Combined D0 Measurements Constraining the CP-violating Phase and Width Difference in the $B_s^0$ System

TL;DR

This paper combines multiple measurements from the D0 experiment to constrain the CP-violating phase and width difference in the B_s^0 meson system, providing updated values with uncertainties.

Contribution

It presents a combined analysis of D0 measurements to improve constraints on B_s^0 mixing parameters, incorporating new data and world averages.

Findings

Delta Gamma_s = 0.13 +- 0.09 ps^{-1}

phi_s = -0.70^{+0.47}_{-0.39}

Results are consistent with the Standard Model expectations.

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 +- 0.09 ps$^{-1}$ and phi_s = -0.70 ^{+0.47}_{-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.