paper

Hadronic Vacuum Polarization Contribution to the Muonium Hyperfine Splitting

arXiv:hep-ph/0107328 · doi:10.1016/S0370-2693(01)00994-7

Abstract

We discuss hadronic effects in the muonium hyperfine structure and derive an expression for the hadronic contribution to the hfs interval in form of the one-dimensional integral of the cross section of e+e- annihilation into hadrons. Higher-order hadronic contributions are also considered.

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