Order alpha^7 ln(1/alpha) Contribution to Positronium Hyperfine Splitting

Preprint

16 October 2000

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/0010159

Abstract

The logarithmically enhanced alpha^7 ln(1/alpha) contribution to the hyperfine splitting of the positronium ground-state energy levels is calculated in the framework of dimensionally regularized nonrelativistic quantum electrodynamics. The correction is negative and amounts to about 1/3 of the leading logarithmic alpha^7 ln^2(1/alpha) one. The discrepancy between the experimental measurements and the theoretical prediction is reduced.

Keywords

POSITRONIUM HYPERFINE SPLITTING
ENHANCED ALPHA
ENERGY LEVELS
ORDER ALPHA
1/ALPHA

All Related Versions

Version 1, 2000-10-16, ArXiv
Published version: Physical Review Letters, 85 (24), 5094.

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