Combined D0 measurements constraining the CP-violating phase and width difference in the B_s⁰ system

Abstract

We combine the D0 measurement of the width difference between the light and heavy B_s⁰ mass eigenstates and of the CP-violating mixing phase determined from the time-dependent angular distributions in the B_s⁰→J/ψ□ 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_s⁰ lifetime, we obtain ΔΓ_s≡(Γ_L-Γ_H)=0.13±0.09 ps⁻¹ and |□_s|=0.70-0.47+0.39 or ΔΓs=-0.13±0.09 ps⁻¹ and |□_s|=2.44_-0.39^+0.47. The data sample corresponds to an integrated luminosity of 1.1 fb⁻¹ accumulated with the D0 detector at the Fermilab Tevatron Collider.