Measurement of the $CP$-violating phase ${\ensuremath{\phi}}_{s}^{J/\ensuremath{\psi}\ensuremath{\phi}}$ using the flavor-tagged decay ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$ in $8\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $p\overline{p}$ collisions

Measurement of the $C P$ -violating phase $ϕ_{s}^{J / ψ ϕ}$ using the flavor-tagged decay $B_{s}^{0} \to J / ψ ϕ$ in $8 {fb}^{- 1}$ of $p \bar{p}$ collisions

V. M. Abazov et al. (The D0 Collaboration)

Phys. Rev. D 85, 032006 – Published 22 February 2012

Abstract

We report an updated measurement of the $C P$ -violating phase, $ϕ_{s}^{J / ψ ϕ}$ , and the decay-width difference for the two mass eigenstates, $Δ Γ_{s}$ , from the flavor-tagged decay $B_{s}^{0} \to J / ψ ϕ$ . The data sample corresponds to an integrated luminosity of $8.0 {fb}^{- 1}$ accumulated with the D0 detector using $p \bar{p}$ collisions at $\sqrt{s} = 1.96 TeV$ produced at the Fermilab Tevatron collider. The 68% Bayesian credibility intervals, including systematic uncertainties, are $Δ Γ_{s} = {0.163}_{- 0.064}^{+ 0.065} {ps}^{- 1}$ and $ϕ_{s}^{J / ψ ϕ} = - {0.55}_{- 0.36}^{+ 0.38}$ . The $p$ -value for the Standard Model point is 29.8%.