Measurement of the top-quark mass using a leptonic invariant mass in <i>pp</i> collisions at √s=13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2887 more authors) (2023) Measurement of the top-quark mass using a leptonic invariant mass in <i>pp</i> collisions at √s=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2023 (6). 19-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A measurement of the top-quark mass (<jats:italic>m</jats:italic><jats:sub><jats:italic>t</jats:italic></jats:sub>) in the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ t\overline{t} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> → lepton + jets channel is presented, with an experimental technique which exploits semileptonic decays of <jats:italic>b</jats:italic>-hadrons produced in the top-quark decay chain. The distribution of the invariant mass <jats:italic>m</jats:italic><jats:sub><jats:italic>ℓμ</jats:italic></jats:sub> of the lepton, <jats:italic>ℓ</jats:italic> (with <jats:italic>ℓ</jats:italic> = <jats:italic>e, μ</jats:italic>), from the <jats:italic>W</jats:italic>-boson decay and the muon, <jats:italic>μ</jats:italic>, originating from the <jats:italic>b</jats:italic>-hadron decay is reconstructed, and a binned-template profile likelihood fit is performed to extract <jats:italic>m</jats:italic><jats:sub><jats:italic>t</jats:italic></jats:sub>. The measurement is based on data corresponding to an integrated luminosity of 36.1 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup> of <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 13 TeV <jats:italic>pp</jats:italic> collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. The measured value of the top-quark mass is <jats:italic>m</jats:italic><jats:sub><jats:italic>t</jats:italic></jats:sub> = 174<jats:italic>.</jats:italic>41 ± 0<jats:italic>.</jats:italic>39 (stat.) ± 0<jats:italic>.</jats:italic>66 (syst.) ± 0<jats:italic>.</jats:italic>25 (recoil) GeV, where the third uncertainty arises from changing the P<jats:sc>ythia</jats:sc>8 parton shower gluon-recoil scheme, used in top-quark decays, to a recently developed setup.</jats:p>

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron Scattering, Top Physics
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 27 Jun 2023 16:23
Last Modified: 16 Mar 2024 02:46
DOI: 10.1007/JHEP06(2023)019
Open Access URL: https://link.springer.com/article/10.1007/JHEP06(2...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3171331