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

Abstract

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 m`µ of the lepton, ` (with ` = 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.

Item Metadata

Title
Measurement of the top-quark mass using a leptonic invariant mass in pp collisions at √s = 13 TeV with the ATLAS detector
Creator
ATLAS Collaboration
Publisher
Springer Berlin Heidelberg
Date Issued
2023-06-05
Description
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 m`µ of the lepton, ` (with ` = 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.
Subject
Hadron-Hadron Scattering; Top Physics
Genre
Article
Type
Text
Language
eng
Date Available
2023-09-12
Provider
Vancouver : University of British Columbia Library
Rights
Attribution 4.0 International (CC BY 4.0)
DOI
10.14288/1.0435853
URI
http://hdl.handle.net/2429/85896
Affiliation
Science, Faculty of; TRIUMF; Non UBC; Physics and Astronomy, Department of
Citation
Journal of High Energy Physics. 2023 Jun 05;2023(6):19
Publisher DOI
10.1007/JHEP06(2023)019
Peer Review Status
Reviewed
Scholarly Level
Faculty; Researcher
Copyright Holder
The Author(s)
Rights URI
http://creativecommons.org/licenses/by/4.0/
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DSpace

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Attribution 4.0 International (CC BY 4.0)