TY - JOUR
T1 - Precise measurement of the tt¯ production cross-section and lepton differential distributions in eμ dilepton events from s=13TeVpp collisions with the ATLAS detector
AU - ATLAS Collaboration
AU - Zwalinski, L.
AU - Zormpa, O.
AU - Zorbas, T. G.
AU - Zografos, A.
AU - Zoch, K.
AU - Zoccoli, A.
AU - Živković, L.
AU - Ziolkowski, M.
AU - Zinsser, J.
AU - Zimine, N. I.
AU - Zhukov, K.
AU - Zhuang, X.
AU - Zhu, Y.
AU - Zhu, Y.
AU - Zhu, X.
AU - Zhu, J.
AU - Zhou, Y.
AU - Zhou, Y.
AU - Zhou, Y.
AU - Zhou, N.
AU - Zhou, H.
AU - Zhou, B.
AU - Zhou, B.
AU - Zhong, D.
AU - Zheng, Z.
AU - Zheng, X.
AU - Zheng, K.
AU - Zheng, J.
AU - Zhemchugov, A.
AU - Zhao, Z.
AU - Zhao, Z.
AU - Zhao, Y.
AU - Zhao, T.
AU - Zhao, H.
AU - Zhang, Z.
AU - Zhang, Z.
AU - Zhang, Z.
AU - Zhang, Y.
AU - Zhang, Y.
AU - Zhang, Y.
AU - Zhang, Y.
AU - Zhang, T.
AU - Zhang, S.
AU - Zhang, R.
AU - Zhang, P.
AU - Zhang, L.
AU - Truong, L.
AU - Govender, N.
AU - Gololo, M. G.D.
AU - Connell, S. H.
N1 - Publisher Copyright:
© CERN for the benefit of the ATLAS Collaboration 2026.
PY - 2026/5
Y1 - 2026/5
N2 - The inclusive top quark pair (tt¯) cross-section σtt¯ has been measured in proton–proton collisions at s=13TeV, using 140fb-1 of data collected by the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge eμ pair and b-tagged jets, the cross-section is measured to be: (Formula presented.) 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 mtpole, giving mtpole=172.8-1.7+1.5 GeV. The same event sample is used to measure absolute and normalised differential cross-sections for the tt¯→eμνν¯bb¯ process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of eμbb¯ production, treating both tt¯ 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.
AB - The inclusive top quark pair (tt¯) cross-section σtt¯ has been measured in proton–proton collisions at s=13TeV, using 140fb-1 of data collected by the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge eμ pair and b-tagged jets, the cross-section is measured to be: (Formula presented.) 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 mtpole, giving mtpole=172.8-1.7+1.5 GeV. The same event sample is used to measure absolute and normalised differential cross-sections for the tt¯→eμνν¯bb¯ process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of eμbb¯ production, treating both tt¯ 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.
UR - https://www.scopus.com/pages/publications/105039876169
U2 - 10.1140/epjc/s10052-026-15311-0
DO - 10.1140/epjc/s10052-026-15311-0
M3 - Article
AN - SCOPUS:105039876169
SN - 1434-6044
VL - 86
JO - European Physical Journal C
JF - European Physical Journal C
IS - 5
M1 - 470
ER -