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Scientific article
Open access
English

Measurement of the top-quark mass using a leptonic invariant mass in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, 19
Publication date2023
First online date2023-06-05
Abstract

A measurement of the top-quark mass (m$_{t}$) in the $ t\overline{t} $ → lepton + jets channel is presented, with an experimental technique which exploits semileptonic decays of b-hadrons produced in the top-quark decay chain. The distribution of the invariant mass m$_{ℓμ}$ of the lepton, ℓ (with ℓ = e, μ), from the W-boson decay and the muon, μ, originating from the b-hadron decay is reconstructed, and a binned-template profile likelihood fit is performed to extract m$_{t}$. The measurement is based on data corresponding to an integrated luminosity of 36.1 fb$^{−1}$ of $ \sqrt{s} $ = 13 TeV pp collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. The measured value of the top-quark mass is m$_{t}$ = 174.41 ± 0.39 (stat.) ± 0.66 (syst.) ± 0.25 (recoil) GeV, where the third uncertainty arises from changing the Pythia8 parton shower gluon-recoil scheme, used in top-quark decays, to a recently developed setup.

eng
Keywords
  • Hadron-Hadron Scattering
  • Top Physics
  • P p: colliding beams
  • Top: mass: measured
  • Top: decay
  • P p: scattering
  • Top: pair production
  • Parton: showers
  • Final state: ((n)jet lepton)
  • ATLAS
  • Mass spectrum: (lepton muon)
  • Bottom: semileptonic decay
  • Bottom: particle identification
  • CERN LHC Coll
  • Recoil
  • Data analysis method
  • Numerical calculations: Monte Carlo
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Measurement of the top-quark mass using a leptonic invariant mass in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, p. 19. doi: 10.1007/jhep06(2023)019
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Article (Published version)
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ISSN of the journal1029-8479
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