Search for B→p¯e-ν¯eX decay using a partial reconstruction method

Using data collected on the Y(4S) resonance and the nearby continuum by the CLEO detector at the Cornell Electron Storage Ring, we have searched for the semileptonic decay of B mesons to e (p) over bar inclusive final states. We obtain an upper limit for b-->c decays of B(B-->(p) over bare(-)(nu) over bar X-e)<5.9x10(-4). For the b-->u decay, we find an upper limit of B(B--->p (p) over bare(-)(nu) over bar (e))<1.2x10(-3) based on a V-A model, while a phase space model gives an upper limit of B(B--->p (p) over bare(-)(nu) over bar (e))<5.2x10(-3). All upper limits are measured at the 90% confidence level.