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We describe a new method to determine non-perturbatively the beta function ofa gauge theory using lattice simulations in the p-regime of the theory. Thiscomplements alternative measurements of the beta function working directly atzero fermion mass and bridges the gap between the weak coupling perturbativeregime and the strong coupling regime relevant to the mass spectrum of thetheory. We apply this method to ${\mathrm {SU(3)} }$ gauge theory with twofermion flavors in the 2-index symmetric (sextet) representation. We find thatthe beta function is small but non-zero at the renormalized coupling value $g^2= 6.7$, consistent with our previous independent investigation usingsimulations directly at zero fermion mass. The model continues to be a veryinteresting explicit realization of the near-conformal composite Higgs paradigmwhich could be relevant for Beyond Standard Model phenomenology.

A new method for the beta function in the chiral symmetry broken phase