On the strange vector form factors of the nucleon in the NJL soliton model

Weigel, H.; Abada, Abdellatif; Alkofer, Reinhard; Reinhardt, Hugo

doi:10.1016/0370-2693(95)00534-r

Cited by 60 publications

(42 citation statements)

References 44 publications

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“…Several models have been constructed in this spirit to implement the coupling of quarks to the pion and applied to nucleon form factors, from the cloudy bag model [550][551][552], the chiral quark models of Refs. [553][554][555][556], the chiral quark soliton model [348,[557][558][559], and the light-front quark-diquark model of Ref. [560].…”

Section: B Kinematics Andmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

438

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: B Kinematics Andmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

438

530

View full text Add to dashboard Cite

show abstract

“…The study of the matrix element N|sγ µ s|N in various three flavor soliton models will be reviewed in the present article. Such computations have been performed in the Skyrme model [38], the Skyrme model with vector mesons [40] and the NJL soliton approach [41]. Although these explorations will be discussed in detail later it is appropriate to mention that incorporating flavor symmetry breaking into the nucleon wave-function reduces the effect of strangeness.…”

Section: Strangeness In the Nucleonmentioning

confidence: 99%

“…Therefore the partial differential equations simplify considerably to a set of ordinary coupled differential equations in the angle ν when an appropriate parametrization for the baryon wave function is adopted (A.8). This finally yields the mass formula 41) where J denotes the spin of the baryon B and ǫ SB is the eigenvalue of…”

Section: Quantization Of the Collective Coordinatesmentioning

confidence: 99%

“…These form factors have been estimated in various models. They range from vector-meson-pole fits [36] of dispersion relations [37] through vector meson dominance approaches [38] and kaon-loop calculations with [34] and without [72] vector meson dominance contributions to soliton model calculations [38,40,41] S . In order to evaluate these objects in the three flavor Skyrme model one requires the matrix elements of the "strange" combination…”

Section: )mentioning

confidence: 99%

“…The resulting predictions [41] on the nucleon matrix element of the strange vector current have already been presented in table 4.3.…”

Section: 1mentioning

confidence: 99%

See 2 more Smart Citations

Baryons as Three-Flavor Solitons

Weigel

1996

Int. J. Mod. Phys. A

139

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The description of baryons as soliton solutions of effective meson theories for three flavor (up, down, strange) degrees of freedom is reviewed and the phenomenological implications are illuminated. In the collective approach the soliton configuration is equipped with baryon quantum numbers by canonical quantization of the coordinates describing the flavor orientation. The baryon spectrum resulting from exact diagonalization of the collective Hamiltonian is discussed. The prediction of static properties such as the baryon magnetic moments and the Cabibbo matrix elements for semi-leptonic hyperon decays are explored with regard to the influence of flavor symmetry breaking. In particular, the role of strange degrees of freedom in the nucleon is investigated for both the vector and axial-vector current matrix elements. The latter are discussed extensively within in the context of the proton spin puzzle. The influence of flavor symmetry breaking on the shape of the soliton is examined and observed to cause significant deviations from flavor covariant predictions on the baryon magnetic moments. Short range effects are incorporated by a chiral invariant inclusion of vector meson fields. These extensions are necessary to properly describe the singlet axial-vector current and the neutron proton mass difference. The effects of the vector meson excitations on baryon properties are also considered. The bound state description of hyperons and its generalization to baryons containing a heavy quark are illustrated. In the case of the Skyrme model a comparison is performed between the collective quantization scheme and bound state approach. Finally, the Nambu-Jona-Lasinio model is employed to demonstrate that hyperons can be described as solitons in a microscopic theory of the quark flavor dynamics. This is explained for both the collective and the bound state approaches to strangeness.2

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Parity violating electron scattering at the MAMI facility in Mainz

Maas

2005

From Parity Violation to Hadronic Structure and More

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Abstract.A measurement of the weak form factor of the proton allows a separation of the strangeness contribution to the electromagnetic form factors. The weak form factor is accessed experimentally by the measurement of a parity violating (PV) asymmetry in the scattering of polarized electrons on unpolarized protons. We performed such measurements with the setup of the A4-experiment at the MAMI accelerator facility in Mainz. The role of strangeness in low energy nonperturbative QCD is discussed. The A4-experiment is presented as well as the results on the strangeness form factors which have been measured at two Q 2 -values. The plans for backward angle measurements at the MAMI facility are presented.

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On the strange vector form factors of the nucleon in the NJL soliton model

Cited by 60 publications

References 44 publications

Baryons as relativistic three-quark bound states

Baryons as relativistic three-quark bound states

Baryons as Three-Flavor Solitons

Parity violating electron scattering at the MAMI facility in Mainz

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