High Energy Physics - Phenomenology
[Submitted on 31 Dec 2008 (v1), last revised 27 Jan 2009 (this version, v2)]
Title:Anomalies and chiral symmetry in QCD
View PDFAbstract: I review some aspects of the interplay between anomalies and chiral symmetry. The quantum anomaly that breaks the U(1) axial symmetry of massless QCD leaves behind a flavor-singlet discrete chiral invariance. When the mass is turned on this residual symmetry has a close connection with the strong CP violating parameter theta. One result is that a first order transition is usually expected when the strong CP violating angle passes through pi. This symmetry can be understood either in terms of effective chiral Lagrangians or in terms of the underlying quark fields.
Submission history
From: Michael Creutz [view email][v1] Wed, 31 Dec 2008 22:31:42 UTC (108 KB)
[v2] Tue, 27 Jan 2009 15:25:28 UTC (115 KB)
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