Phys. Rev. D 58, 128701 (1998) [3 pages]Comment on “Nonrelativistic QED and next-to-leading hyperfine splitting in positronium”Received 22 June 1998; published 12 November 1998 In a recent paper, the t-channel two-photon exchange contribution to the coefficients of nonrelativistic quantum electrodynamics (NRQED) four-fermion interaction were found. However while doing the matching two NRQED diagrams were lost. We have done these calculations for the case of different particle masses in the Λ-cutoff regularization scheme and present here the corrected result. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.58.128701
DOI:
10.1103/PhysRevD.58.128701
PACS:
12.20.Ds, 11.10.St, 31.15.Md, 31.30.Jv
See AlsoOriginal Article: P. Labelle, S. M. Zebarjad, and C. P. Burgess, Nonrelativistic QED and next-to-leading hyperfine splitting in positronium, Phys. Rev. D 56, 8053 (1997). |
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