Measurement of $\boldmath {B_s^0}$ mixing parameters from the flavor-tagged decay

TL;DR

This paper measures the B_s^0 meson mixing parameters, including the width difference and CP-violating phase, using flavor-tagged decay data from the D0 detector at Fermilab, providing key insights into B_s^0 oscillations.

Contribution

First measurement of B_s^0 mixing parameters using flavor-tagged decay data at the Tevatron, with new constraints on the width difference and CP-violating phase.

Findings

Measured $ riangle \Gamma_s = 0.19 \, ext{ps}^{-1}$ with uncertainties.

Determined CP-violating phase $\\phi_s = -0.57$ with uncertainties.

Provided 90% confidence level intervals for $ riangle \\Gamma_s$ and $\\phi_s$.

Abstract

From an analysis of the flavor-tagged decay \bsdec we obtain the width difference between the $B_s^0$ light and heavy mass eigenstates, $\Delta \Gamma_s \equiv \Gamma_L - \Gamma_H = 0.19 \pm 0.07 {\rm (stat)}\thinspace ^{+0.02}_{-0.01} {\rm (syst)}$ ps$^{-1}$, and the CP-violating phase, $\phi_{s} =-0.57 ^{+0.24}_{-0.30} {\rm (stat)}\thinspace ^{+0.07}_{-0.02} {\rm (syst)}$. The allowed 90% C.L. intervals of $\Delta \Gamma_s$ and $\phi_s$ are $0.06 <\Delta \Gamma_s <0.30$ ps$^{-1}$ and $-1.20 <\phi_s < 0.06$, respectively. The data sample corresponds to an integrated luminosity of 2.8 fb$^{-1}$ accumulated with the D0 detector at the Fermilab Tevatron collider.