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