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arXiv · hep-ph/9912309

Enhanced Global Symmetries and a Strong Electroweak Sector

Francesco Sannino
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Abstract

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.

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Francesco Sannino. 1999-12-11. Enhanced Global Symmetries and a Strong Electroweak Sector. https://arxiv.org/abs/hep-ph/9912309

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