Beyond Neutrino Mass: Observable $n$–$\overline{n}$ Oscillations in UV Complete Seesaw Models

by Shaikh Saad (Jozef Stefan Institute, Ljubljana)

Tuesday 18 Nov 2025, 11:30 → 13:00 Europe/Rome

Aula Seminari (Laboratori Nazionali di Frascati)

Next-generation experiments like DUNE and NNBAR will greatly enhance sensitivity to neutron--antineutron oscillations, a direct probe of baryon number violation ($\Delta B = 2$) beyond the Standard Model. This talk discusses such oscillations in unified frameworks that also explain fermion and neutrino masses via seesaw mechanisms. Two scenarios will be discussed: (1) Type II seesaw with two color-sextet scalars, realizable in $SO(10)$/Pati--Salam models, and (2) Type III seesaw with a sextet scalar and color-octet fermion, naturally embedded in $SU(5)$. In both cases, the same dynamics linking fermion masses induces baryon violation, tying oscillations to flavor structure. Upcoming searches can probe new colored states up to $10^{11}$ GeV---far beyond collider reach---making $n$--$\overline{n}$ oscillations a rare low-energy window into grand unification and ultra-heavy new physics.

 

 

 

 

 

 

 

Locandina_Saad.docx