Strong CP problem について

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Strong CP problem ：ウィキペディア英語版

Strong CP problem
In particle physics, the strong CP problem (CP standing for charge parity) is the puzzling question of why quantum chromodynamics (QCD) does not seem to break the CP-symmetry.
According to quantum chromodynamics there could be a violation of CP symmetry in the strong interactions. However, there is no experimentally known violation of the CP-symmetry in strong interactions. As there is no known reason for it to be conserved in QCD specifically, this is a "fine tuning" problem known as the strong CP problem.
The strong CP problem is sometimes regarded as an unsolved problem in physics.
==What is CP violation==

(詳細はparticle physics, CP violation (CP standing for Charge Parity) is a violation of the postulated CP-symmetry (or Charge conjugation Parity symmetry): the combination of C-symmetry (charge conjugation symmetry) and P-symmetry (parity symmetry).

抄文引用元・出典: フリー百科事典『ウィキペディア（Wikipedia）』
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