Measurement of the CP-violating phase ϕₛʲ/ψϕ using the flavor-tagged decay Bₛ⁰ → J/ψϕ in 8 fb⁻¹ of p collisions

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We report an updated measurement of the CP-violating phase, ϕₛʲ/ψϕ, and the decay-width difference for the two mass eigenstates, ΔΓₛ, from the flavor-tagged decay Bₛ⁰ → J/ψϕ. The data sample corresponds to an integrated luminosity of 8.0 fb⁻¹ accumulated with the D0 detector using p collisions at √s = 1.96 TeV produced at the Fermilab Tevatron collider. The 68% confidence level intervals, including systematic uncertainties, are ΔΓₛ = 0.163 +0.065 -0.064 ps⁻¹ and ϕₛʲ/ψϕ = -0.55 +0.38 -0.36. The p-value for the Standard Model point is 29.8%.