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New experimental constraints on polarizability corrections to hydrogen hyperfine structure

Vahagn Nazaryan, Carl E. Carlson, Keith A. Griffioen

hep-pharXiv:hep-ph/0512108

Abstract

We present a state-of-the-art evaluation of the polarizability corrections--the inelastic nucleon corrections--to the hydrogen ground-state hyperfine splitting using analytic fits to the most recent data. We find a value Δ pol = 1.3 0.3 ppm. This is 1--2 ppm smaller than the value of Δ pol deduced using hyperfine splitting data and elastic nucleon corrections obtained from modern form factor fits.

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