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Vacuum polarization in muonic atoms: the Lamb shift at low and medium Z

Savely G. Karshenboim, Vladimir G. Ivanov, Evgeny Yu. Korzinin

physics.atom-pharXiv:physics/0604133

Abstract

In muonic atoms the Uehling potential (an effect of a free electronic vacuum polarization loop) is responsible for the leading contribution to the Lamb shift causing the splitting of states with Delta n = 0 and Delta l ≠ 0. Here we consider the Lamb shift in the leading nonrelativistic approximation, i.e., within an approach based on a certain Schrodinger equation. That is valid for low and medium Z as long as (Z alpha)2 >> 1. The result is a function of a few parameters, including kappa = Z alpha m mu/me, n and l. We present various asymptotics and in particular we study a region of validity of asymptotics with large and small kappa. Special attention is paid to circular states, which are considered in a limit of n >> 1.

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