Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at √s = 7TeV

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The mass of the top quark is measured in a data set corresponding to 4.6 fb-1 of proton–proton collisions with centre-of-mass energy √ = 7TeV collected by the ATLAS detector at the LHC. Events consistent with hadronic decays of top–antitop quark pairs with at least six jets in the final state are selected. The substantial background from multijet production is modelled with data-driven methods that utilise the number of identified b-quark jets and the transverse momentum of the sixth leading jet, which have minimal correlation. The top-quark mass is obtained from template fits to the ratio of three-jet to dijet mass. The three-jet mass is calculated from the three jets produced in a top-quark decay. Using these three jets the dijet mass is obtained from the two jets produced in the W boson decay. The top-quark mass obtained from this fit is thus less sensitive to the uncertainty in the energy measurement of the jets. A binned likelihood fit yields a top-quark mass of mt = 175.1 ± 1.4 (stat.) ± 1.2 (syst.) GeV.

Original languageEnglish
Article number158
Pages (from-to)1-26
Number of pages26
JournalEuropean Physical Journal C
Volume75
Issue number4
DOIs
StatePublished - 30 Apr 2015

Keywords

  • ATLAS
  • Fully hadronic
  • LHC
  • Proton–proton collisions
  • Top quark
  • Top-quark mass

Fingerprint

Dive into the research topics of 'Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at √s = 7TeV'. Together they form a unique fingerprint.

Cite this