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Bibliographic Details
Main Authors:	Cacciapaglia, Giacomo, Sannino, Francesco, Turner, Jessica
Format:	Preprint
Published:	2025
Subjects:	High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Theory
Online Access:	https://arxiv.org/abs/2509.15912
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Table of Contents:

The presence of a topological susceptibility in the electroweak sector of the Standard Model implies the existence of a pseudoscalar state in the spectrum, $η_W$. We show that, within the Standard Model, no new particle is required to form this state. We identify the $η_W$ state with the CP-odd linear combination of the ground states of hydrogen and antihydrogen atoms.