open_problems:strong_cp_puzzle

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open_problems:strong_cp_puzzle [2020/04/02 22:14] 95.91.224.105 fixed typos |
open_problems:strong_cp_puzzle [2020/04/10 19:51] (current) 71.46.88.3 [Intuitive] |
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- | The strong CP puzzle is the observation that in the [[models:standard_model|standard model]] nothing forbids that [[models:standard_model:qcd|strong interactions]] violate [[advanced_notions:cp_symmetry|CP symmetry]] but so far such a CP violation by strong interactions was never observed. | + | The strong CP puzzle is the observation that in the [[models:standard_model|standard model]] nothing forbids that [[models:standard_model:qcd|strong interactions]] violate [[advanced_notions:cp_symmetry|CP symmetry]] but so far such a CP violation by strong interactions has never been observed. |

- | The puzzle is regarded as a deep and interesting since upon closer inspection there are possibly two sources how strong interactions could violate CP symmetry. These two sources come from completely different sectors and thus it's somewhat a mircale that they cancel exactly. | + | The puzzle is regarded as deep and interesting since upon closer inspection there are possibly two sources of how strong interactions could violate CP symmetry. These two sources come from completely different sectors and thus it's somewhat a miracle that they cancel exactly. |

One possible source comes from the nontrivial structure of the [[advanced_notions:quantum_field_theory:qcd_vacuum|ground state of the theory of strong interactions]] (QCD). | One possible source comes from the nontrivial structure of the [[advanced_notions:quantum_field_theory:qcd_vacuum|ground state of the theory of strong interactions]] (QCD). |

open_problems/strong_cp_puzzle.txt · Last modified: 2020/04/10 19:51 by 71.46.88.3

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