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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

Aad, G; Abajyan, T; Abbott, B; Abdallah, J; Khalek, SA; Abdelalim, AA; Abdinov, O; ... Collaboration, ATLAS; + view all (2012) 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. Journal of High Energy Physics , 2012 (12) , Article 72. 10.1007/JHEP12(2012)072. Green open access

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Abstract

A measurement of B0s→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: ϕs=0.22±0.41 (stat.)±0.10 (syst.) radΔΓs=0.053±0.021 (stat.)±0.010 (syst.) ps−1Γs=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 ΔΓs is constrained to be positive. The fraction of S-wave KK or f 0 contamination through the decays B0s→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.

Type: Article
Title: 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
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/JHEP12(2012)072
Publisher version: http://dx.doi.org/10.1007/JHEP12(2012)072
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Hadron-Hadron Scattering
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health > Infection, Immunity and Inflammation Dept
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1373205
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