Measurement of the CP-violating phase φ<i><sub>s</sub></i> and the <i>B<sub>s</sub></i><SUP>0</SUP> meson decay width difference with <i>B<sub>s</sub><SUP>0</SUP></i> → J/ψφ decays in ATLAS



Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R
et al (show 2847 more authors) (2016) Measurement of the CP-violating phase φ<i><sub>s</sub></i> and the <i>B<sub>s</sub></i><SUP>0</SUP> meson decay width difference with <i>B<sub>s</sub><SUP>0</SUP></i> → J/ψφ decays in ATLAS. JOURNAL OF HIGH ENERGY PHYSICS, 08 (8). 147-.

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Abstract

A measurement of the $B^0_s$ decay parameters in the $B^0_s \to J/\psi\phi$ channel using an integrated luminosity of 14.3 $\mathrm{fb}^{-1}$ collected by the ATLAS detector from 8 TeV $pp$ collisions at the LHC is presented. The measured parameters include the $CP$-violating phase $\phi_s$, the decay width $\Gamma_s$ and the width difference between the mass eigenstates $\Delta\Gamma_s$. The values measured for the physical parameters are statistically combined with those from 4.9 $\mathrm{fb}^{-1}$ of 7 TeV data, leading to the following: \begin{eqnarray*} \phi_s & = & -0.090 \pm 0.078\;\mathrm{(stat.)} \pm 0.041\;\mathrm{(syst.)\;rad} \\ \Delta\Gamma_s & = & 0.085 \pm 0.011\;\mathrm{(stat.)} \pm 0.007\;\mathrm{(syst.)\;ps}^{-1} \\ \Gamma_s & = & 0.675 \pm 0.003\;\mathrm{(stat.)} \pm 0.003\;\mathrm{(syst.)\;ps}^{-1}. \end{eqnarray*} In the analysis the parameter $\Delta\Gamma_s$ is constrained to be positive. Results for $\phi_s$ and $\Delta\Gamma_s$ are also presented as 68% and 95% likelihood contours in the $\phi_s-\Delta\Gamma_s$ 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: Article
Additional Information: 27 pages plus author list (44 pages total), 10 figures, 8 tables, published version, all figures and tables are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2014-03/
Uncontrolled Keywords: B physics, CP violation, Flavor physics, Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 16 Mar 2017 11:26
Last Modified: 12 Oct 2023 05:48
DOI: 10.1007/JHEP08(2016)147
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006441