1109.3166 (D0 Collaboration)

Measurement of the CP-violating phase $φ_s^{J/ψφ}$ using the
flavor-tagged decay $B_s^0 \rightarrow J/ψφ$ in 8 fb$^{-1}$ of $p
\barp$ collisions    [PDF]

D0 Collaboration

We report an updated measurement of the CP-violating phase, $\phi_s^{J/\psi
\phi}$, and the decay-width difference for the two mass eigenstates, $\Delta
\Gamma_s$, from the flavor-tagged decay $B_s^0 \rightarrow J/\psi \phi$. The
data sample corresponds to an integrated luminosity of 8.0 fb$^{-1}$
accumulated with the D0 detector using $p \barp$ collisions at $\sqrt{s} =
1.96$ TeV produced at the Fermilab Tevatron collider. The 68% confidence level
intervals, including systematic uncertainties, are $\Delta \Gamma_s = 0.163
+0.065 -0.064 ps^{-1}$ and $\phi_s^{J/\psi \phi} = -0.55 +0.38 -0.36$. The
$p$-value for the Standard Model point is 29.8%.

View original: http://arxiv.org/abs/1109.3166