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

ATLAS Collaboration

Preprint

PUBDB-2022-05078

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

ATLAS Collaboration (Collaboration author)DESY*

2022

[10.3204/PUBDB-2022-05078]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-05078

Report No.: CERN-EP-2020-018; arXiv:2209.00583

Abstract: A measurement of the top-quark mass ($m_t$) in the $t\bar{t}\rightarrow~\textrm{lepton}+\textrm{jets}$ 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~\textrm{TeV}$$pp$ collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. The measured value of the top-quark mass is $m_{t} = 174.41\pm0.39~(\textrm{stat.})\pm0.66~(\textrm{syst.})\pm0.25~(\textrm{recoil})~\textrm{GeV}$, where the third uncertainty arises from changing the PYTHIA8 parton shower gluon-recoil scheme, used in top-quark decays, to a recently developed setup.

Keyword(s): 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

Note: 32 pages in total, 9 figures, 6 tables, to be submitted to JHEP. All figures including auxiliary figures are available at: https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2017-17/

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