Effective field theory and the quark model
Journal Article
·
· Physical Review D
We analyze the connections between the quark model (QM) and the description of hadrons in the low-momentum limit of heavy-baryon effective field theory in QCD. By using a three-flavor-index representation for the effective baryon fields, we show that the {open_quotes}nonrelativistic{close_quotes} constituent QM for baryon masses and moments is completely equivalent through O(m{sub s}) to a parametrization of the relativistic field theory in a general spin-flavor basis. The flavor and spin variables can be identified with those of effective valence quarks. Conversely, the spin-flavor description clarifies the structure and dynamical interpretation of the chiral expansion in effective field theory, and provides a direct connection between the field theory and the semirelativistic models for hadrons used in successful dynamical calculations. This allows dynamical information to be incorporated directly into the chiral expansion. We find, for example, that the striking success of the additive QM for baryon magnetic moments is a consequence of the relative smallness of the non-additive spin-dependent corrections.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40204432
- Journal Information:
- Physical Review D, Journal Name: Physical Review D Journal Issue: 1 Vol. 64; ISSN 0556-2821
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magnetic moments of heavy baryons in the relativistic three-quark model
Relation of constituent quark models to QCD: Why several simple models work {open_quote}{open_quote}so well{close_quote}{close_quote}
Scalar sea contributions to spin 1/2 baryon structure and magnetic moments
Journal Article
·
Mon May 01 00:00:00 EDT 2006
· Physical Review. D, Particles Fields
·
OSTI ID:20782988
Relation of constituent quark models to QCD: Why several simple models work {open_quote}{open_quote}so well{close_quote}{close_quote}
Journal Article
·
Sun Mar 31 23:00:00 EST 1996
· Physical Review, D
·
OSTI ID:279841
Scalar sea contributions to spin 1/2 baryon structure and magnetic moments
Journal Article
·
Wed Jan 31 23:00:00 EST 1996
· AIP Conference Proceedings
·
OSTI ID:397185