✎ CP Symmetry [The Physics Travel Guide]

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====== CP Symmetry ======

* [[https://www.symmetrymagazine.org/article/charge-parity-violation|Charge-parity violation]] by Symmetry Magazine
  * [[http://web.mit.edu/physics/news/physicsatmit/physicsatmit_06_sciollafeature.pdf|The Mystery of CP Violation]] by Gabriele Sciolla

<tabbox Concrete> 
{{ :advanced_notions:cpviolationobservables.png?nolink |}}

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* A nice introduction is [[https://arxiv.org/abs/hep-ph/0406326|The Theory of CP-Violation -- in as Much of a Nutshell as Will Fit on 8 Pages]] by Patricia Ball
  * For a nice PhD thesis on the topic, see [[https://arxiv.org/pdf/1608.05240.pdf|CP and other Symmetries of Symmetries]] by Andreas Trautner
  * Great textbooks on CP violation is "CP Violation" by Branco, Lavoura, and Silva and "Discrete Symmetries and CP Violation: From Experiment to Theory" by Marco Sozzi
  * Other famous books on CP violation are "CP Violation" by Jarlskog, and "CP Violation" by Bigi and Sanda

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**CP Violation in the Neutrino Sector**

* The CP phase in the neutrino sector has not been measured yet. The newest current results can be found in https://arxiv.org/abs/1805.05917.

* An extensive discussion of how to consistently define a CP symmetry in gauge theories can be found in [[https://arxiv.org/abs/hep-ph/9506272|Automorphisms in Gauge Theories and the Definition of CP and P]] by W. Grimus and M. N. Rebelo
  * [[https://arxiv.org/abs/math-ph/0012006|The Pin Groups in Physics]] by Berg et. al.

<tabbox Why is it interesting?> 
A CP transformation transforms a particle into the corresponding antiparticle. A intact CP symmetry therefore means that particles and antiparticles are indistinguishable. However, we know from experiments that CP is a broken symmetry since, for example, there are more particles than antiparticles in the visible universe.

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