Measurement of CP violation and the B[0 over s] meson decay width difference with B[0 over s] → J/ψK[superscript +]K[superscript −] and B[0 over s] → J/ψπ[superscript +]π[superscript −] decays
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Aaij-2013-Measurement of CP violation.pdf
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Author(s)
Williams, Michael
Date Issued
June 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaij, R., C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, et al. “Measurement of CP Violation and the B[0 over s] Meson Decay width Difference with B[0 over s] → J/ψK[superscript +]K[superscript −] and B[0 over s] → J/ψπ[superscript +]π[superscript −] Decays.” Phys. Rev. D 87, no. 11 (June 2013). © 2013 CERN, for the LHCb Collaboration
Version
Final published version
Abstract
The time-dependent CP asymmetry in B[0 over s] → J/ψK[superscript +]K[superscript −] decays is measured using pp collision data at √s = 7 TeV, corresponding to an integrated luminosity of 1.0 fb[superscript −1], collected with the LHCb detector. The decay-time distribution is characterized by the decay widths Γ[subscript L] and Γ[subscript H] of the light and heavy mass eigenstates of the B[0 over s]−[bar over B][0 over s] system and by a CP-violating phase ϕ[subscript s]. In a sample of 27 617 B[0 over s] → J/ψK[superscript +]K[superscript −] decays, where the dominant contribution comes from B[0 over s] → J/ψϕ decays, these parameters are measured to be ϕ[subscript s] = 0.07 ± 0.09(stat) ± 0.01(syst) rad, Γ[subscript s] ≡ (Γ[subscript L] + Γ[subscript H])/2 = 0.663 ± 0.005(stat) ± 0.006(syst) ps[superscript −1], and ΔΓ[subscript s] ≡ Γ[subscript L] − Γ[subscript H] = 0.100 ± 0.016(stat) ± 0.003(syst) ps[superscript −1], corresponding to the single most precise determination of ϕ[subscript s], ΔΓ[subscript s], and Γ[subscript s]. The result of performing a combined analysis with B[0 over s] →J/ψπ[superscript +]π[superscript −] decays gives ϕ[subscript s] = 0.01 ± 0.07(stat) ± 0.01(syst) rad, Γ[subscript s] = 0.661 ± 0.004(stat) ± 0.006(syst) ps[superscript −1], and ΔΓ[subscript s] = 0.106 ± 0.011(stat) ± 0.007(syst) ps[superscript −1]. All measurements are in agreement with the Standard Model predictions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.87.112010
