Precision Measurement of CP Violation in B[0 over s] → J/ΨK[superscript +]K[superscript −] Decays
Name
PhysRevLett.114.041801.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Affolder, A.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Date Issued
January 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Precision Measurement of CP Violation in B[0 over s] → J/ΨK[superscript +]K[superscript −] Decays.” Physical Review Letters 114, no. 4 (January 2015). © 2015 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, corresponding to an integrated luminosity of 3.0 fb[superscript -1], collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV. In a sample of 96 000 B[0 over s] → J/ψK[superscript +]K[superscript -] decays, the CP-violating phase ϕ[subscript s] is measured, as well as 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. The values obtained are ϕ[subscript s] = -0.058 ± 0.049 ± 0.006 rad, Γ[subscript s] ≡ (Γ[subscript L] + Γ[subscript H])/2 = 0.6603 ± 0.0027 ± 0.0015 ps[superscript -1], and ΔΓ[subscript s] ≡ Γ[subscript L] - Γ[subscript H] = 0.0805 ± 0.0091 ± 0.0032 ps[superscript -1], where the first uncertainty is statistical and the second, systematic. These are the most precise single measurements of those quantities to date. A combined analysis with B[0 over s] → J/ψπ[superscript +]π[superscript -] decays gives ϕ[subscript s] = -0.010 ± 0.039 rad. All measurements are in agreement with the standard model predictions. For the first time, the phase ϕ[subscript s] is measured independently for each polarization state of the K[superscript +]K[superscript -] system and shows no evidence for polarization dependence.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.114.041801
