Precise measurement of the tt̄ production cross-section and lepton differential distributions in eμ dilepton events from √s = 13 TeV pp collisions with the ATLAS detector

ATLAS Collaboration

Precise measurement of the tt̄ production cross-section and lepton differential distributions in eμ dilepton events from √s = 13 TeV pp collisions with the ATLAS detector

ATLAS Collaboration

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

The inclusive top quark pair (t

t̄

) cross-section σ_t

_{_t̄}

has been measured in √s = 13 TeV proton-proton collisions, 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 cross-section is measured to be:

σ_t

_{_t̄}

= 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^pole_t, giving m^pole_t = 172.8^+1.5_−1.7 GeV. The same event sample is used to measure absolute and normalised differential cross-sections for the t

t̄

→ eμν

ν̄nu bar

𝜈̄

b

b̄b bar

𝑏̄

process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of

eμb

b̄b bar

𝑏̄

production, treating both t

t̄

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.

Original language	English
Journal	European Physical Journal C
Publication status	Accepted/In press - 22 Jan 2026

Bibliographical note

Not yet published as of 02/03/2026.

69 pages in total, author list starting page 52, 19 figures, 8 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2024-12/

Keywords

hep-ex

Cite this

@article{69bee8b851874a16a7c97d85439a9567,

title = "Precise measurement of the t{\=t} production cross-section and lepton differential distributions in eμ dilepton events from √s = 13 TeV pp collisions with the ATLAS detector ",

abstract = "The inclusive top quark pair (t{\=t}{\=t} ) cross-section σt{\=t}{\=t} has been measured in √s = 13 TeV proton-proton collisions, 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 cross-section is measured to be: σt{\=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 mpolet, 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 t{\=t}{\=t} → eμν{\=ν}nu bar{\=}b{\=b}b bar{\=} process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of eμb{\=b}b bar{\=}production, treating both t{\=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 Powheg bb4l describe the data better than Powheg hvq.",

keywords = "hep-ex",

author = "\{ATLAS Collaboration\} and P.P. Allport and P. Bellos and I. Benaoumeur and J. Bracinik and D.G. Charlton and A.S. Chisholm and A. Dimitrievska and L. Gonella and F. Gonnella and C.M. Hawkes and S.J. Hillier and K. Krizka and E.H.L. Liu and J.D. Lomas and T.J. Neep and P.R. Newman and E. Skorda and J.P. Thomas and P.D. Thompson and A.T. Watson and M.F. Watson and C. Wu",

note = "Not yet published as of 02/03/2026. 69 pages in total, author list starting page 52, 19 figures, 8 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2024-12/",

year = "2026",

month = jan,

day = "22",

language = "English",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer",

}

TY - JOUR

T1 - Precise measurement of the tt̄ production cross-section and lepton differential distributions in eμ dilepton events from √s = 13 TeV pp collisions with the ATLAS detector

AU - ATLAS Collaboration

AU - Allport, P.P.

AU - Bellos, P.

AU - Benaoumeur, I.

AU - Bracinik, J.

AU - Charlton, D.G.

AU - Chisholm, A.S.

AU - Dimitrievska, A.

AU - Gonella, L.

AU - Gonnella, F.

AU - Hawkes, C.M.

AU - Hillier, S.J.

AU - Krizka, K.

AU - Liu, E.H.L.

AU - Lomas, J.D.

AU - Neep, T.J.

AU - Newman, P.R.

AU - Skorda, E.

AU - Thomas, J.P.

AU - Thompson, P.D.

AU - Watson, A.T.

AU - Watson, M.F.

AU - Wu, C.

N1 - Not yet published as of 02/03/2026. 69 pages in total, author list starting page 52, 19 figures, 8 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2024-12/

PY - 2026/1/22

Y1 - 2026/1/22

N2 - The inclusive top quark pair (tt̄t̄ ) cross-section σtt̄t̄ has been measured in √s = 13 TeV proton-proton collisions, 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 cross-section is measured to be: σtt̄t̄ = 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 mpolet, 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 tt̄t̄ → eμνν̄nu bar𝜈̄bb̄b bar𝑏̄ process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of eμbb̄b bar𝑏̄production, treating both tt̄t̄ 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.

AB - The inclusive top quark pair (tt̄t̄ ) cross-section σtt̄t̄ has been measured in √s = 13 TeV proton-proton collisions, 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 cross-section is measured to be: σtt̄t̄ = 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 mpolet, 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 tt̄t̄ → eμνν̄nu bar𝜈̄bb̄b bar𝑏̄ process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of eμbb̄b bar𝑏̄production, treating both tt̄t̄ 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.

KW - hep-ex

UR - https://link.springer.com/journal/10052

M3 - Article

SN - 1434-6044

JO - European Physical Journal C

JF - European Physical Journal C

ER -

Precise measurement of the tt̄ production cross-section and lepton differential distributions in eμ dilepton events from √s = 13 TeV pp collisions with the ATLAS detector

Abstract

Bibliographical note

Keywords

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