The strong CP problem

Pierre Sikivie

doi:10.1016/j.crhy.2011.10.002

The strong CP problem

Pierre Sikivie ¹

¹ Department of Physics, University of Florida, Gainesville, FL 32611, USA

Comptes Rendus. Physique, Volume 13 (2012) no. 2, pp. 176-179.

Abstract
Résumé

QCD depends on an extra parameter $\bar{θ}$ . When $\bar{θ} \neq 0$ , P and CP are violated. Because the strong interactions conserve P and CP, $\bar{θ}$ must be very small, of order $10^{- 10}$ or less. However, within the Standard Model, $\bar{θ}$ is expected to be of order one. This puzzle is called the strong CP problem. Possible solutions are briefly described.

QCD dépend dʼun paramètre supplémentaire $\bar{θ}$ . Quand $\bar{θ} \neq 0$ , les symétries P et CP sont brisées. Puisque les interactions fortes conservent P et CP, $\bar{θ}$ doit être très petit, de lʼordre de $10^{- 10}$ ou moins. Cependant, dans le Modèle Standard, $\bar{θ}$ est en général de lʼordre de un. Ce puzzle est le problème de la conservation de CP par les interactions fortes. Des solutions possibles sont brièvement décrites.

Published online: 2011-12-30

DOI: 10.1016/j.crhy.2011.10.002

Keywords: QCD, CP, Axion
Mot clés : QCD, CP, Axion

Author's affiliations:

Pierre Sikivie ¹

¹ Department of Physics, University of Florida, Gainesville, FL 32611, USA

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     title = {The strong {CP} problem},
     journal = {Comptes Rendus. Physique},
     pages = {176--179},
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     doi = {10.1016/j.crhy.2011.10.002},
     language = {en},
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Pierre Sikivie. The strong CP problem. Comptes Rendus. Physique, Volume 13 (2012) no. 2, pp. 176-179. doi : 10.1016/j.crhy.2011.10.002. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2011.10.002/

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