• Open Access

Measurement of CP violation and the Bs0 meson decay width difference with Bs0J/ψK+K and Bs0J/ψπ+π decays

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. D 87, 112010 – Published 21 June 2013

Abstract

The time-dependent CP asymmetry in Bs0J/ψK+K decays is measured using pp collision data at s=7TeV, corresponding to an integrated luminosity of 1.0fb1, collected with the LHCb detector. The decay-time distribution is characterized by the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the Bs0B¯s0 system and by a CP-violating phase ϕs. In a sample of 27 617 Bs0J/ψK+K decays, where the dominant contribution comes from Bs0J/ψϕ decays, these parameters are measured to be ϕs=0.07±0.09(stat)±0.01(syst)rad, Γs(ΓL+ΓH)/2=0.663±0.005(stat)±0.006(syst)ps1, and ΔΓsΓLΓH=0.100±0.016(stat)±0.003(syst)ps1, corresponding to the single most precise determination of ϕs, ΔΓs, and Γs. The result of performing a combined analysis with Bs0J/ψπ+π decays gives ϕs=0.01±0.07(stat)±0.01(syst)rad, Γs=0.661±0.004(stat)±0.006(syst)ps1, and ΔΓs=0.106±0.011(stat)±0.007(syst)ps1. All measurements are in agreement with the Standard Model predictions.

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  • Received 10 April 2013

DOI:https://doi.org/10.1103/PhysRevD.87.112010

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2013 CERN, for the LHCb Collaboration

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Vol. 87, Iss. 11 — 1 June 2013

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