Abstract
The effective lifetime of the B$^0_\mathrm{s}$ meson in the decay B$^0_\mathrm{s}$$\to$ J/$\psi$K$^0_\mathrm{S}$ is measured using data collected during 2016-2018 with the CMS detector in $\sqrt{s}$ = 13 TeV proton-proton collisions at the LHC, corresponding to an integrated luminosity of 140 fb$^{-1}$. The effective lifetime is determined by performing a two-dimensional unbinned maximum likelihood fit to the B$^0_\mathrm{s}$ meson invariant mass and proper decay time distributions. The resulting value of 1.59 $\pm$ 0.07 (stat) $\pm$ 0.03 (syst) ps is the most precise measurement to date and is in good agreement with the expected value.
Keywords
Physics
Large Hadron Collider
Luminosity
Particle physics
Proton
Invariant mass
Meson
Nuclear physics
Quantum mechanics
Subject Areas
High-Energy Particle Collisions Research
·Nuclear and High Energy Physics ·Physical Sciences
Particle physics theoretical and experimental studies
·Nuclear and High Energy Physics ·Physical Sciences
Quantum Chromodynamics and Particle Interactions
·Nuclear and High Energy Physics ·Physical Sciences