Enhanced Global Symmetry Constraints on epsilon Terms

Z. Duan, P. S. Rodrigues da Silva, F. Sannino

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Abstrakt

Recently it has been proposed that the physical spectrum of a vector-like gauge field theory may exhibit an enhanced global symmetry near a chiral/conformal phase transition. The new symmetry is related to the possibility, supported by various investigations, that a parity-doubled spectrum develops as the number of fermions Nf is increased to a critical value above which it is expected that the symmetric phase is restored. We show that parity-doubling together with the associated enhanced global symmetry severely constrains the epsilon terms of the effective Lagrangian involving Goldstone bosons as well as massive spin-1 particles. We extend our analysis to underlying fermions in pseudo-real representations of the gauge group.
OriginalsprogEngelsk
TidsskriftPhysical Review D
Vol/bind592
Udgave nummer1-2
Sider (fra-til)371-390
ISSN2470-0010
DOI
StatusUdgivet - jan. 2001
Udgivet eksterntJa

Bibliografisk note

22 pages, RevTeX format. Appendix A added. Accepted in Nucl. Phys. B

Emneord

  • hep-ph
  • hep-th
  • nucl-th

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