Measurement of the top-quark mass using a leptonic invariant mass in pp collisions at √s = 13 TeV with the ATLAS detector
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Springer Science and Business Media Deutschland GmbH
Hadron-Hadron ScatteringTop Physics
ATLAS collaboration., Aad, G., Abbott, B. et al. Measurement of the top-quark mass using a leptonic invariant mass in pp collisions at s√ = 13 TeV with the ATLAS detector. J. High Energ. Phys. 2023, 19 (2023). [https://doi.org/10.1007/JHEP06(2023)019]
SponsorshipCERN; MICINN; COST; ERC; ERDF; Horizon 2020; Marie Skłodowska-Curie Actions; European Union; La Caixa Banking Foundation; Generalitat de Catalunya CERCA; PROMETEO; Generalitat Valenciana GenT; PIC
A measurement of the top-quark mass (mt) in the tt¯ → 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 mℓμ 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 mt. The measurement is based on data corresponding to an integrated luminosity of 36.1 fb−1 of 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 mt = 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. [Figure not available: see fulltext.].