Proton radius from electron scattering data

Higinbotham, D. W.; Kabir, A.; Lin, Vincent; Meekins, D.; Norum, B.; Sawatzky, B.

doi:10.1103/physrevc.93.055207

Cited by 77 publications

(93 citation statements)

References 35 publications

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“…= 0.408 (61) (48). nsic quark spin contribution agrees d set by a recent phenomenologiental data from COMPASS [45], 1 2 ∆⌃ < 0.18. The results for L q also consistent with an analysis of tributions [45].…”

supporting

confidence: 87%

“…nsic quark spin contribution agrees d set by a recent phenomenologiental data from COMPASS [45], 1 2 ∆⌃ < 0.18. The results for L q also consistent with an analysis of tributions [45]. Using the spin sum t J g = 1 2 J q =0.092(61)(48), which Centre (CSCS) under project IDs from the John von Neumann-Institu the Jureca and the BlueGene/Q Ju research center in Jülich from a Ga perMUC with ID 44060.…”

supporting

confidence: 85%

“…The charge radius of the proton is a fundamental quantity describing nucleon structure, and resolving the 7σ discrepancy between determinations of the radius from electron scattering experiments and electronic hydrogen spectroscopy on the one hand and measurements of muonic hydrogen [40,41] on the other-termed the 'proton radius puzzle'-is a high priority for the hadronic physics community [42][43][44][45][46]. In principle, the gluonic radius of the proton is no less important or interesting, and need not be the same, but it is completely unknown from experiment.…”

Section: D Gluon Structurementioning

confidence: 99%

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The gluon structure of hadrons and nuclei from lattice QCD

Shanahan

2018

EPJ Web Conf.

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Abstract. I discuss recent lattice QCD studies of the gluon structure of hadrons and light nuclei. After very briefly highlighting new determinations of the gluon contributions to the nucleon's momentum and spin, presented by several collaborations over the last year, I describe first calculations of gluon generalised form factors. The generalised transversity gluon distributions are of particular interest since they are purely gluonic; they do not mix with quark distributions at leading twist. In light nuclei they moreover provide a clean signature of non-nucleonic gluon degrees of freedom, and I present the first evidence for such effects, based on lattice QCD calculations. The planned ElectronIon Collider, designed to access gluon structure quantities, will have the capability to test this prediction, and measure a range of gluon observables including generalised gluon distributions and transverse momentum dependent gluon distributions, within the next decade.

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supporting

confidence: 87%

supporting

confidence: 85%

Section: D Gluon Structurementioning

confidence: 99%

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The gluon structure of hadrons and nuclei from lattice QCD

Shanahan

2018

EPJ Web Conf.

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“…The first point may seem obsolete in light of the available precise low-Q 2 electron scattering data which support the upper value for the proton radius [678]. It has been argued, however, that the data may be equally compatible with the smaller radius [679][680][681] although the issue is disputed [682]. In this respect, forthcoming data at extremely low Q 2 from the PRAD experiment at Jefferson Lab [683] may help to resolve the problem.…”

Section: Overview Of Two-photon Physicsmentioning

confidence: 90%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

406

530

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We review the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD. The composite nature of baryons results in a rich excitation spectrum, whilst leading to highly non-trivial structural properties explored by the coupling to external (electromagnetic and other) currents. Both present many unsolved problems despite decades of experimental and theoretical research. We discuss the progress in these fields from a theoretical perspective, focusing on nonperturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations. We give a systematic overview as to how results are obtained in this framework and explain technical connections to lattice QCD. We also discuss the mutual relations to the quark model, which still serves as a reference to distinguish 'expected' from 'unexpected' physics. We confront recent results on the spectrum of non-strange and strange baryons, their form factors and the issues of two-photon processes and Compton scattering determined in the DysonSchwinger framework with those of lattice QCD and the available experimental data. The general aim is to identify the underlying physical mechanisms behind the plethora of observable phenomena in terms of the underlying quark and gluon degrees of freedom.

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“…The determination of R p from electron-proton scattering data has been discussed extensively in the literature [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. The proton radius can be determined [24] from scattering data from…”

mentioning

confidence: 99%

Proton radius from electron-proton scattering and chiral perturbation theory

2017

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We determine the root-mean-square proton charge radius, R p , from a fit to low-Q 2 electronproton elastic-scattering cross-section data with the higher moments fixed (within uncertainties) to the values predicted by chiral perturbation theory. We obtain R p = 0.855 (11) fm. This number falls between the value obtained from muonic hydrogen analyses and the CODATA value (based upon atomic hydrogen spectroscopy and electron-proton scattering determinations).

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Proton radius from electron scattering data

Abstract: Background: The proton charge radius extracted from recent muonic hydrogen Lamb shift measurements is significantly smaller than that extracted from atomic hydrogen and electron scattering measurements. The discrepancy has become known as the proton radius puzzle.

Cited by 77 publications

References 35 publications

The gluon structure of hadrons and nuclei from lattice QCD

The gluon structure of hadrons and nuclei from lattice QCD

Baryons as relativistic three-quark bound states

Proton radius from electron-proton scattering and chiral perturbation theory

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