Missing (up) Mass, Accidental Anomalous Symmetries, and the Strong CP Problem

1994/03/01 by Tom Banks, Banks, Tom, Yosef Nir +3 · 1 citation
Physics and Astronomy · Social Sciences · #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #International Science and Diplomacy #Particle physics theoretical and experimental studies #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/9403203

19 pages, WIS-94/14/Feb-PH, RU-94-24

arxiv created 1994/03/01 · openalex publication_date 1994/03/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We reconsider the massless up quark solution of the strong CP problem. We show that an anomaly free horizontal symmetry can naturally lead to a massless up quark and to a corresponding accidental anomalous symmetry. Reviewing the controversy about the phenomenological viability of m_u=0 we conclude that this possiblity is still open and can solve the strong CP problem. To appear in the Proceedings of The Yukawa Couplings and the Origins of Mass Workshop.

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• Naturalness Under Stress

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