Электронный каталог

Статья

Afzal, A.
Freeze-in Dark Matter and Leptogenesis: a*q'SM Route / A.Afzal, R.Roshan. – Text : electronic // The European Physical Journal C. – 2026. – Vol. 86, No. 4. – P. 358. – URL: https://doi.org/10.1140/epjc/s10052-026-15537-y. – Bibliogr.: 60.

We investigate the possibility of freeze-in dark matter production and baryogenesis via leptogenesis in a *q'SM model, which is an extension of the Standard Model, featuring a residual U(1)&sub(*c) gauge symmetry. This symmetry arises from a linear combination of U(1)&sub(*c) and U(1)&sub(*q), both of which are subgroups of the E&sub(6) . The spontaneous breaking of U(1)&sub(*q') symmetry governs the dynamics of a singlet fermion, which serves as a freeze-in dark matter candidate. The dark matter mass arises from dimension-five operators, and a discrete symmetry ensures its stability. We show that freeze-in production from scalar decay can yield the correct relic abundance for dark matter masses between a few MeV to a few hundred GeV. Simultaneously, heavy right-handed neutrinos generate light neutrino masses via the type-I seesaw and produce the observed baryon asymmetry via leptogenesis.



ОИЯИ = ОИЯИ (JINR)2026