Combined $D^0$ measurements constraining the CP-violating phase and width difference in the $B^0_s$ system

Abstract

We combine the D0 measurement of the width difference between the light and heavy B_s^0 mass eigenstates and of the CP-violating mixing phase determined from the time-dependent angular distributions in the B_s -> J/psi phi decays along with the charge asymmetry in semileptonic decays also measured with the D0 detector. With the additional constraint from the world average of the flavor-specific B_s^0 lifetime, we obtain Delta Gamma_s = (Gamma_L - Gamma_H) = 0.13 _s16- 0.09 ps$^{-1}$ and phi_s = -0.70 ^{_s160.47}_{-0.39}. The data sample corresponds to an integrated luminosity of 1.1 fb^{-1} accumulated with the D0 detector at the Fermilab Tevatron Collider.