Unitary isobar model --MAID2007

Drechsel, D.; Kamalov, S.S.; Tiator, L.

doi:10.1140/epja/i2007-10490-6

Cited by 544 publications

(968 citation statements)

References 58 publications

(105 reference statements)

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“…5(a)-5(c), the extracted beam asymmetry is plotted against the centre of mass polar angle in one energy bin for pπ 0 , and two energy bins for pη. Within the limited statistical accuracy, the data is consistent with the world data, represented here by the MAID PWA solution [5]. Higher statistics over a much greater kinematic range is expected soon in the PhD thesis of Andreas Bella [6].…”

Section: Linearly Polarised Photon Beamssupporting

confidence: 67%

Polarised Photon Beams for the BGO-OD Experiment at ELSA

Zimmermann¹,

Bella²,

Alef³

et al. 2016

Proceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)

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Section: Linearly Polarised Photon Beamssupporting

confidence: 67%

Polarised Photon Beams for the BGO-OD Experiment at ELSA

Zimmermann¹,

Bella²,

Alef³

et al. 2016

Proceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)

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“…3.6. [29] and the curves are the MAID parametrizations [30]. The triangles at the real photon point are the PDG values [9].…”

Section: Nucleon Resonancesmentioning

confidence: 99%

“…The multipole amplitudes are linear combinations of the transverse partial wave helicity amplitudes, which at the resonance locations are related to the N γ * → N * helicity amplitudes (see e.g. [11,13,30] for the explicit formulas).…”

Section: (24)mentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

418

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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“…Vector properties of baryons are coming directly from the MAID analysis [7], whereas their axial excitation current is modeled using a dipole form factor with axial coupling strength following the off-diagonal Goldberger-Treiman relation [23]. The only exception is the better understood ∆(1232) resonance with axial form factors fitted to ANL/BNL data.…”

Section: Resonant Pion Production In Gibuumentioning

confidence: 99%

“…Here the RES process is chosen to be the main example. In MC generators resonant pion production is either based upon the Rein-Sehgal paper [5] (continuation of the earlier quark Feynman-Kislinger-Ravndal model [6]) or on a variety of isobar models (see e. g. [7]). Another group of more sophisticated models (see e. g. [8], [9], [10], [11], [12], [13]) is still waiting to be implemented in MC generators.…”

Section: Introductionmentioning

confidence: 99%