Measurement of the CP-violating phase ϕs and the Bs0 meson decay width difference with Bs0 → J/ψϕ decays in ATLAS

Barton, Adam Edward and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Dearnaley, William and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Skinner, Malcolm and Smizanska, Maria and Walder, James William and Wharton, Andy (2016) Measurement of the CP-violating phase ϕs and the Bs0 meson decay width difference with Bs0 → J/ψϕ decays in ATLAS. Journal of High Energy Physics (8). ISSN 1029-8479

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Abstract

A measurement of the Bs0 decay parameters in the Bs0 → J/ψϕ channel using an integrated luminosity of 14.3 fb−1 collected by the ATLAS detector from 8 TeV pp collisions at the LHC is presented. The measured parameters include the CP -violating phase ϕs, the decay width Γs and the width difference between the mass eigenstates ΔΓs. The values measured for the physical parameters are statistically combined with those from 4.9 fb−1 of 7 TeV data, leading to the following: ϕs=−0.090±0.078(stat.)±0.041(syst.)rad ΔΓs=0.085±0.011(stat.)±0.007(syst.)ps−1 Γs=0.675±0.003(stat.)±0.003(syst.)ps−1 In the analysis the parameter ΔΓs is constrained to be positive. Results for ϕs and ΔΓs are also presented as 68% and 95% likelihood contours in the ϕs-ΔΓs plane. Also measured in this decay channel are the transversity amplitudes and corresponding strong phases. All measurements are in agreement with the Standard Model predictions.

Item Type: Journal Article
Journal or Publication Title: Journal of High Energy Physics
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 81845
Deposited By: ep_importer_pure
Deposited On: 29 Sep 2016 15:26
Refereed?: Yes
Published?: Published
Last Modified: 13 Nov 2019 06:58
URI: https://eprints.lancs.ac.uk/id/eprint/81845

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