BARYOGENESIS IN AN SO(10) GUT MODEL WITH PATI-SALAM INTERMEDIATE SYMMETRY

The possibility of generating the observed baryon asymmetry of the uni verse in an SO(10) gauge model with spontaneous symmetry breaking patt ern SO(10) (M-X) under right arrow SU(4)(PS) x SU(2)(L) x SU(2)(R) (M- R) under right arrow SU(3)c x SU(2)(L) x U(1)(Y) (M-Z) under right arr ow SU(3)(c) U(1)(Q) is studied. We find it possible to generate a Delt a B = B-n(-n)(B) over bar/s similar to 10(-11), converting the leptoni c number produced at the B - L breaking scale via the B + L violating processes mediated by sphalerons at the electroweak scale. The resulti ng picture is tested against the limit coming from experimental data: proton lifetime and neutrino oscillations.