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Type: Journal article
Title: Time dependent angular analysis of the decay B-s(0) -> J/ψϕ and extraction of ΔΓ(s) and the CP-violating weak phase ϕ(s) by ATLAS
Other Titles: Time dependent angular analysis of the decay B-s(0) -> J/psi phi and extraction of Delta Gamma(s) and the CP-violating weak phase phi(s) by ATLAS
Author: Jackson, P.
White, M.
Citation: The Journal of High Energy Physics, 2012; 2012(12):72-0-72-33
Publisher: Institute of Physics Publishing
Issue Date: 2012
ISSN: 1029-8479
Contributor: Jackson, Paul Douglas
Statement of
The ATLAS collaboration
Abstract: A measurement of B0(s)→J/ψϕ decay parameters, including the CP -violating weak phase ϕ(s) and the decay width difference ΔΓ(s) is reported, using 4.9 fb⁻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(s) and the transversity amplitudes |A 0(0)|² and |A ∥(0)|² are also measured. The values reported for these parameters are: ϕ(s)=0.22±0.41 (stat.)±0.10 (syst.) rad, ΔΓ(s)=0.053±0.021 (stat.)±0.010 (syst.) ps⁻¹, Γ(s)=0.677±0.007 (stat.)±0.004 (syst.) ps⁻¹, |A0(0)|2=0.528±0.006 (stat.)±0.009 (syst.), |A∥(0)|2=0.220±0.008 (stat.)±0.007 (syst.) where the values quoted for ϕ(s) and ΔΓ(s) correspond to the solution compatible with the external measurements to which the strong phase δ(⊥) is constrained and where ΔΓ(s) is constrained to be positive. The fraction of S-wave KK or f₀ contamination through the decays B0(s)→J/ψK+K−(f₀) is measured as well and is found to be consistent with zero. Results for ϕ(s) and ΔΓ(s) are also presented as 68%, 90% and 95% likelihood contours, which show agreement with Standard Model expectations.
Keywords: Hadron-Hadron Scattering
Description: ATLAS Contributor: Paul Douglas Jackson for the School of Chemistry and Physics, University of Adelaide, North Terrace Campus, 5000, SA, Australia Extent: 34p.
Rights: Open Access, Copyright CERN, for the benefit of the ATLAS collaboration
RMID: 0020126397
DOI: 10.1007/JHEP12(2012)072
Appears in Collections:Chemistry and Physics publications

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