Order alpha^7 ln(1/alpha) Contribution to Positronium Hyperfine Splitting
High Energy Physics - Phenomenology
2016-09-06 v1
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.
Cite
@article{arxiv.hep-ph/0010159,
title = {Order alpha^7 ln(1/alpha) Contribution to Positronium Hyperfine Splitting},
author = {Bernd A. Kniehl and Alexander A. Penin},
journal= {arXiv preprint arXiv:hep-ph/0010159},
year = {2016}
}
Comments
8 pages (Latex)