Measurement of CP violation and the Bºs meson decay width difference with Bºs→J/ψK+K- and Bºs→J/ψπ +π - decays

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Back, J. J. ; Craik, Daniel ; Dossett, D. ; Gershon, T. J. ; Kreps, Michal ; Latham, Thomas ; Pilar, T. ; Poluektov, Anton ; Reid, Matthew M. ; Silva Coutinho, R. ; Whitehead, M. (Mark) ; Williams, M. P. ; HASH(0x561a12ae72b8) (2013)

The time-dependent CP asymmetry in Bºs→J/ψK+K - decays is measured using pp collision data at √s=7 TeV, corresponding to an integrated luminosity of 1.0 fb-1, collected with the LHCb detector. The decay-time distribution is characterized by the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the Bºs-B̄ºs system and by a CP-violating phase s. In a sample of 27 617 Bºs→J/ψK+K- decays, where the dominant contribution comes from Bºs→J/ψ decays, these parameters are measured to be s=0.07±0.09(stat) ±0.01(syst) rad, Γs≡(ΓL+Γ H)/2=0.663±0.005(stat)±0.006(syst) ps-1, and ΔΓs≡ΓL-ΓH=0. 100±0.016(stat)±0.003(syst) ps-1, corresponding to the single most precise determination of s, ΔΓs, and Γs. The result of performing a combined analysis with Bs0→J/ψπ+π- decays gives s=0.01±0.07(stat)±0.01(syst) rad, Γs= 0.661±0.004(stat)±0.006(syst) ps-1, and ΔΓs=0.106±0.011(stat)±0.007(syst) ps -1. All measurements are in agreement with the Standard Model predictions.
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