Measurement of the Σ− charge radius by Σ−–electron elastic scattering

Eschrich, I.; Krüger, H.; Simon, J.; Vorwalter, K.; Alkhazov, G.; Atamantchouk, A. G.; Balatz, M.Y.; Bondar, N.; Cooper, P. S.; Dauwe, L. J.; Davidenko, G.V.; Dersch, U.; Dirkes, G.; Dolgolenko, A.; Dzyubenko, G.B.; Edelstein, R. M.; Emediato, L.; Endler, A. M. F.; Engelfried, J.; Escobar, C.; Evdokimov, A.; Филимонов, И. С.; García, F.; Gaspero, M.; Giller, I.; Golovtsov, V.; Gouffon, P.; Gülmez, E.; He, Kai; Iori, M.; Jun, S. Y.; Kaya, M.; Kilmer, J.; Kim, V.T; Kochenda, L.; Königsmann, K.; Konorov, I.; Кожевников, А. П.; Krivshich, A.; Kubantsev, M.; Kubarovsky, V.; Kulyavtsev, A. I.; Kuropatkin, N.P.; Kurshetsov, V. F.; Kushnirenko, A.; Kwan, S.; Lach, J.; Lamberto, A.; Landsberg, L.G.; Larin, I.; Leikin, E.M.; Li, Yun-Shan; Luksys, M.; Lungov, T.; Maleev, V. P.; Mao, Dan; Mao, Chensheng; Zhenlin, Mao; Masciocchi, S.; Mathew, P.; Mattson, M. E.; Matveev, V.; McCliment, E.; Moinester, M. A.; Molchanov, V. V.; Morelos, A.; Nelson, K. D.; Nemitkin, A.V.; Neoustroev, P. V.; Newsom, C. R.; Nilov, A. P.; Nurushev, S. B.; Ocherashvili, A.; Onel, Y.; Ozel, E.; Özkorucuklu, S.; Penzo, A.; Petrenko, S. V.; Pogodin, P.; Povh, Bogdan; Procario, M.; Prutskoi, V. A.; Ramberg, E.; Rappazzo, G. F.; Razmyslovich, B. V.; Ruď, V. I.; Russ, J.; Scheglov, Y.; Schiavon, P.; Ситников, А. И.; Skow, D.; Smith, V. J.; Srivastava, M. K.; Steiner, V.; Stepanov, V. V.; Stutte, L.; Svoiski, M.; Terentyev, N.; Thomas, G.; Uvarov, L. N.; Vasiliev, A. N.; Vavilov, D. V.; Verebryusov, V.S.; Victorov, V.A.; Vishnyakov, V.E.; Vorobyov, A. A.; You, J. M.; Wenheng, Zhao; Zheng, Sining; Funchal, R. Zukanovich

doi:10.1016/s0370-2693(01)01285-0

Cited by 63 publications

(51 citation statements)

References 15 publications

(13 reference statements)

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“…[643] for a compilation). Therefore, fitting theory to experiment allows one to extract the proton charge radius R E = 0.84087 (39). Its value is an order of magnitude more precise than the one obtained with electron measurements, but it is also by 7σ smaller than the CODATA value -hence the proton radius puzzle.…”

Section: Overview Of Two-photon Physicsmentioning

confidence: 89%

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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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Section: Overview Of Two-photon Physicsmentioning

confidence: 89%

“…While there is abundant experimental information on nucleon electromagnetic structure, our experimental knowledge of hyperons is limited to their static properties [39][40][41][42]. First measurements of hyperon form factors at large timelike photon momenta have been recently presented by the CLEO collaboration [43].…”

Section: Nucleon Resonancesmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

406

530

View full text Add to dashboard Cite

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“…The results for the electric charge squared radii and the magnetic squared radii are, respectively, presented in Tables VI and VII (see columns hr 2 E i and hr [51,[66][67][68][69][70][71] are also included in Table VI for …”

Section: E Electric Charge and Magnetic Dipole Radiimentioning

confidence: 99%

Octet baryon electromagnetic form factors in a relativistic quark model

Ramalho

Tsushima

2011

Phys. Rev. D

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Octet baryon electromagnetic form factors in a relativistic quark model We study the octet baryon electromagnetic properties by applying the covariant spectator quark model, and provide covariant parametrization that can be used to study baryon electromagnetic reactions. While we use the lattice QCD data in the large pion mass regime (small pion cloud effects) to determine the parameters of the model in the valence quark sector, we use the nucleon physical and octet baryon magnetic moment data to parametrize the pion cloud contributions. The valence quark contributions for the octet baryon electromagnetic form factors are estimated by extrapolating the lattice parametrization in the large pion mass regime to the physical regime. As for the pion cloud contributions, we parametrize them in a covariant, phenomenological manner, combined with SU(3) symmetry. We also discuss the impact of the pion cloud effects on the octet baryon electromagnetic form factors and their radii.

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“…The composite structure of hadronic bound states is encoded in their form factors. While there is abundant experimental information on the nucleon electromagnetic structure [1,2], our experimental knowledge of the structure of other baryons and, in particular, of those with strange-quark content (hyperons) is scarce and limited to some values for static properties [3][4][5][6][7]. First measurements of hyperon form factors at large time-like photon momentum have been presented recently by the CLEO collaboration [8].…”

Section: Introductionmentioning

confidence: 99%

Hyperon elastic electromagnetic form factors in the space-like momentum region

Sanchis-Alepuz

Fischer

2016

Eur. Phys. J. A

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Abstract. We present a calculation of the electric and magnetic form factors of ground-state octet and decuplet baryons including strange quarks. We work with a combination of Dyson-Schwinger equations for the quark propagator and covariant Bethe-Salpeter equations describing baryons as bound states of three (non-perturbative) quarks. Our form factors for the octet baryons are in good agreement with corresponding lattice data at finite Q 2 ; deviations in some isospin channels for the magnetic moments can be explained by missing meson cloud effects. At larger Q 2 our quark core calculation has predictive power for both, the octet and decuplet baryons.

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Measurement of the Σ− charge radius by Σ−–electron elastic scattering

Cited by 63 publications

References 15 publications

Baryons as relativistic three-quark bound states

Baryons as relativistic three-quark bound states

Octet baryon electromagnetic form factors in a relativistic quark model

Hyperon elastic electromagnetic form factors in the space-like momentum region

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