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000916241 037__ $$aFZJ-2022-06042
000916241 041__ $$aEnglish
000916241 1001_ $$0P:(DE-Juel1)131377$$aWirzba, Andreas$$b0$$eCorresponding author$$ufzj
000916241 1112_ $$aRDP online PhD school and workshop 'Aspects of Symmetry'$$cOnline$$d2021-11-08 - 2021-11-12$$gRegio2021$$wRep of Georgia
000916241 245__ $$aStrong CP Problem
000916241 260__ $$bSissa Medialab Trieste, Italy$$c2022
000916241 29510 $$aProceedings of RDP online PhD school and workshop 'Aspects of Symmetry' — PoS(Regio2021) - Sissa Medialab Trieste, Italy, 2022. - ISBN - doi:10.22323/1.412.0003
000916241 300__ $$a23 pages
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000916241 4900_ $$v412
000916241 520__ $$aQuantum chromodynamics, the theory of strong interaction, admits a term which explicitly violates parity P and time reflection invariance T and due to the CPT theorem, also CP. Naturalness would predict this term with strength one, whereas empirical evidence from the electric dipole moment of the neutron yields an upper bound of almost vanishing strength of this term. This is the so-called strong CP problem. In this report, I follow the path from the initial U(1)A problem of strong interaction physics, via the U(1)A anomaly and instantons, the theta vacuum, the electric dipole moment of the neutron and the necessity of explicit symmetry breaking to the Peccei-Quinn model, extended to invisible axions and axion-like particles and finally back to electric dipole moments of subatomic particles.
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000916241 9201_ $$0I:(DE-Juel1)IAS-4-20090406$$kIAS-4$$lTheorie der Starken Wechselwirkung$$x0
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