New Evaluation of Proton Structure Corrections to Hydrogen Hyperfine Splitting

Details New Evaluation of Proton Structure Corrections to Hydrogen Hyperfine Splitting New Evaluation of Proton Structure Corrections to Hydrogen Hyperfine Splitting

2006-10-31

arxiv.org/abs/physics/0610289v1

Physics

Atomic Physics

Talk given at the International Workshop on Precision Physics of Simple Atomic Systems, Venice, Italy, 12-16 June 2006; 10 pag

Scientific paper

10.1139/P07-026

We consider the proton structure corrections to hydrogen ground-state hyperfine structure, focusing on a state-of-the-art evaluation of the inelastic nucleon corrections--the polarizability corrections--using analytic fits to the most recent data. We find a value for the fractional correction Delta_{pol} of 1.3 \pm 0.3 ppm. This is 1--2 ppm smaller than the value of Delta_{pol}$ one would deduce using hyperfine splitting data and elastic proton structure corrections obtained from modern form factor fits. In addition, we discuss the derivations of the relevant formulas, paying attention to lepton mass effects and to questions surrounding the use of unsubtracted dispersion relations.

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