Quenched approximation in the quark model

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.41.1595· OSTI ID:7134273

Geiger, P; Isgur, N ^[1]

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1. Department of Physics, University of Toronto, Toronto, Canada M5S 1A7 (CA)

We present a model calculation of some effects of virtual {ital q{bar q}} pairs in mesons. Specifically, using a model for pair creation that has previously been shown to give a good description of strong meson decays, we calculate the energy shift of a static quark-antiquark pair due to the presence of virtual quark-antiquark pairs. The shift is large and approximately proportional to the distance between the static sources. The linearity of the correction suggests that pair-creation effects can be absorbed into a renormalization of the mesonic string tension. However, this masking can only be approximate, as we show by considering the dependence of the energy shift on the spin state of the sources. We conclude by pointing out the relevance of our results to the {ital N}/{rho}'' problem encountered in lattice QCD calculations.

• OSTI ID: 7134273
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 41:5; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645204 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COMPOSITE MODELS
DECAY
EIGENSTATES
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FIELD THEORIES
HADRONS
HAMILTONIANS
INTERACTIONS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
MESONS
PAIR PRODUCTION
PARTICLE MODELS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUANTUM OPERATORS
QUARK MODEL
QUARKONIUM
RENORMALIZATION
STRING MODELS
STRONG-COUPLING MODEL