Chiral perturbation theory of muonic-hydrogen Lamb shift: polarizability contribution

Alarcón, José Manuel; Lensky, Vadim; Pascalutsa, Vladimir

doi:10.1140/epjc/s10052-014-2852-0

Cited by 88 publications

(120 citation statements)

References 32 publications

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“…Improvements in the baryonic sector of chiral EFT are interesting, among other things, to unveil the low energy structure of the nucleon [4,[6][7][8] or for theoretical calculations where the hadronic interaction of the nucleon is relevant at low energies. A good example of the latter is the usefulness of baryon chiral EFT in the prediction of the contribution of the proton polarizabilities to the muonic hydrogen Lamb shift [21,22]. Therefore we consider it is worthy to apply the same approach to other fundamental nuclear processes where it has not been considered yet.…”

Section: Discussionmentioning

confidence: 99%

Improved description of the πN-scattering phenomenology in covariant baryon chiral perturbation theory

Alarcón

2014

EPJ Web of Conferences

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Abstract.We highlight some of the recent advances in the application of chiral effective field theory (chiral EFT) with baryons to the N scattering process. We recall some problems that cast doubt on the applicability of chiral EFT to N and show how the relativistic formalism, once the (1232)-resonance is included as an explicit degree of freedom, solves these issues. Finally it is shown how this approach can be used to extract the -terms from phenomenological information.

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Section: Discussionmentioning

confidence: 99%

Improved description of the πN-scattering phenomenology in covariant baryon chiral perturbation theory

Alarcón

2014

EPJ Web of Conferences

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“…The bigger contribution to E TPE comes from the Born terms; it is encoded in the 3rd Zemach moment [685] together with its recoil corrections. The Q 2 -dependent subtraction function that appears in the inelastic part can be determined from the magnetic polarisability in combination with low-energy expansions, chiral perturbation theory and perturbative QCD constraints [677,[686][687][688][689]. However, the resulting value for E TPE is too small to resolve the problem -to obtain a proton radius consistent with the CODATA value, the TPE contributions would have to be larger by an order of magnitude (requiring E TPE ∼ 0.360 meV).…”

Section: Overview Of Two-photon Physicsmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

421

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 discussion has focused on the one hand on recalculation of the theoretical input to the extraction of r p E from muonic hydrogen and on modifications of the theoretical calculation such as proton structure effects, e.g. [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,…”

Section: Introductionmentioning

confidence: 99%

Model independent extraction of the proton magnetic radius from electron scattering

2014

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We combine constraints from analyticity with experimental electron-proton scattering data to determine the proton magnetic radius without model-dependent assumptions on the shape of the form factor. We also study the impact of including electron-neutron scattering data, and ππ → NN data. Using representative datasets we find for a cut of Q 2 ≤ 0.5 GeV 2 , r p M = 0.91 +0.03 −0.06 ± 0.02 fm using just proton scattering data; r p M = 0.87 +0.04 −0.05 ± 0.01 fm adding neutron data; and r p M = 0.87 +0.02 −0.02 fm adding ππ data. We also extract the neutron magnetic radius from these data sets obtaining r n M = 0.89 +0.03 −0.03 fm from the combined proton, neutron, and ππ data.

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Chiral perturbation theory of muonic-hydrogen Lamb shift: polarizability contribution

Cited by 88 publications

References 32 publications

Improved description of the πN-scattering phenomenology in covariant baryon chiral perturbation theory

Improved description of the πN-scattering phenomenology in covariant baryon chiral perturbation theory

Baryons as relativistic three-quark bound states

Model independent extraction of the proton magnetic radius from electron scattering

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