TY - JOUR
T1 - Observation of four top quark production in proton-proton collisions at √s = 13TeV
AU - the CMS Collaboration
AU - Hayrapetyan, A.
AU - Tumasyan, A.
AU - Adam, W.
AU - Andrejkovic, J. W.
AU - Bergauer, T.
AU - Chatterjee, S.
AU - Damanakis, K.
AU - Dragicevic, M.
AU - Escalante Del Valle, A.
AU - Brooke, J. J.
AU - Bundock, A.
AU - Bury, F.
AU - Clement, E.
AU - Cussans, D.
AU - Flacher, H.
AU - Glowacki, M.
AU - Goldstein, J.
AU - Heath, H. F.
AU - Kreczko, L.
AU - Krikler, B.
AU - Paramesvaran, S.
AU - Seif El Nasr-Storey, S.
AU - Smith, V. J.
AU - Stylianou, N.
AU - Walkingshaw Pass, K.
AU - Linacre, J.
AU - Newbold, D. M.
AU - Cole, J. E.
AU - Chertok, M.
AU - Citron, M.
N1 - Publisher Copyright:
© 2023 The Author(s).
PY - 2023/12/10
Y1 - 2023/12/10
N2 - The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC and corresponding to an integrated luminosity of 138fb−1. Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis. Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be 17.7−3.5+3.7(stat)−1.9+2.3(syst)fb, in agreement with the available standard model predictions.
AB - The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC and corresponding to an integrated luminosity of 138fb−1. Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis. Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be 17.7−3.5+3.7(stat)−1.9+2.3(syst)fb, in agreement with the available standard model predictions.
KW - CMS
KW - Top quark
UR - https://www.scopus.com/pages/publications/85182843712
U2 - 10.1016/j.physletb.2023.138290
DO - 10.1016/j.physletb.2023.138290
M3 - Article (Academic Journal)
AN - SCOPUS:85182843712
SN - 0370-2693
VL - 847
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
M1 - 138290
ER -