The inclusive top quark pair (tt¯) cross-section σtt¯ 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 eμ pair and b-tagged jets, the crosssection is measured to be: σtt¯ = 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 mpole t , giving mpolet = 172.8+1.5 −1.7 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 Powheg bb4l describe the data better than Powheg hvq

Precise measurement of the $$t\bar{t}$$ production cross-section and lepton differential distributions in $$ e\mu $$ dilepton events from $$\sqrt{s}=13\,\text {TeV}$$ pp collisions with the ATLAS detector / Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.J., Abidi, S.H., Aboelela, M., Aboulhorma, A., Abramowicz, H., Abulaiti, Y., Acharya, B.S., Ackermann, A., Adam Bourdarios, C., Adamczyk, L., Addepalli, S.V., Addison, M.J., Adelman, J., Adiguzel, A., et al.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 86:5(2026). [10.1140/epjc/s10052-026-15311-0]

Precise measurement of the $$t\bar{t}$$ production cross-section and lepton differential distributions in $$ e\mu $$ dilepton events from $$\sqrt{s}=13\,\text {TeV}$$ pp collisions with the ATLAS detector

Aloisio, A.;Alviggi, M.;Canale, V.;Casolaro, P.;Cirotto, F.;Della Pietra, M.;Massarotti, P.;Rossi, E.;
2026

Abstract

The inclusive top quark pair (tt¯) cross-section σtt¯ 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 eμ pair and b-tagged jets, the crosssection is measured to be: σtt¯ = 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 mpole t , giving mpolet = 172.8+1.5 −1.7 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 Powheg bb4l describe the data better than Powheg hvq
2026
Precise measurement of the $$t\bar{t}$$ production cross-section and lepton differential distributions in $$ e\mu $$ dilepton events from $$\sqrt{s}=13\,\text {TeV}$$ pp collisions with the ATLAS detector / Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.J., Abidi, S.H., Aboelela, M., Aboulhorma, A., Abramowicz, H., Abulaiti, Y., Acharya, B.S., Ackermann, A., Adam Bourdarios, C., Adamczyk, L., Addepalli, S.V., Addison, M.J., Adelman, J., Adiguzel, A., et al.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 86:5(2026). [10.1140/epjc/s10052-026-15311-0]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/1047254
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