2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199869We study a new scenario for baryogenesis due to the spontaneous breaking of the $CPT$ invariance through the interaction between a baryon current and a hypermagnetic helicity. The hypermagnetic helicity (Chern-Simons number) of $U(1)_Y$ provides a $CPT$ violation background for the generation of baryons via sphaleron processes, which protects these baryons from the sphaleron wash-out effect in thermal equilibrium. It is shown that if the present amplitude of the resultant magnetic fields are sufficiently large, for a wide range mass scale (from TeV to the Planck scale), the observational magnitude of the baryon asymmetry of the Universe can be realized.8 pages, no figure, accepted in Phys. Lett. BHigh Energy Physics - PhenomenologyAstrophysicsHigh Energy Physics - Theorytext