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

Anders, J.K.; Beck, H.P.; Ereditato, A.; Franconi, L.; Haug, S.; Ilg, A.; Miucci, A.; Weber, M.S.; Weston, T.D. (2023). Measurement of the top-quark mass using a leptonic invariant mass in pp collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics, 2023(6) Springer 10.1007/JHEP06(2023)019

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A measurement of the top-quark mass (mt) in the t¯t → 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 Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Anders, John Kenneth, Beck, Hans Peter, Ereditato, Antonio, Franconi, Laura, Haug, Sigve, Ilg, Armin, Miucci, Antonio, Weber, Michele, Weston, Thomas Daniel

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

08 Feb 2024 16:13

Last Modified:

30 Jun 2024 02:23

Publisher DOI:

10.1007/JHEP06(2023)019

Additional Information:

Kollaboration - Es sind nur die Berner Autor*innen namentlich erwaehnt; the ATLAS collaboration

Uncontrolled Keywords:

Hadron-Hadron Scattering , Top Physics

BORIS DOI:

10.48350/191901

URI:

https://boris.unibe.ch/id/eprint/191901

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