Enhanced Global Symmetries and a Strong Electroweak Sector
Abstract
Description
In this talk I review the intriguing possibility (see Reference[1]) that the physical spectrum of a vector-like gauge field theory exhibits an enhanced global symmetry near a chiral phase transition. A transition from the Goldstone phase to the symmetric phase is expected as the number of fermions Nf is increased to some critical value. Various investigations have suggested that a parity-doubled spectrum develops as the critical value is approached. Using an effective Lagrangian as a guide one observes that a parity doubling is associated with the appearance of an enhanced global symmetry in the spectrum of the theory. If such a near-critical theory describes symmetry breaking in the electroweak theory, the additional symmetry suppresses the contribution of the parity doubled sector to the S parameter.
Talk presented at the Cargese 99 School, "Beyond the Standard Model", Corse, France. 10 pages, RevTex
Talk presented at the Cargese 99 School, "Beyond the Standard Model", Corse, France. 10 pages, RevTex