The proton radius: from a puzzle to precision

Hammer, H.-W.; Meißner, Ulf‐G.

doi:10.1016/j.scib.2019.12.012

Cited by 54 publications

(44 citation statements)

References 33 publications

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“…The indicated range for the HBChPT result corresponds with the range given by Eq. (15) in Ref. [17].…”

Section: Doubly Virtual Compton Scatteringmentioning

confidence: 99%

“…With the next generation of high-precision experiments both in scattering and spectroscopy, the focus is now shifting to improve the precision on this fundamental nucleon structure quantity, as spelled out recently in Ref. [15]. Indeed, to extract the proton charge radius from μH Lamb shift measurements, which is at present the most precise method, the proton form factors, structure functions, and polarizabilities are all required as input in a quantitative understanding of the hadronic correction [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Low-energy doubly virtual Compton scattering from dilepton electroproduction on a nucleon

2020

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We propose a new way to experimentally determine the subleading low-energy structure constant of doubly virtual Compton scattering on a proton. Such empirical determination will reduce the theoretical model error in estimates of the hadronic correction to the muonic hydrogen Lamb shift. We demonstrate that the dilepton forward-backward asymmetry in the e − p → e − p e − e + process, which can be accessed at electron scattering facilities, yields a large sensitivity to this so far unknown low-energy constant.

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“…The indicated range for the HBChPT result corresponds with the range given by Eq. (15) in Ref. [17].…”

Section: Doubly Virtual Compton Scatteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-energy doubly virtual Compton scattering from dilepton electroproduction on a nucleon

2020

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“…We do not include external constraints on r p M or r n M . We have not included dispersive constraints [11,12,87,88] on the form factors such as from ππ → NN data, since these constraints have either modest impact on the fits [14] or introduce further theoretical considerations. Our form factor results are presented with complete error budgets that may be compared to other determinations using dispersive analysis, lattice QCD, or future electron scattering data.…”

Section: B Data Selectionmentioning

confidence: 99%

“…not incorporate the low-Q 2 constraint on the proton electric form factor that emerges from muonic atom spectroscopy. While there is not a complete consensus regarding the resolution of the so-called proton radius puzzle [8][9][10][11][12], we believe it is important to be able to consistently incorporate these data and study their impact for applications such as neutrino scattering.…”

Section: Introductionmentioning

confidence: 99%

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Parametrization and applications of the low- Q2 nucleon vector form factors

et al. 2020

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We present the proton and neutron vector form factors in a convenient parametric form that is optimized for momentum transfers ≲ few GeV 2. The form factors are determined from a global fit to electron scattering data and precise charge radius measurements. A new treatment of radiative corrections is applied. This parametric representation of the form factors, uncertainties, and correlations provides an efficient means to evaluate many derived observables. We consider two classes of illustrative examples: neutrinonucleon scattering cross sections at GeV energies for neutrino oscillation experiments and nucleon structure corrections for atomic spectroscopy. The neutrino-nucleon charged current quasielastic cross section differs by 3%-5% compared to commonly used form factor models when the vector form factors are constrained by recent high-statistics electron-proton scattering data from the A1 Collaboration. Nucleon structure parameter determinations include: the magnetic and Zemach radii of the proton and neutron, ½r p M ; r n M ¼ ½0.739ð41Þð23Þ; 0.776ð53Þð28Þ fm and ½r p Z ; r n Z ¼ ½1.0227ð94Þð51Þ; −0.0445ð14Þð3Þ fm; the Friar radius of nucleons, ½ðr p F Þ 3 ; ðr n F Þ 3 ¼ ½2.246ð58Þð2Þ; 0.0093ð6Þð1Þ fm 3 ; the electric curvatures, ½hr 4 i p E ; hr 4 i n E ¼ ½1.08ð28Þð5Þ; −0.33ð24Þð3Þ fm 4 ; and bounds on the magnetic curvatures, ½hr 4 i p M ; hr 4 i n M ¼ ½−2.0ð1.7Þð0.8Þ; −2.3ð2.1Þð1.1Þ fm 4. The first and dominant uncertainty is propagated from the experimental data and radiative corrections, and the second error is due to the fitting procedure.

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Hyperon Physics with BESIII

Schoenning

2022

Few-Body Syst

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Hyperons constitute a unique diagnostic tool to shed light on various unresolved puzzles in contemporary physics. Prominent examples are the matter–antimatter asymmetry of the universe and how the strong interaction confines quarks into hadrons. The weak, parity violating decay of hyperons make their spin properties experimentally accessible. This can be exploited e.g. in searches for CP violation and in the decomposition of the inner, electromagnetic structure of hyperons. The BESIII experiment at BEPC-II, Beijing, China is excellently suited for hyperon physics. Recently collected large data samples have been analysed and a plethora of new results have emerged. In these proceedings, we discuss the virtues of polarised and entangled hyperons, and present a collection of recent results from BESIII.

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The proton radius: from a puzzle to precision

Abstract: We comment on the status and history of the proton charge radius determinations.

Cited by 54 publications

References 33 publications

Low-energy doubly virtual Compton scattering from dilepton electroproduction on a nucleon

Low-energy doubly virtual Compton scattering from dilepton electroproduction on a nucleon

Parametrization and applications of the low- Q2 nucleon vector form factors

Hyperon Physics with BESIII

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