A measurement of the top-quark pole mass m_pole^ t is presented in tbar t events with an additional jet, tbar t +1-jet, produced in pp collisions at root(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 tbar t + 1-jet differential cross-section as a function of the inverse of the invariant mass of the tbar 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 pp -> tbar t j (2 -> 3), where top quarks are taken as stable particles, and the process pp -> bbar b l+nu l- nubar 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 chi square 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: m_pole^t = 170.7+-0.3 (stat.)+-1.4 (syst.)+-0.3 (scale)+-0.2 (PDF and αS) GeV, which is in good agreement with other top-quark mass results.

Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2025). Measurement of the top-quark pole mass in dileptonic $$ t\overline{t} $$ + 1-jet events at $$ \sqrt{s}=13 $$ TeV with the ATLAS experiment. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12) [10.1007/jhep12(2025)023].

Measurement of the top-quark pole mass in dileptonic $$ t\overline{t} $$ + 1-jet events at $$ \sqrt{s}=13 $$ TeV with the ATLAS experiment

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;Giuli, F.;
2025-01-01

Abstract

A measurement of the top-quark pole mass m_pole^ t is presented in tbar t events with an additional jet, tbar t +1-jet, produced in pp collisions at root(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 tbar t + 1-jet differential cross-section as a function of the inverse of the invariant mass of the tbar 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 pp -> tbar t j (2 -> 3), where top quarks are taken as stable particles, and the process pp -> bbar b l+nu l- nubar 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 chi square 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: m_pole^t = 170.7+-0.3 (stat.)+-1.4 (syst.)+-0.3 (scale)+-0.2 (PDF and αS) GeV, which is in good agreement with other top-quark mass results.
2025
Pubblicato
Rilevanza internazionale
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Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2025). Measurement of the top-quark pole mass in dileptonic $$ t\overline{t} $$ + 1-jet events at $$ \sqrt{s}=13 $$ TeV with the ATLAS experiment. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12) [10.1007/jhep12(2025)023].
Null, N; Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, Nj; Abidi, Sh; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y; Ach...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/441865
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