![]() ![]() ![]() Finally, we discuss the forthcoming new generation of refined experiments and theoretical calculations that aim to definitely end the debate on the proton size. We report on a comprehensive reinterpretation of the existing cross-section data for elastic electron-proton scattering obtained by the initial-state radiation. ![]() We assess the precision and reliability of available experimental data, with particular focus on the most recent results. Elastic electron-proton scattering (e-p) and the spectroscopy of hydrogen atoms are the two methods traditionally used to determine the proton charge radius, r p. We provide a brief history of the proton before describing the techniques used to measure its radius and the current status of the field. Is the ‘proton-radius puzzle’ now resolved? In this Review, we scrutinize the experimental studies of the proton radius to gain insight on this issue. the root-mean-square (rms) charge radius of the proton (Rp) has for years been believed to be about 0.88 fm, with 1 uncertainty. Research Center for Electron-Photon Science (ELPH). Recently, two measurements from electron scattering and ordinary hydrogen spectroscopy were found to agree with the results from muonic atom spectroscopy. Proton Charge Radius by electron scattering under the lowest-ever momentum transfer. Since then, atomic and nuclear physicists have been trying to understand this discrepancy by checking theories, questioning experimental methods and performing new experiments. More recently, R has been extracted from the Lamb shift measured for muonic hydrogen. In 2010, a highly precise measurement of the proton charge radius using, for the first time, muonic hydrogen spectroscopy unexpectedly led to controversy, as the value disagreed with the previously accepted one. At the start of the 21 st century, dozens of results from both types of experiment were used by The Committee on Data for Science and Technology (CODATA) to establish a very precise figure for the proton’s radius: 0.8768 fm, give or take just 0.0069 fm. For nearly half a century the charge radius of the proton had been obtained from measurements of the energy levels of the hydrogen atom or by scattering. Traditionally, R has been obtained from data on elastic electron scattering on the proton. The proton charge radius has been measured since the 1950s using elastic electron–proton scattering and ordinary hydrogen atomic spectroscopy. ![]()
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