Measurement of the CP-violating phase ${\varphi }_s^{J/\psi \varphi }$ using the flavor-tagged decay $B_s^0\to J/\psi \varphi$ in 8 fb${}^{-1}$ of $p \barp$ collisions

D0 Collaboration

We report an updated measurement of the CP-violating phase, ${\varphi }_s^{J/\psi \varphi }$, and the decay-width difference for the two mass eigenstates, $\Delta {\Gamma }_s$, from the flavor-tagged decay $B_s^0 \…