Publication
Title
Observation of four top quark production in proton-proton collisions at √s=13 TeV
Author
Institution/Organisation
CMS Collaboration
Abstract
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 138 fb-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+3.7-3.5 (stat)+2.3-1.9 (syst) fb, in agreement with the available standard model predictions.
Language
English
Source (journal)
Physics letters : B. - Amsterdam, 1967, currens
Publication
Amsterdam : North-Holland , 2023
ISSN
0370-2693
DOI
10.1016/J.PHYSLETB.2023.138290
Volume/pages
847 (2023) , p. 1-32
Article Reference
138290
ISI
001123208000001
Medium
E-only publicatie
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
Project info
AMVA4NewPhysics: Advanced Multi-Variate Analysis for New Physics Searches at the LHC
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identifier
Creation 29.03.2024
Last edited 25.04.2024
To cite this reference