BARYON ASYMMETRY OF THE PROTON SEA AT LOW-X

We predict a nonvanishing baryon asymmetry of the proton sea at low x. It is expected to be about 7% and nearly x-independent at x < 0.5 x 1 0(-3). The asymmetry arises from the baryon-antibaryon component of th e Pomeron, rather than from the valence quarks of the proton, which ar e wide believed carriers of baryon number. Experimental study of x-dis tribution of the baryon asymmetry of the proton sea can be pet-formed in ep or gamma p interactions at HERA, where x similar to 10(-5) are r eachable, smaller than at any of existing or planned proton colliders.