Baryon Spin and Magnetic Moments in Relativistic Chiral Quark Models

The spin and flavor fractions of constituent quarks in the baryon octet are obtained from their lowest order chiral fluctuations involving Goldstone bosons. SU(3) breaking suggested by the mass difference between the strange and up, down quarks is included, as are relativistic effects by means of a light-cone quark model for the proton, and the gluon contribution from the axial anomaly in the singlet channel. Magnetic moments from the Karl-Sehgal formulas are analyzed in this framework as well.

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Magnetic moments of the nucleon octet in a relativistic light-cone quark model

Physics Letters B ◽

10.1016/0370-2693(88)90167-0 ◽

1988 ◽

Vol 200 (4) ◽

pp. 539-542 ◽

Cited By ~ 9

Author(s):

Zbigniew Dziembowski ◽

Tomasz Dzurak ◽

Adam Szczepaniak ◽

Lech Mankiewicz

Keyword(s):

Quark Model ◽

Light Cone ◽

Magnetic Moments

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Relativistic Bound States

Australian Journal of Physics ◽

10.1071/ph910149 ◽

1991 ◽

Vol 44 (3) ◽

pp. 149 ◽

Cited By ~ 1

Author(s):

BHJ McKellar

Keyword(s):

Quark Model ◽

Uncertainty Principle ◽

Light Cone ◽

Bound States ◽

Relativistic Effects ◽

Relativistic Dynamics ◽

Hadronic Structure ◽

Quark Structure ◽

Relativistic Bound States

The standard resul ts of the quark model rely on nonrelativistic descriptions of the wavefunctions of the quarks in the hadron. However, simple uncertainty principle considerations show that the momenta of the quarks are comparable to their (constituent) masses, so that relativistic dynamics must be used in the description of the hadronic structure. In this paper I describe a number of new and old results which illustrate relativistic effects on the quark structure of hardons, and which employ the method of light cone quantisation to handle relativity.

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Proton Spin in Chiral Quark Models

Modern Physics Letters A ◽

10.1142/s0217732397000765 ◽

1997 ◽

Vol 12 (10) ◽

pp. 729-736 ◽

Cited By ~ 10

Author(s):

H. J. Weber ◽

X. Song ◽

M. Kirchbach

Keyword(s):

Mass Difference ◽

Proton Spin ◽

Goldstone Bosons ◽

Quark Models

The spin and flavor fractions of constituent quarks in the proton are obtained from their chiral fluctuations involving Goldstone bosons. SU(3) breaking suggested by the mass difference between the strange and up, down quarks is included, and this improves the agreement with the data markedly.

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SUBSTRUCTURE EFFECT ON ρ-ω MIXING IN CHARGE-SYMMETRY VIOLATION

Modern Physics Letters A ◽

10.1142/s0217732392002421 ◽

1992 ◽

Vol 07 (32) ◽

pp. 3037-3043 ◽

Cited By ~ 13

Author(s):

T. GOLDMAN ◽

J.A. HENDERSON ◽

A.W. THOMAS

Keyword(s):

Symmetry Breaking ◽

Quark Model ◽

Quark Mass ◽

Mass Shell ◽

Mass Difference ◽

Charge Symmetry Breaking ◽

Symmetry Violation ◽

Charge Symmetry ◽

A Charge ◽

Simple Quark Model

In generating a charge-symmetry breaking potential using ρ-ω mixing it is usually assumed that the mixing amplitude is constant (at the on-mass-shell value). Since the exchanged meson is actually far off-shell one must question the validity of this assumption. By constructing a simple quark model in which the mixing is generated by the u-d quark mass difference, we find that the assumption seems to be a very poor one.

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