A measurement of ∆Γ<inf>s</inf>

Abstract

Abstract Using a dataset corresponding to 9 fb−1 of integrated luminosity collected with the LHCb detector between 2011 and 2018 in proton-proton collisions, the decay-time distributions of the decay modes $$ {B}_s^0\to J/{\psi \eta}^{\prime } $$ B s 0

→ J /

ψη ′

and $$ {B}_s^0\to J/\psi {\pi}^{+}{\pi}^{-} $$

B s 0

→ J / ψ

π +

π −

are studied. The decay-width difference between the light and heavy mass eigenstates of the $$ {B}_s^0 $$

B s 0

meson is measured to be ∆Γs = 0.087 ± 0.012 ± 0.009 ps−1, where the first uncertainty is statistical and the second systematic.