Evidence for Semileptonic B- to p pbar l nubar Decays

K. -J. Tien, M. -Z. Wang, I. Adachi +166

We find evidence for the semileptonic baryonic decay $B^{-}\to p\bar{p}{\ell }^{-}{\bar{\nu }}_{\ell }$ ($\ell =e,\mu$), based on a data sample of 772 million $B\bar{B}$ pairs collected at the ${\rm Y}(4S)$ r…