Infrared dynamics of minimal walking technicolor

Journal Article · Thu Jul 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.014510· OSTI ID:21410055

Del Debbio, Luigi ^[1]; Lucini, Biagio; Patella, Agostino ^[2]; Pica, Claudio ^[3]; Rago, Antonio ^[4]

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1. SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, Scotland (United Kingdom)
2. School of Physical Sciences, Swansea University, Singleton Park, Swansea SA2 8PP (United Kingdom)
3. CP-Origins, University of Southern Denmark, Odense, 5230 M (Denmark)
4. Department of Physics, Bergische Universitaet Wuppertal, Gaussstrasse 20, D-42119 Wuppertal (Germany)

We study the gauge sector of minimal walking technicolor, which is an SU(2) gauge theory with n{sub f}=2 flavors of Wilson fermions in the adjoint representation. Numerical simulations are performed on lattices N{sub t}xN{sub s}{sup 3}, with N{sub s} ranging from 8 to 16 and N{sub t}=2N{sub s}, at fixed {beta}=2.25, and varying the fermion bare mass m{sub 0}, so that our numerical results cover the full range of fermion masses from the quenched region to the chiral limit. We present results for the string tension and the glueball spectrum. A comparison of mesonic and gluonic observables leads to the conclusion that the infrared dynamics is given by an SU(2) pure Yang-Mills theory with a typical energy scale for the spectrum sliding to zero with the fermion mass. The typical mesonic mass scale is proportional to and much larger than this gluonic scale. Our findings are compatible with a scenario in which the massless theory is conformal in the infrared. An analysis of the scaling of the string tension with the fermion mass toward the massless limit allows us to extract the chiral condensate anomalous dimension {gamma}{sub *}, which is found to be {gamma}{sub *}=0.22{+-}0.06.

• OSTI ID: 21410055
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 1; Other Information: DOI: 10.1103/PhysRevD.82.014510; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANOMALOUS DIMENSION
CHIRALITY
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CONDENSATES
FERMIONS
FLAVOR MODEL
GAUGE INVARIANCE
GLUEBALLS
MASS
MESONS
SCALING
SPECTRA
SU-2 GROUPS
YANG-MILLS THEORY
BOSONS
COMPOSITE MODELS
ELEMENTARY PARTICLES
EVALUATION
HADRONS
INVARIANCE PRINCIPLES
LIE GROUPS
MATHEMATICAL MODELS
PARTICLE MODELS
PARTICLE PROPERTIES
QUARK MODEL
SCALE DIMENSION
SIMULATION
SU GROUPS
SYMMETRY GROUPS