13 research outputs found

    Logarithmic two-loop corrections to the Lamb shift in hydrogen

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    Higher order (α/π)2(Zα)6(\alpha/\pi)^2 (Z \alpha)^6 logarithmic corrections to the hydrogen Lamb shift are calculated. The results obtained show the two-loop contribution has a very peculiar behavior, and significantly alter the theoretical predictions for low lying S-states.Comment: 14 pages, including 2 figures, submitted to Phys. Rev. A, updated with minor change

    Experimental progress in positronium laser physics

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