Measurement of the $$ {textrm{B}}_{textrm{s}}^0to textrm{J}/{uppsi textrm{K}}_{textrm{S}}^0 $$ effective lifetime from proton-proton collisions at $$ sqrt{s} $$ = 13 TeV Journal Article

Overview

Abstract; The effective lifetime of the $$ {textrm{B}}_{textrm{s}}^0 $$; ; B; s; 0; ; meson in the decay $$ {textrm{B}}_{textrm{s}}^0to textrm{J}/{uppsi textrm{K}}_{textrm{S}}^0 $$; ; B; s; 0; ; →; J; /; ; ψK; S; 0; ; is measured using data collected during 2016–2018 with the CMS detector in $$ sqrt{s} $$; ; 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 $$ {textrm{B}}_{textrm{s}}^0 $$; ; B; s; 0; ; meson invariant mass and proper decay time distributions. The resulting value of 1.59 ± 0.07(stat) ± 0.03(syst) ps is the most precise measurement to date and is in good agreement with the expected value.

Hayrapetyan A; Tumasyan A; Adam W; Andrejkovic JW; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Hussain PS; Jeitler M