Anomalies and discrete chiral symmetries

Details Anomalies and discrete chiral symmetries Anomalies and discrete chiral symmetries

2009-09-28

arxiv.org/abs/0909.5101v2

PoS QCD-TNT09:008,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 7 figures. Contribution to the International Workshop on QCD Green's Functions, Confinement and Phenomenology Septem

Scientific paper

The quantum anomaly that breaks the U(1) axial symmetry of massless multi-flavored QCD leaves behind a discrete flavor-singlet chiral invariance. With massive quarks, this residual symmetry has a close connection with the strong CP-violating parameter theta. One result is that if the lightest quarks are degenerate, then a first order transition will occur when theta passes through pi. The resulting framework helps clarify when the rooting prescription for extrapolating in the number of flavors is valid.

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