Comment on "Sixth-Order Vacuum-Polarization Contribution to the Lamb Shift of Muonic Hydrogen" by T. Kinoshita and M. Nio, Phys. Rev. Lett. 82, 3240 (1999)

TL;DR

This paper comments on a previous calculation of the Lamb shift in muonic hydrogen, highlighting an overlooked term in the $ ext{alpha}^3$ correction that could impact the accuracy of the theoretical prediction.

Contribution

It identifies an additional correction term to the Lamb shift calculation that was previously omitted by Kinoshita and Nio.

Findings

The missed term affects the $ ext{alpha}^3$ correction to the Lamb shift.

Inclusion of the term could refine theoretical predictions.

Highlights importance of comprehensive calculations in quantum electrodynamics.

Abstract

In the comment we discuss an additional term to the $\alpha^3$ correction to the Lamb shift, which was missed in the calculation by Kinoshita and Nio (Phys. Rev. Lett. 82, 3240 (1999)).