Why PQ?
classification
✦ hep-ph
hep-th
keywords
problemexistencesolutionbrokenchiralconcludediscussexamining
read the original abstract
I discuss how the solution of the $U(1)_A$ problem of QCD through the existence of the $\theta$-vacuum gave rise to the strong CP problem. After examining various suggested solutions to this problem, I conclude that the only viable solution still is the one that involves the existence of a spontaneously broken chiral symmetry: $U(1)_{PQ}$
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