Extended Goldstone-boson-exchange constituent-quark model

Glantschnig, Kathrin; Kainhofer, Reinhold; Plessas, W.; Sengl, B.; Wagenbrunn, R. F.

doi:10.1140/epja/i2004-10106-9

Cited by 20 publications

(24 citation statements)

References 29 publications

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“…For hyperons this is not the case, and thus one has to conclude that, if the picture of mutually interacting constituents quarks is a good description of reality, these interactions are flavour dependent. In particular, such interactions can be motivated as instanton-induced forces [133][134][135], or spin-spin forces via one-boson exchange [22,136,137].…”

Section: The Quark Modelmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

436

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: The Quark Modelmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

436

530

View full text Add to dashboard Cite

show abstract

“…The relativistic results calculated with the EGBE RCQM are compared to the ones by the other two types of RCQMs considered here, namely the psGBE as well as OGE RCQMs. At this instance, we regard the EGBE result as the most advanced one, as this particular RCQM includes all force components generated by GBE dynamics into the hyperfine interaction [20]. However, it is seen that also the psGBE RCQM, which relies only on a spin-spin hyperfine interaction, performs similarly well for all positive-parity resonances and for most of the negative-parity resonances; only for the J P = 3 2 − states N * (1520) and N * (1700) there occur differences, which have evidently to be attributed to tensor and/or spin-orbit forces.…”

Section: Resultsmentioning

confidence: 99%

“…The axial current operator is chosen according to the spectator model (SM) [19]. For the RCQM we employed in the first instance the extended Goldstone-bosonexchange (EGBE) RCQM [20], as it is supposed to produce the most elaborate nucleon and N * wave functions, but we also compare to predictions from the pseudoscalar Goldstone-boson-exchange (psGBE) [21,22] as well as the one-gluon-exchange (OGE) [23] RCQMs.…”

Section: Introductionmentioning

confidence: 99%

Quark-Model Predictions for Axial Charges of Nucleon andN* Resonances

Choi

Plessas

Wagenbrunn

2010

EPJ Web of Conferences

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Abstract.We have investigated the axial charges of the nucleon and N * resonances in a relativistic framework. Besides the axial charge of the nucleon, first predictions are reported for the axial charges of all well-established N * resonances below ∼1.9 GeV as produced by the relativistic constituent quark models relying on Goldstoneboson-exchange and one-gluon-exchange hyperfine interactions. The results for the axial charge of the nucleon are found close to experiment but with somewhat smaller values, similar to modern findings from quantum chromodynamics on the lattice. The predictions of the axial charges of the negative-parity N * (1535) and N * (1650) resonances also agree with what has most recently become available from lattice calculations. We discuss the roles of the axial charges of the N * resonances for the phenomenon of chiral-symmetry restoration possibly occurring in the higher hadron spectra.

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“…The splittings within multiplets are then provided by the spin and isospin dependence of the pseudoscalar meson exchange. The model has been extended to include also scalar and vector meson exchange [19]. Of course, both π and ρ exchange lead to tensor forces and therefore to a possible deformation of the nucleon and of the ∆ resonance.…”

Section: Constituent Quark Modelsmentioning

confidence: 99%

Quark Model Calculations of the N to Delta Reaction

Giannini¹

2007

AIP Conference Proceedings

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The electromagnetic excitation of the nucleon resonances is studied in the framework of Constituent Quark Models. Particular attention is devoted to the transition to the ∆ resonance and to the issue of a possible deformation of hadronic systems, mainly in connection with the problem of the quadrupole excitation. The analysis of the emerging discrepancies between data and theoretical predictions is discussed and shown to lead to important conclusions concerning the internal dynamical structure of hadrons.

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Extended Goldstone-boson-exchange constituent-quark model

Cited by 20 publications

References 29 publications

Baryons as relativistic three-quark bound states

Baryons as relativistic three-quark bound states

Quark-Model Predictions for Axial Charges of Nucleon andN* Resonances

Quark Model Calculations of the N to Delta Reaction

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