Observable N–\bar{N} oscillation, high-scale see-saw

and origin of matter

R N MOHAPATRA

Department of Physics and Center for String and

Particle Theory, University of Maryland, College Park, MD 20742, USA

E-mail: rmohapat@physics.umd.edu

Abstract. See-saw mechanism has been a dominant paradigm in the

discussion of neutrino masses. We discuss how this idea can be tested

via a baryon number violating process such as $N$--$\bar{N}$

oscillation. Since the expected see-saw scale is high and the

$N$--$\bar{N}$ amplitude goes like $M^{-5}_{\rm R}$, one might think

that this process is not observable in realistic see-saw models for

neutrino masses. In this talk I show that in supersymmetric models,

the above conclusion is circumvented leading to an enhanced and

observable rate for $N$--$\bar{N}$ oscillation. I also discuss a new

mechanism for baryogenesis in generic models for

neutron--anti-neutron oscillation .

Keywords. Neutron--anti-neutron oscillation; baryogenesis.

PACS No. 11.30.Fs