We consider the standard model without the Higgs boson, where the Goldstone modes are described by a nonlinear sigma model. We study the renormalization group flow of the sigma model coupling f and of the electroweak parameters S and T. The condition that the couplings reach a fixed point at high energy leaves the low energy values of f and T arbitrary (to be determined experimentally) and fixes S to a value compatible with electroweak precision data.

Physical Review Letters
Ottawa-Carleton Institute for Physics

Fabbrichesi, M. (M.), Percacci, R. (R.), Tonero, A, & Vecchi, L. (L.). (2011). Electroweak S and T parameters from a fixed point condition. Physical Review Letters, 107(2). doi:10.1103/PhysRevLett.107.021803