Comment on 'Nucleon spin-averaged forward virtual Compton tensor at large Q2'

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    In recent work, Hill and Paz apply the operator product expansion to forward doubly virtual Compton scattering. The resulting large-Q2 form of the amplitude W1(0,Q2) is compatible with the one we obtain by extrapolation of low-Q2 results from a chiral effective field theory, providing support for our approach. That paper also presents a result for the two-photon contribution to the Lamb shift in muonic hydrogen that has a much larger uncertainty than in previous work. We show that this is an overestimate arising from the inclusion of the proton pole term in the subtracted dispersion relation for W1.

    Original languageEnglish
    Article number038503
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Issue number3
    Publication statusPublished - 31 Aug 2018


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