Precise measurement of the tt¯ production cross-section and lepton differential distributions in eμ dilepton events from s=13TeVpp collisions with the ATLAS detector.
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| Title: | Precise measurement of the tt¯ production cross-section and lepton differential distributions in eμ dilepton events from s=13TeVpp collisions with the ATLAS detector. |
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| Authors: | Aad, G.1 (AUTHOR), Aakvaag, E.2 (AUTHOR), Abbott, B.3 (AUTHOR), Abdelhameed, S.4 (AUTHOR), Abeling, K.5 (AUTHOR), Abicht, N. J.6 (AUTHOR), Abidi, S. H.7 (AUTHOR), Aboelela, M.8 (AUTHOR), Aboulhorma, A.9 (AUTHOR), Abramowicz, H.10 (AUTHOR), Abulaiti, Y.11 (AUTHOR), Acharya, B. S.12,13,14 (AUTHOR), Ackermann, A.15 (AUTHOR), Adam Bourdarios, C.16 (AUTHOR), Adamczyk, L.17 (AUTHOR), Addepalli, S. V.18 (AUTHOR), Addison, M. J.19 (AUTHOR), Adelman, J.20 (AUTHOR), Adiguzel, A.21 (AUTHOR), Adye, T.22 (AUTHOR) |
| Source: | European Physical Journal C -- Particles & Fields. May2026, Vol. 86 Issue 5, p1-54. 54p. |
| Subjects: | Top quarks, Measurement, Proton-proton interactions, Monte Carlo method, Large Hadron Collider, Particle detectors, Lepton number |
| Abstract: | The inclusive top quark pair ( t t ¯ ) cross-section σ t t ¯ has been measured in proton–proton collisions at s = 13 TeV , using 140 fb - 1 of data collected by the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge e μ pair and b-tagged jets, the cross-section is measured to be: σ t t ¯ = 829.3 ± 1.3 (stat) ± 8.0 (syst) ± 7.3 (lumi) ± 1.9 (beam) pb , where the uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, the integrated luminosity, and the proton beam energy, giving a total uncertainty of 1.3%. The result is used to determine the top quark pole mass via the dependence of the predicted cross-section on m t pole , giving m t pole = 172. 8 - 1.7 + 1.5 GeV. The same event sample is used to measure absolute and normalised differential cross-sections for the t t ¯ → e μ ν ν ¯ b b ¯ process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of e μ b b ¯ production, treating both t t ¯ and Wt events as signal, are also provided. Both sets of differential cross-sections are compared to the predictions of various Monte Carlo event generators, demonstrating that the state-of-the-art generators Powheg MiNNLO and Powhegbb4l describe the data better than Powheghvq. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The inclusive top quark pair ( t t ¯ ) cross-section σ t t ¯ has been measured in proton–proton collisions at s = 13 TeV , using 140 fb - 1 of data collected by the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge e μ pair and b-tagged jets, the cross-section is measured to be: σ t t ¯ = 829.3 ± 1.3 (stat) ± 8.0 (syst) ± 7.3 (lumi) ± 1.9 (beam) pb , where the uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, the integrated luminosity, and the proton beam energy, giving a total uncertainty of 1.3%. The result is used to determine the top quark pole mass via the dependence of the predicted cross-section on m t pole , giving m t pole = 172. 8 - 1.7 + 1.5 GeV. The same event sample is used to measure absolute and normalised differential cross-sections for the t t ¯ → e μ ν ν ¯ b b ¯ process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of e μ b b ¯ production, treating both t t ¯ and Wt events as signal, are also provided. Both sets of differential cross-sections are compared to the predictions of various Monte Carlo event generators, demonstrating that the state-of-the-art generators Powheg MiNNLO and Powhegbb4l describe the data better than Powheghvq. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 14346044 |
| DOI: | 10.1140/epjc/s10052-026-15311-0 |
