Speaker
Prof.
Savely G. Karshenboim
(Max-Planck-Institut für Quantenoptik, Garching 85748, Germany and Pulkovo Observatory, St. Petersburg 196140, Russia)
Description
There has been for a while a large discrepancy between the values of the proton charge radius measured by the Lamb shift in muonic hydrogen and by
other methods. It has already been clear that theory of muonic hydrogen is
reliable at the level of this discrepancy and an error there cannot be a
reason for the contradiction. Still the status of theory at the level of
the uncertainty of the muonic-hydrogen experiment (which is two orders of
magnitude below the discrepancy level) requires an additional
clarification. We revisit theory of the 2p − 2s Lamb shift in muonic
hydrogen. We summarize all the theoretical contributions in order α^5
m, including pure quantum electrodynamics (QED) ones as well as those
which involve the proton-structure effects. Certain enhanced higher-order
effects are also discussed. We basically confirm former QED calculations
of other authors, present a review of recent calculations of the
proton-structure effects, and treat self-consistently higher-order
proton-finite-size corrections. Eventually, we derive a value of the
root-mean-square proton charge radius. It is found to be
0.84029(55) fm, which is slightly different from that
previously published in the literature (0.84087(39) fm
[Antognini et al., Science 339, 417 (2013)]).
Author
Prof.
Savely G. Karshenboim
(Max-Planck-Institut für Quantenoptik, Garching 85748, Germany and Pulkovo Observatory, St. Petersburg 196140, Russia)
Co-authors
Dr
Evgeny Yu. Korzinin
(D. I. Mendeleev Institute for Metrology, St. Petersburg 190005, Russia)
Dr
Valery A. Shelyuto
(D. I. Mendeleev Institute for Metrology, St. Petersburg 190005, Russia)
Dr
Vladimir G. Ivanov
(Pulkovo Observatory, St. Petersburg 196140, Russia)
