Work

The absence of global anomalies of CP symmetry

Year: 2026

Type: article

Abstract: A bstract Some solutions to the strong CP problem assume that CP symmetry is a gauge symmetry, which is then spontaneously broken. For this scenario to be possible, the CP symmetry should not have any nonperturbative (global) anomalies. In this paper, we study anomalies of CP symmetry of fermions which are coupled to gravity and gauge fields with a gauge group G . When G is connected and simply connected, we show that gauging a CP symmetry does not produce any new anomaly beyond the one before gauging it. In particular, the standard model matter content does not have anomalies.

Source: Journal of High Energy Physics

DOI: 10.1007/jhep05(2026)250

Author: Kazuya Yonekura

Institution: Tohoku University

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funder: Japan Society for the Promotion of Science

Award: 場の量子論のトポロジーと量子異常の研究