The proton size, specifically its charge radius, was thought known to about 1% accuracy.
Now a new method probing the proton with muons instead of electrons finds a radius about …

At the core of the “proton radius puzzle” is a four–standard deviation discrepancy between
the proton root-mean-square charge radii (rp) determined from the regular hydrogen (H) and …

The potential of precision spectroscopy as a tool in systematic searches for effects of Lorentz
and CPT violation is investigated. Systems considered include hydrogen, antihydrogen …

We perform a new analysis of electron-proton scattering data to determine the proton electric
and magnetic radii, enforcing model-independent constraints from form factor analyticity. A …

We calculate the two-photon exchange corrections to electron-proton scattering with
nucleon and Δ intermediate states. The results show a dependence on the elastic nucleon …

Laser spectroscopy of muonic hydrogen atoms, μp, has revealed a proton root-mean-square
(rms) charge radius r E that is an order of magnitude more accurate than the CODATA world …

We give a pedagogical description of the method to extract the charge radii and Rydberg
constant from laser spectroscopy in regular hydrogen (H) and deuterium (D) atoms, that is …

We determine the charge radius of the proton by analyzing the published low momentum
transfer electron-proton scattering data from Mainz. We note that polynomial expansions of …

We show that in previous analyses of electron–proton scattering, the uncertainties in the
statistical procedure to extract the proton charge radius are underestimated. Using a fit …

Quantum interference arising from spontaneous emission, or cross-dam**, is an important
yet frequently overlooked systematic in precision spectroscopy experiments which aim to …