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Numerical Updates of Lifetimes and Mixing Parameters of B Mesons

Lenz, Alexander; Nierste, Ulrich; Gershon, Tim

Authors

Alexander Lenz

Ulrich Nierste

Tim Gershon



Abstract

We update the Standard-Model predictions for several quantities related to Bs−B¯s and Bd−B¯d mixing. The mass and width differences in the Bs system read ΔMSMs=(17.3±2.6)ps−1 and ΔΓSMs=(0.087±0.021)ps−1, respectively. The CP asymmetries in flavour-specific decays are as,SMfs=(1.9±0.3)⋅10−5 and ad,SMfs=−(4.1±0.6)⋅10−4. We further critically discuss the sensitivity of ΔΓd to new physics and the uncertainties in the relation between ΔΓs and the branching fraction of Bs→D(∗)s+D(∗)s−. Then we present a numerical update of the average width Γs in the Bs system and correlate Γs with the B+-Bd lifetime ratio. Finally we summarise the key results of our recent global analysis with the CKMfitter collaboration addressing new physics in B−B¯-mixing. In an appropriately defined scenario parametrising new physics in B−B¯-mixing by two complex parameters Δd and Δs the Standard-Model point {Δd=Δs=1} is disfavoured by 3.6 standard deviations.

Citation

Lenz, A., Nierste, U., & Gershon, T. (2011). Numerical Updates of Lifetimes and Mixing Parameters of B Mesons. In 6th International Workshop on the CKM Unitarity Triangle, CKM 2010, 6-10 September 2010, University of Warwick ; proceedings

Conference Name CKM unitarity triangle : 6th International Workshop (CKM 2010)
Conference Location Warwick, UK
Start Date Sep 6, 2010
End Date Sep 10, 2010
Publication Date Jan 1, 2011
Deposit Date Mar 15, 2013
Publicly Available Date Mar 29, 2024
Book Title 6th International Workshop on the CKM Unitarity Triangle, CKM 2010, 6-10 September 2010, University of Warwick ; proceedings.
Publisher URL http://inspirehep.net/record/890169?ln=en
Related Public URLs http://arxiv.org/abs/arXiv:1102.4274

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