Speaker
Dr
Evgeny Yu. Korzinin
(D. I. Mendeleev Institute for Metrology, St. Petersburg 190005, Russia)
Description
The Lamb shift in muonic hydrogen was measured some time ago to a high
accuracy. The theoretical prediction of this value is very sensitive to
the proton finite-size effects. The proton radius extracted from muonic
hydrogen is in contradiction with the results extracted from elastic
electron-proton scattering. That creates a certain problem for the
interpretation of the results from the muonic hydrogen Lamb shift. For the
latter we need also to take into account the two-photon-exchange
contribution with the proton finite size involved. The only way to
describe it relies on the data from the scattering, which may produce an
internal inconsistency of theory. Recently the leading proton-finite-size
contribution to the two-photon exchange was found within the external
field approximation. The recoil part of the two-photon-exchange has not
been considered. We revisit calculation of the external-field part and
take the recoil correction to the finite-size effects into account.
Author
Dr
Evgeny Yu. Korzinin
(D. I. Mendeleev Institute for Metrology, St. Petersburg 190005, Russia)
Co-authors
Prof.
Savely G. Karshenboim
(Max-Planck-Institut für Quantenoptik, Garching 85748, Germany and Pulkovo Observatory, St. Petersburg 196140, 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)
