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CP violation in the B0s system

Artuso, Marina; Borissov, Guennadi; Lenz, Alexander

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Marina Artuso

Guennadi Borissov

Alexander Lenz


Experimental and theoretical studies of CP violation in the B0s system are reviewed. Updated predictions for the mixing parameters of the B0s mesons expected in the standard model (SM) are given, namely, the mass difference ΔMSMs=18.3±2.7  ps−1, the decay rate difference ΔΓSMs=0.085±0.015  ps−1, and the flavor-specific CP asymmetry as,SMfs=(2.22±0.27)×10−5 and the equivalent quantities in the B0 sector. Current experimental values of ΔMs and ΔΓs agree with remarkable precision with theoretical expectations. This agreement supports the applicability of theoretical tools such as the heavy quark expansion to these decays. CP-violating studies in the B0s system provide essential information to test the SM expectations and to unveil a possible contribution of the new physics (NP). NP effects on ΔMs of the order of 15% are still possible. The CP phase ϕs due to CP violation in interference of decays and mixing can accommodate effects of the order of O(100%). The semileptonic CP asymmetry assl due to CP violation in mixing could still be a factor of 130 larger than its robust SM expectation and thus provides a very clean observable for NP searches. Theoretical improvements that are necessary to make full use of the experimental precision are discussed.


Artuso, M., Borissov, G., & Lenz, A. (2016). CP violation in the B0s system. Reviews of Modern Physics, 88(4), Article 045002.

Journal Article Type Article
Acceptance Date Dec 7, 2015
Online Publication Date Oct 13, 2016
Publication Date Oct 13, 2016
Deposit Date Dec 7, 2015
Publicly Available Date Dec 14, 2015
Journal Reviews of Modern Physics
Print ISSN 0034-6861
Electronic ISSN 1539-0756
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 88
Issue 4
Article Number 045002


Published Journal Article (3.9 Mb)

Copyright Statement
Reprinted with permission from the American Physical Society: Reviews of Modern Physics 88, 045002 © (2016) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.

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