Relativistic nuclear recoil effects in hyperfine splitting of hydrogenic systems
Abstract
Finite nuclear mass (Z\,α)2\,m/M\,EF corrections to the hyperfine splitting in hydrogenic systems are calculated using a combined relativistic heavy particle and nonrelativistic quantum electrodynamics. The obtained results are in disagreement with previous calculations by Bodwin and Yennie [Phys. Rev. D 37, 498 (1988)]. The comparison of improved theoretical predictions with the corresponding measurements in hydrogen reveals 2\,σ discrepancy, which may indicate problems with the proton structure corrections.
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