2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190727Anomalous U(1)s are omnipresent in realizations of the Standard Model using D-branes. Such models are typically non-supersymmetric, and the anomalous U(1) masses are potentially relevant for experiment. In this paper, the string calculation of anomalous U(1) masses (hep-th/0204153) is extended to non-supersymmetric orientifolds.12 pages, Latex2e. (v2) final version to be published in Phys. Lett.BHigh Energy Physics - Theorytext