Measurement of the top-quark pole mass in dileptonic 𝒕 ¯𝒕 + 1-jet events at √𝒔 = 13 TeV with the ATLAS experiment

ATLAS Collaboration; Usha Mallik

doi:10.48550/arXiv.2507.02632

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Measurement of the top-quark pole mass in dileptonic 𝒕 ¯𝒕 + 1-jet events at √𝒔 = 13 TeV with the ATLAS experiment

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Measurement of the top-quark pole mass in dileptonic 𝒕 ¯𝒕 + 1-jet events at √𝒔 = 13 TeV with the ATLAS experiment

ATLAS Collaboration and Usha Mallik

ArXiV.org

Cornell University

07/04/2025

DOI: 10.48550/arXiv.2507.02632

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Preprint (Author's original) This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

A measurement of the top-quark pole mass 𝑚pole 𝑡 is presented in 𝑡 ¯𝑡 events with an additional jet, 𝑡 ¯𝑡 + 1-jet , produced in 𝑝 𝑝 collisions at √𝑠 = 13 TeV. The data sample, recorded with the ATLAS experiment during Run 2 of the LHC, corresponds to an integrated luminosity of 140 fb−1. Events with one electron and one muon of opposite electric charge in the final state are selected to measure the 𝑡 ¯𝑡 + 1-jet differential cross-section as a function of the inverse of the invariant mass of the 𝑡 ¯𝑡 + 1-jet system. Iterative Bayesian Unfolding is used to correct the data to enable comparison with fixed-order calculations at next-to-leading-order accuracy in the strong coupling. The process 𝑝 𝑝 → 𝑡 ¯𝑡 𝑗 (2 → 3), where top quarks are taken as stable particles, and the process 𝑝 𝑝 → 𝑏 ¯𝑏𝑙+𝜈𝑙− ¯𝜈 𝑗 (2 → 7), which includes top-quark decays to the dilepton final state and off-shell effects, are considered. The top-quark mass is extracted using a 𝜒2 fit of the unfolded normalized differential cross-section distribution. The results obtained with the 2 → 3 and 2 → 7 calculations are compatible within theoretical uncertainties, providing an important consistency check. The more precise determination is obtained for the 2 → 3 measurement: 𝑚pole 𝑡 = 170.7 ± 0.3 (stat.) ± 1.4 (syst.) ± 0.3 (scale) ± 0.2 (PDF ⊕ 𝛼S) GeV, which is in good agreement with other top-quark mass results.

Details

Title: Subtitle: Measurement of the top-quark pole mass in dileptonic 𝒕 ¯𝒕 + 1-jet events at √𝒔 = 13 TeV with the ATLAS experiment
Creators: ATLAS Collaboration
Usha Mallik (Contributor)
Resource Type: Preprint
Publication Details: ArXiV.org
DOI: 10.48550/arXiv.2507.02632
ISSN: 2331-8422
Publisher: Cornell University; Ithaca, New York
Language: English
Date posted: 07/04/2025
Academic Unit: Physics and Astronomy
Record Identifier: 9984848109802771

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