Search for the decay $B^0\to p\overline{p}$

We present the result of a search for the charmless two-body baryonic decay $B^0\to p\overline{p}$ in a sample of 88 million ${\rm Y}\mathrm{}\left(4S\right)\mathrm{}\to B\overline{B}$ decays collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B Factory. We use Cherenkov radiation to identify protons cleanly, and determine the signal yield with a maximum-likelihood fit technique using kinematic and topological information. We find no evidence for a signal and place a 90% confidence-level upper limit of $\mathcal{B}{(B}^0\to p\overline{p})<\mathrm{}2.7\mathrm{}\times {10}^{-7}.$