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

Abstract

A measurement of the top-quark mass ($m_t$) in the $t\bar{t}\to \text{lepton}+\text{jets}$ 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 $m_{\ell \mu }$ of the lepton, $\ell$ (with $\ell =e,\mu$), from the $W$-boson decay and the muon, $\mu$, 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 $\sqrt{s}=13\text{TeV}$ $pp$ collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. The measured value of the top-quark mass is $m_t=174.41\pm 0.39(\text{stat.})\pm 0.66(\text{syst.})\pm 0.25(\text{recoil})\text{GeV}$, where the third uncertainty arises from changing the PYTHIA8 parton shower gluon-recoil scheme, used in top-quark decays, to a recently developed setup.

54 pages in total, author list starting page 37, 9 figures, 6 tables, published in JHEP 06 (2023) 019. All figures including auxiliary figures are available at: https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2017-17/

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• Search for flavor-changing neutral-current couplings between the top quark and the $Z$ boson with proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Reconstruction of Unstable Heavy Particles Using Deep Symmetry-Preserving Attention Networks