Glueballs and topology in lattice QCD with two light flavors
- Supercomputer Computations Research Institute, The Florida State University, Tallahassee, Florida (USA)
- Physics Department, University of Colorado, Boulder, Colorado (USA)
- Department of Physics, Indiana University, Bloomington, Indiana (USA)
- Department of Physics, University of Illinois, 1110 W. Green St., Urbana, Illinois (USA)
- Thinking Machines Corporation, Cambridge, Massachusetts (USA)
- Department of Physics, Washington University, St. Louis, Missouri (USA)
- High Energy Physics Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois (USA)
- Department of Physics, University of California, Santa Barbara, California (USA)
- All Souls College, Oxford (United Kingdom) Department of Theoretical Physics, University of Oxford, Oxford OX1 3NP
We obtain estimates of the lightest glueball masses, the string tension, and the topological susceptibility in an exploratory study of QCD with two light flavors of quarks. Our calculations are performed at {beta}=5.6 with staggered quark masses {ital m}{sub {ital q}}=0.010 and 0.025 and on lattices ranging from 12{sup 4} to 16{sup 4}. Our estimates suggest that, just as in the pure gauge theory, the 0{sup ++} is the lightest glueball with the 2{sup ++} about 50% heavier. Our {ital m}{sub {ital q}}=0.01 results predict a 0{sup ++} glueball mass of about 1.6 times the {rho} mass and the square root of the string tension of about 0.48 times the {rho} mass, which is surprisingly close to the usual phenomenologically motivated estimates of around 0.55. Our value of the topological susceptibility at {ital m}{sub {ital q}}=0.01 is consistent with the prediction, to {ital O}({ital m}{sub {ital q}}) of the standard anomalous Ward identity. However, the variation of this susceptibility between {ital m}{sub {ital q}}=0.01 and {ital m}{sub {ital q}}=0.025 is weaker than the linear dependence one expects at small {ital m}{sub {ital q}} in the broken-chiral-symmetry phase of QCD.
- OSTI ID:
- 5027042
- Journal Information:
- Physical Review, D (Particles Fields); (United States), Vol. 44:7; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LATTICE FIELD THEORY
QUANTUM CHROMODYNAMICS
GLUEBALLS
CHIRAL SYMMETRY
FLAVOR MODEL
GAUGE INVARIANCE
MASS
STRING MODELS
SU-2 GROUPS
SU-3 GROUPS
SYMMETRY BREAKING
TOPOLOGY
WARD IDENTITY
COMPOSITE MODELS
EXTENDED PARTICLE MODEL
FIELD THEORIES
INVARIANCE PRINCIPLES
LIE GROUPS
MATHEMATICAL MODELS
MATHEMATICS
PARTICLE MODELS
QUANTUM FIELD THEORY
QUARK MODEL
SU GROUPS
SYMMETRY
SYMMETRY GROUPS
645400* - High Energy Physics- Field Theory