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

Abstract

The lifetime of the $B_s^0$ meson is measured in the decay channel $B^{0}_{s} \to J/ψ\mbox{ }π^+ π^-$ with $880\le M_{{\pi }^{+}{\pi }^{-}}\le 1080$ 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 $B_s^0$ meson is measured to be $τ(B^{0}_{s}) = 1.70\pm 0.14 \mbox{ (stat)} \pm 0.05 \mbox{ (syst) ps}$. 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 $B_s^0$, $Γ_H = 0.59 \pm 0.05 \mbox{ (stat)} \pm 0.02 \mbox{ (syst)} \mbox{ ps$^{-1}$}$.

Submitted to Phys. Rev. D