Search for heavy particles decaying into top-quark pairs using lepton-plus-jets events in proton–proton collisions at √s=13 TeV with the ATLAS detector

Research output: Contribution to journalArticle

  • External authors:
  • Agni Bethani
  • Ian Connelly
  • Brian Cox
  • Jonathan Crane
  • Cinzia Da Via
  • Nicholas Dann
  • Alessandra Forti
  • David Lack
  • Jiri Masik
  • Stephen Menary
  • Alexander Oh
  • Emily Orgill
  • Joleen Pater
  • Yvonne Peters
  • Yang Qin
  • Jacob Rawling
  • Rhys Roberts
  • Nicolas Scharmberg
  • Savanna Shaw
  • Stephen Watts
  • Terence Wyatt
  • The ATLAS Collaboration

Abstract

A search for new heavy particles that decay into top-quark pairs is performed using data collected from proton–proton collisions at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The integrated luminosity of the data sample is 36.1 fb−1. Events consistent with top-quark pair production are selected by requiring a single isolated charged lepton, missing transverse momentum and jet activity compatible with a hadronic top-quark decay. Jets identified as likely to contain b-hadrons are required to reduce the background from other Standard Model processes. The invariant mass spectrum of the candidate top-quark pairs is examined for local excesses above the background expectation. No significant deviations from the Standard Model predictions are found. Exclusion limits are set on the production cross-section times branching ratio for hypothetical Z′ bosons, Kaluza–Kein gluons and Kaluza–Klein gravitons that decay into top-quark pairs.

Bibliographical metadata

Original languageEnglish
JournalEuropean Physical Journal C. Particles and Fields
Volume78
Issue number565
Early online date9 Jul 2018
DOIs
Publication statusPublished - Jul 2018