The Measure of Strong CP Violation

Details The Measure of Strong CP Violation The Measure of Strong CP Violation

1992-09-14

arxiv.org/abs/hep-ph/9209235v1

Phys.Rev.D48:270-282,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

37 pages in LateX, SFU-Preprint-92-8

Scientific paper

10.1103/PhysRevD.48.270

We investigate a controversial issue on the measure of CP violation in strong in teractions. In the presence of nontrivial topological gauge configurations, the $\theta$-term in QCD has a profound effect: it breaks the CP symmetry. The CP-violating amplitude is shown to be determined by the vacuum tunneling process, where the semiclassical method makes most sense. We discuss a long-standing dispute on whether the instanton dynamics satisfies or not the anomalous Ward identity (AWI). The strong CP violation measure, when complying with the vacuum alignment, is proportional to the topological susceptibility. We obtain an effective CP-violating lagrangian different from that provided by Baluni. To solve the IR divergence problem of the instanton computation, We present a ``classically gauged'' Georgi-Manohar model and derive an effective potential which uniquely determines an explicit $U(1)_A$ symmetry breaking sector. The CP violation effects are analyzed in this model. It is shown that the strong CP problem and the $U(1)$ problem are closely related. Some possible solutions to both problems are also discussed with new insights.

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