Higher-Loop Corrections to the Infrared Evolution of a Gauge Theory with Fermions

Thomas Ryttov, Robert Shrock

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Abstract

We consider a vectorial, asymptotically free gauge theory and analyze the effect of higher-loop corrections to the beta function on the evolution of the theory from the ultraviolet to the infrared. We study the case in which the theory contains $N_f$ copies of a fermion transforming according to the fundamental representation and several higher-dimensional representations of the gauge group. We also calculate higher-loop values of the anomalous dimension of the mass, $\gamma_m$ of $\bar\psi\psi$ at the infrared zero of the beta function. We find that for a given theory, the values of $\gamma_m$ calculated to three- and four-loop order, and evaluated at the infrared zero computed to the same order, tend to be somewhat smaller than the value calculated to two-loop order. The results are compared with recent lattice simulations.
Translated title of the contributionHigher-Loop Corrections to the Infrared Evolution of a Gauge Theory with Fermions
Original languageEnglish
JournalPhys.Rev.D
DOIs
Publication statusPublished - 20. Nov 2010
Externally publishedYes

Keywords

  • hep-ph

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