ are
studied using events collected with the CMS detector in $\sqrt{s} =$ 8 TeV
proton-proton collisions at the LHC, corresponding to an integrated luminosity
of 20.0 fb$^{-1}$. The forward-backward asymmetry of the muons and the
longitudinal polarization of the K$^*$(892)$^+$ meson are determined as a
function of the square of the dimuon invariant mass. These are the first
results from this exclusive decay mode and are in agreement with a standard
model prediction.
