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Title: Mesonic spectroscopy of minimal walking technicolor

Abstract

We investigate the structure and the novel emerging features of the mesonic nonsinglet spectrum of the minimal walking technicolor theory. Precision measurements in the nonsinglet pseudoscalar and vector channels are compared to the expectations for an IR-conformal field theory and a QCD-like theory. Our results favor a scenario in which minimal walking technicolor is (almost) conformal in the infrared, while spontaneous chiral symmetry breaking seems less plausible.

Authors:
 [1]; ;  [2];  [3];  [4]
  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. CP3-Origins, University of Southern Denmark, Odense, 5230 M (Denmark)
  4. Department of Physics, Bergische Universitaet Wuppertal, Gaussstrasse 20, D-42119 Wuppertal (Germany)
Publication Date:
OSTI Identifier:
21410054
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 82; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.82.014509; (c) 2010 The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; CHIRAL SYMMETRY; COLOR MODEL; CONFORMAL INVARIANCE; MESON SPECTROSCOPY; QUANTUM CHROMODYNAMICS; QUANTUM FIELD THEORY; SPECTRA; SPECTROSCOPY; SYMMETRY BREAKING; COMPOSITE MODELS; FIELD THEORIES; INVARIANCE PRINCIPLES; MATHEMATICAL MODELS; PARTICLE MODELS; QUARK MODEL; SYMMETRY

Citation Formats

Del Debbio, Luigi, Lucini, Biagio, Patella, Agostino, Pica, Claudio, and Rago, Antonio. Mesonic spectroscopy of minimal walking technicolor. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.82.014509.
Del Debbio, Luigi, Lucini, Biagio, Patella, Agostino, Pica, Claudio, & Rago, Antonio. Mesonic spectroscopy of minimal walking technicolor. United States. doi:10.1103/PHYSREVD.82.014509.
Del Debbio, Luigi, Lucini, Biagio, Patella, Agostino, Pica, Claudio, and Rago, Antonio. 2010. "Mesonic spectroscopy of minimal walking technicolor". United States. doi:10.1103/PHYSREVD.82.014509.
@article{osti_21410054,
title = {Mesonic spectroscopy of minimal walking technicolor},
author = {Del Debbio, Luigi and Lucini, Biagio and Patella, Agostino and Pica, Claudio and Rago, Antonio},
abstractNote = {We investigate the structure and the novel emerging features of the mesonic nonsinglet spectrum of the minimal walking technicolor theory. Precision measurements in the nonsinglet pseudoscalar and vector channels are compared to the expectations for an IR-conformal field theory and a QCD-like theory. Our results favor a scenario in which minimal walking technicolor is (almost) conformal in the infrared, while spontaneous chiral symmetry breaking seems less plausible.},
doi = {10.1103/PHYSREVD.82.014509},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 82,
place = {United States},
year = 2010,
month = 7
}
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  • 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 themore » 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.« less
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