The proton size puzzle: experiment vs theoryстатья
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Дата последнего поиска статьи во внешних источниках: 20 декабря 2019 г.
Аннотация:Current status of the proton size puzzle from experimental and theoretical points
of view is briefly discussed. The interest to these studies is primarily related to
experiments conducted by the CREMA collaboration (Charge Radius Experiments
with Muonic Atoms) with muonic hydrogen and deuterium by methods
of laser spectroscopy. As a result a more accurate value of the proton charge
radius was found to be rp = 0.84184(67) fm, which is different from the value
recommended by CODATA for 7.
In the second part we discuss recent calculations of the contribution of light
pseudoscalar (PS) and axial-vector (AV) mesons to the interaction operator of a
muon and a proton in muonic hydrogen atom, with the coupling of mesons to
the muon being via two-photon intermediate state. Numerical estimates of the
contributions to the hyperfine structure of the spectrum of the S and P levels are
presented. It is shown that such contribution to the hyperfine splitting in muonic
hydrogen is rather important for a comparison with precise experimental data.