https://doi.org/10.1007/s10050-000-5075-8
Nucleon magnetic moments in an extended chiral constituent quark model
1
Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, via Bassi 6, I27100, Pavia, Italy
2
INFN, Sezione di Pavia, via Bassi 6, I27100, Pavia, Italy
3
Institutes of Nuclear Physics, N.C.S.R. “Demokritos”, Aghia Paraskevi, GR-156 10, Athens, Greece
* e-mail: wagenbrunn@pv.infn.it
Received:
4
May
2000
Revised:
16
May
2000
Published online: 11 September 2013
We present results for the nucleon magnetic moments in the context of an extended chiral constituent quark model based on the mechanism of the Goldstone boson exchange, as suggested by the spontaneous breaking of chiral symmetry in QCD. The electromagnetic charge-current operator is consistently deduced from the model Hamiltonian, which includes all force components for the pseudoscalar, vector and scalar meson exchanges. Thus, the continuity equation is satisfied for each piece of the interaction, avoiding the introduction of any further parameter. A good agreement with experimental values is found. The role of isoscalar two-body operators, not constrained by the continuity equation, is also investigated.
PACS: 12.39.-x Phenomenological quark models – / 13.40.Em Electric and magnetic moments – / 14.20.Dh Protons and neutrons –
© Società Italiana di Fisica and Springer-Verlag, 2000
