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We examine the possibility that the physical spectrum of a vector-like gaugefield theory exhibits an enhanced global symmetry near a chiral phasetransition. A transition from the Goldstone phase to the symmetric phase isexpected as the number of fermions N_f is increased to some critical value.Various investigations have suggested that a parity-doubled spectrum developsas the critical value is approached. Using an effective Lagrangian as a guide,we note that parity doubling is associated with the appearance of an enhancedglobal symmetry in the spectrum of the theory. The enhanced symmetry woulddevelop as the spectrum splits into two sectors, with the first exhibiting theusual pattern of a spontaneously broken chiral symmetry, and the secondexhibiting an additional, unbroken symmetry and parity doubling. The firstsector includes the Goldstone bosons and other states such as massive scalarpartners. The second includes a parity-degenerate vector and axial vector alongwith other possible parity partners. We note that if such a near-criticaltheory describes symmetry breaking in the electroweak theory, the additionalsymmetry suppresses the contribution of the parity doubled sector to the Sparameter.Comment: Added references. 20 pages, RevTex format. To Appear in Phys. Rev.

Enhanced global symmetries and the chiral phase transition