Measurement of the CP-violating phase φs and the B⁰s meson decay width difference with B⁰s → J/ψφ decays in ATLAS

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurement of the CP-violating phase φs and the B⁰s meson decay width difference with B⁰s → J/ψφ decays in ATLAS. Journal of High Energy Physics, 2016(8) Springer 10.1007/JHEP08(2016)147

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A measurement of the B0s decay parameters in the B0s →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 Γ s 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:
ϕ s = −0.090±0.078(stat.)±0.041(syst.)rad
ΔΓs = 0.085±0.011(stat.)±0.007(syst.)ps⁻¹
Γ s = 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.

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