Work

η w -meson from topological properties of the electroweak vacuum

Year: 2025

Type: article

Abstract: We further scrutinize the evidence for a recently suggested pseudoscalar particle, the electroweak η w meson. Its existence is demanded by matching the removal of the weak vacuum angle θ w by the anomalous B + L symmetry with a massive pole in the topological susceptibility of the vacuum. We specifically focus on the possibility of the emergence of η w as a collective excitation of the phase of the condensate of the ’t Hooft fermion determinant, generated by the electroweak instantons, which breaks the B + L symmetry spontaneously. We argue that the generation of the ’t Hooft vertex is in one-to-one correspondence with its nonzero vacuum expectation value which is cutoff insensitive. We outline certain puzzles about the nature of the emergent η w which require further investigation.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/jc2g-q3nh

Authors: Gia Dvali, Archil Kobakhidze, Otari Sakhelashvili

Institutions: Max Planck Institute for Physics, Ludwig-Maximilians-Universität München, The University of Sydney

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: hybrid