$B^{0}_{s}$ lifetime measurement in the CP-odd decay channel $B^{0}_{s} \to J/\psi\mbox{ }f_{0}(980)$

TL;DR

This paper reports a precise measurement of the $B^{0}_{s}$ meson lifetime in a CP-odd decay channel using data from the D0 detector, providing insights into heavy meson properties.

Contribution

The study presents the first lifetime measurement of $B^{0}_{s}$ in the $J/eta ext{ }_0(980)$ decay channel with a large dataset, improving understanding of $B^{0}_{s}$ properties.

Findings

Measured $B^{0}_{s}$ lifetime as 1.70 ps with uncertainties.

Determined the width of the heavy $B^{0}_{s}$ eigenstate as 0.59 ps$^{-1}$.

Results are consistent with Standard Model predictions.

Abstract

The lifetime of the $B^{0}_{s}$ meson is measured in the decay channel $B^{0}_{s} \to J/\psi\mbox{ }\pi^+ \pi^-$ with $880 \leq M_{\pi^+\pi^-} \leq 1080$ MeV/$c^2$, which is mainly a CP-odd state and dominated by the $f_{0}(980)$ resonance. In 10.4 fb$^{-1}$ of data collected with the D0 detector in Run II of the Tevatron, the lifetime of the $B^{0}_{s}$ meson is measured to be $\tau(B^{0}_{s}) = 1.70\pm 0.14 \mbox{ (stat)} \pm 0.05 \mbox{ (syst) ps}$. Neglecting CP violation in $B_s^0/\bar{B}_s^0$ mixing, the measurement can be translated into the width of the heavy mass eigenstate of the $B^0_s$, $\Gamma_H = 0.59 \pm 0.05 \mbox{ (stat)} \pm 0.02 \mbox{ (syst)} \mbox{ ps$^{-1}$}$.