Flavor tagged time-dependent angular analysis of the B[0 over s] → J/ψϕ decay and extraction of ΔΓ[subscript s] and the weak phase ϕ[subscript s] in ATLAS
Author(s)Taylor, Frank E.
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A measurement of the B[0 over s] → J/ψϕ decay parameters, updated to include flavor tagging is reported using 4.9 fb[superscript −1] of integrated luminosity collected by the ATLAS detector from √s = 7 TeV pp collisions recorded in 2011 at the LHC. The values measured for the physical parameters are ϕ[subscript s] 0.12 ± 0.25(stat) ± 0.05(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)|[superscript 2] 0.220 ± 0.008(stat) ± 0.009(syst) |A[subscript 0](0)|[superscript 2] 0.529 ± 0.006(stat) ± 0.012(syst) δ[subscript ⊥] = 3.89 ± 0.47(stat) ± 0.11(syst) rad where the parameter ΔΓ[subscript s] is constrained to be positive. The S-wave contribution was measured and found to be compatible with zero. Results for ϕ[subscript s] and ΔΓ[subscript s] are also presented as 68% and 95% likelihood contours, which show agreement with the Standard Model expectations.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review D
American Physical Society
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, et al. “Flavor Tagged Time-Dependent Angular Analysis of the B[0 over s] → J/ψϕ Decay and Extraction of ΔΓ[subscript s] and the Weak Phase ϕ[subscript s] in ATLAS.” Phys. Rev. D 90, no. 5 (September 2014). © 2014 CERN, for the ATLAS Collaboration
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