Axial-vector contributions to the HFS of muonic hydrogen
Keywords:Hyperfine splitting, form factor, axial-vector meson, muonic hydrogen
We review the axial-vector meson contributions to the HFS of muonic hydrogen. We evaluate the impact of the singly- and doubly-virtual asymptotic behavior of the transition form factors of the axial-vector mesons. As our main result, we find an opposite sign (and a factor of 2 difference) concerning previous analyses and a novel discussion of the hadronic modeling.
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