Scheme-Independent Calculations of Properties at a Conformal Infrared Fixed Point in Gauge Theories with Multiple Fermion Representations

TL;DR

This paper extends scheme-independent calculations of operator properties at conformal fixed points to gauge theories with multiple fermion representations, providing new insights into their anomalous dimensions and beta function derivatives.

Contribution

It generalizes previous scheme-independent analyses to theories with multiple fermion representations, specifically calculating anomalous dimensions and beta function derivatives at the IR fixed point.

Findings

Calculated anomalous dimensions of fermion bilinear operators.

Determined the derivative of the beta function at the fixed point.

Applied results to SU(N_c) theories with fundamental and adjoint fermions.

Abstract

In previous work we have presented scheme-independent calculations of physical properties of operators at a conformally invariant infrared fixed point in an asymptotically free gauge theory with gauge group $G$ and $N_f$ fermions in a representation $R$ of $G$. Here we generalize this analysis to the case of fermions in multiple representations, focusing on the case of two different representations. Our results include the calculation of the anomalous dimensions of gauge-invariant fermion bilinear operators, and the derivative of the beta function, evaluated at the infrared fixed point. We illustrate our results in an SU($N_c$) gauge theory with $N_F$ fermions in the fundamental representation and $N_{Adj}$ fermions in the adjoint representation.