  A search for the decays Bs->mumu and Bd->mumu is performed with about 37 pb-1
of pp collisions at \sqrt(s) = 7 TeV collected by the LHCb experiment at the
Large Hadron Collider at CERN. The observed numbers of events are consistent
with the background expectations. The resulting upper limits on the branching
fractions are BR(Bs->mumu) < 5.6 * 10^{-8} and B(Bd->mumu) <1.5 * 10^{-8} at
95% confidence level.
