Quark-gluon vertex model and lattice-QCD data

Journal Article · Mon Nov 01 00:00:00 EST 2004 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.70.094039· OSTI ID:20705633

Bhagwat, M S; Tandy, P C ^[1]

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1. Center for Nuclear Research, Department of Physics, Kent State University, Kent, Ohio 44242 (United States)

A model for the dressed-quark-gluon vertex, at zero gluon momentum, is formed from a nonperturbative extension of the two Feynman diagrams that contribute at one loop in perturbation theory. The required input is an existing ladder-rainbow model Bethe-Salpeter kernel from an approach based on the Dyson-Schwinger equations; no new parameters are introduced. The model includes an Ansatz for the triple-gluon vertex. Two of the three vertex amplitudes from the model provide a pointwise description of the recent quenched-lattice-QCD data. An estimate of the effects of quenching is made.

• OSTI ID: 20705633
• Journal Information: Physical Review. D, Particles Fields, Vol. 70, Issue 9; Other Information: DOI: 10.1103/PhysRevD.70.094039; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
BETHE-SALPETER EQUATION
FEYNMAN DIAGRAM
GAUGE INVARIANCE
GLUONS
KERNELS
LATTICE FIELD THEORY
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUARKS
QUENCHING
SCHWINGER SOURCE THEORY