Comment on "Nucleon spin-averaged forward virtual Compton tensor at large Q^2"

Abstract

In recent work, Hill and Paz apply the operator product expansion to forward doubly virtual Compton scattering. The resulting large-$Q^2$ form of the amplitude $W_1(0,Q^2)$ is compatible with the one we obtain by extrapolation of low-$Q^2$ 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 an overestimate arising from the inclusion of the proton pole term in the subtracted dispersion relation for $W_1$.

3 pages; version accepted for publication

References in corpus (5)

• Using effective field theory to analyse low-energy Compton scattering data from protons and light nuclei
• Proton polarisability contribution to the Lamb shift in muonic hydrogen at fourth order in chiral perturbation theory
• Forward virtual Compton scattering and the Lamb shift in chiral perturbation theory
• Nucleon spin-averaged forward virtual Compton tensor at large $Q^2$
• Model independent determination of the muonic hydrogen Lamb shift and proton radius

Cited by in corpus (1)

• The deuteron-radius puzzle is alive: A new analysis of nuclear structure uncertainties