Time-dependent angular analysis of the decay B[0 over s] → J/ψϕ and extraction of ΔΓ[subscript s] and the CP-violating weak phase ϕ[subscript s] by ATLAS
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Taylor_Time-dependent angular analysis.pdf
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747.77 KB
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ac866ff5e50d82fca8d65ad13ae1ab4d
Author(s)
Taylor, Frank E.
Date Issued
December 2012
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, et al. “Time-dependent angular analysis of the decay B[0 over s] → J/ψϕ and extraction of ΔΓ[subscript s] and the CP-violating weak phase ϕ[subscript s] by ATLAS.” Journal of High Energy Physics 2012, no. 12 (December 13, 2012). © CERN, for the benefit of the ATLAS collaboration
Version
Final published version
Abstract
A measurement of B[0 over s] → J/ψϕ decay parameters, including the CP-violating weak phase ϕ[subscript s] and the decay width difference ΔΓ[subscript s] is reported, using 4.9 fb[superscript −1] of integrated luminosity collected in 2011 by the ATLAS detector from LHC pp collisions at a centre-of-mass energy s√ = 7 TeV. The mean decay width Γ[subscript s] and the transversity amplitudes |A [subscript 0](0)|[superscript 2] and |A [subscript ∥](0)|[superscript 2] are also measured. The values reported for these parameters are: ϕ[subscript s] = 0.22 ± 0.41 (stat.) ± 0.10 (syst.) rad; ΔΓ[subscript s] = 0.053 ± 0.021 (stat.) ± 0.010 (syst.) ps[superscript −1]; Γ[subscript s] = 0.677 ± 0.007 (stat.) ± 0.004 (syst.) ps[superscript −1]; |A[subscript 0](0)|[superscript 2] = 0.528 ± 0.006 (stat.) ± 0.009 (syst.); |A[subscript ∥](0)|[superscript 2] = 0.220 ± 0.008 (stat.) ± 0.007 (syst.) where the values quoted for ϕ[subscript s] and ΔΓ[subscript s] correspond to the solution compatible with the external measurements to which the strong phase δ[subscript ⊥] is constrained and where ΔΓ[subscript s] is constrained to be positive. The fraction of S-wave KK or f[subscript 0] contamination through the decays B[0 over s] → J/ψK[superscript +]K[superscript −](f[subscript 0]) is measured as well and is found to be consistent with zero. Results for ϕ[subscript s] and ΔΓ[subscript s] are also presented as 68%, 90% and 95% likelihood contours, which show agreement with Standard Model expectations.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/jhep12(2012)072
