2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94998Within a systematic approach based on the dimensionally regularized nonrelativistic quantum electrodynamics, we derive the complete result for the two-loop correction to order $(α/π)^2 (Z α)^4$ for the $g$ factor of an electron bound in an $nS$ state of a hydrogenlike ion. The results obtained significantly improve the accuracy of the theoretical predictions for the hydrogenlike carbon and oxygen ions and influence the value of the electron mass inferred from $g$ factor measurements.11 pages, 1 figureAtomic PhysicsHigh Energy Physics - Phenomenologytext