Measurements of t ¯ t differential cross-sections of highly boosted top quarks decaying to all-hadronic final states in p p collisions at √ s = 13     TeV using the ATLAS detector

Research output: Contribution to journalArticlepeer-review

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

Abstract

Measurements are made of differential cross-sections of highly boosted pair-produced top quarks as a function of top-quark and tt. system kinematic observables using proton-proton collisions at a center-of-mass energy of s=13 TeV. The data set corresponds to an integrated luminosity of 36.1 fb-1, recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Events with two large-radius jets in the final state, one with transverse momentum pT>500 GeV and a second with pT>350 GeV, are used for the measurement. The top-quark candidates are separated from the multijet background using jet substructure information and association with a b-tagged jet. The measured spectra are corrected for detector effects to a particle-level fiducial phase space and a parton-level limited phase space, and are compared to several Monte Carlo simulations by means of calculated χ2 values. The cross-section for tt. production in the fiducial phase-space region is 292±7(stat)±71(syst) fb, to be compared to the theoretical prediction of 384±36 fb.

Bibliographical metadata

Original languageEnglish
Article number012003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume98
Issue number1
Early online date25 Jul 2018
DOIs
Publication statusPublished - 25 Jul 2018