  A search for the Bs->mumu and Bd->mumu decays is performed in ~300 pb-1 of pp
collisions at sqrt(s) = 7 TeV collected by the LHCb experiment at the Large
Hadron Collider at CERN. The measured limit on the branching fraction of the
Bs->mumu decay is BR(Bsmumu) < 1.6 10^{-8} at 95% confidence level, while that
of the Bd->mumu decay is BR(Bd->mumu) < 5.1 x 10^{-9} at 95% confidence level.
A combination with the 2010 dataset of LHCb yields a limit of BR(Bs->mumu) <1.5
x 10^{-8} at 95% confidence level.
