How does the instanton break the $U(1)_A$ symmetry in QCD?

Asked Apr 09 '19 at 02:27

Active Apr 09 '19 at 03:00

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The $U(1)_A$ symmetry in QCD is anomalous. Its supposed to be broken by the instantons. Can anyone physically describe how does that happen?

edited Apr 09 '19 at 03:00

Qmechanic

asked Apr 09 '19 at 02:27

See https://physics.stackexchange.com/q/150435/50583, https://physics.stackexchange.com/q/122206/50583 – ACuriousMind Apr 09 '19 at 17:11

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