Vacuum structure of QCD in an effective Langrangian approach
The vacuum structure of QCD is studied using an anomalous effective Lagrangian approach. This approach makes it possible to determine how physical observables depend on the strong CP violation parameter, θ. The θ -dependence of QCD and the phenomenology of the light pseudoscalar mesons in this th...
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| Language: | English |
| Published: |
2009
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| Online Access: | http://hdl.handle.net/2429/11141 |
| Summary: | The vacuum structure of QCD is studied using an anomalous effective Lagrangian approach.
This approach makes it possible to determine how physical observables depend
on the strong CP violation parameter, θ. The θ -dependence of QCD and the phenomenology
of the light pseudoscalar mesons in this theory are illustrated. The vacuum structure
of QCD is shown to be quite complex with the prediction of a number of different types
of nontrivial vacuum states. Two specific examples of nontrivial vacuum states are analysed
in more detail. The decay rate of a metastable vacuum state for the θ = 0 case
is nonperturbatively calculated in both the zero and high temperature limits. The formation
of a nontrivial vacuum state in heavy ion collisions is predicted in a simplified
numerical model. These results have implications for the study of the evolution of the
early universe near the QCD phase transition and may be tested experimentally very
soon in heavy ion collision experiments. |
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