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According to the current mathematical formulation of quantum chromodynamics, a violation of [[CP-symmetry]] in [[strong interaction]]s could occur. However, no violation of the CP-symmetry has ever been seen in any experiment involving only the strong interaction. As there is no known reason in QCD for it to necessarily be conserved, this is a "fine tuning" problem known as the '''strong CP problem'''.
The strong CP problem is sometimes regarded as an [[List of unsolved problems in physics|unsolved problem in physics]], and has been referred to as "the most underrated puzzle in all of physics."<ref>{{cite conference |first=Thomas |last=Mannel |title=Theory and Phenomenology of CP Violation |booktitle=Nuclear Physics B
|volume=167 |pages=170–174 |publisher=Elsevier |conference=The 7th International Conference on Hyperons, Charm, and Beauty Hadrons (BEACH 2006) |date=2–8 July 2006 |___location=Lancaster |url=https://indico.cern.ch/event/427023/session/6/contribution/43/attachments/912026/1288208/Lancester-Mannel-Proc.pdf |doi=10.1016/j.nuclphysbps.2006.12.083 |accessdate=15 Aug 2015 |bibcode=2007NuPhS.167..170M}}</ref><ref>https://www.forbes.com/sites/startswithabang/2019/11/19/the-strong-cp-problem-is-the-most-underrated-puzzle-in-all-of-physics</ref>
==CP violation==
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