Observation of t¯t production in the lepton+jets and dilepton channels in p+Pb collisions at √sNN = 8.16 TeV with the ATLAS detector

ATLAS Collaboration; S. Alderweireldt; J.F. Allen; T.M. Carter; P. J.  Clark; J.R. Curran; D. Duda; S. M. Farrington; Y. Gao; J.M. Gargan; R.Y. Gonzalez Andana; C. Jiang; C. Leonidopoulos; M. Firdaus M. Soberi; V. J.  Martin; L. Mijović; V.A. Parrish; E.A. Pender; T. Qiu; J.M. Silva; N. Themistokleous; E.M. Villhauer; B.M. Wynne; Z. Xu; E. Zaid

doi:10.1007/JHEP11(2024)101

Observation of t¯t production in the lepton+jets and dilepton channels in p+Pb collisions at √sNN = 8.16 TeV with the ATLAS detector

ATLAS Collaboration, S. Alderweireldt, J.F. Allen, T.M. Carter, P. J. Clark, J.R. Curran, D. Duda, S. M. Farrington, Y. Gao, J.M. Gargan, R.Y. Gonzalez Andana, C. Jiang, C. Leonidopoulos, M. Firdaus M. Soberi, V. J. Martin, L. Mijović, V.A. Parrish, E.A. Pender, T. Qiu, J.M. SilvaN. Themistokleous, E.M. Villhauer, B.M. Wynne, Z. Xu, E. Zaid

School of Physics and Astronomy

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

Abstract

This paper reports the observation of top-quark pair production in proton-lead
collisions in the ATLAS experiment at the Large Hadron Collider. The measurement is
performed using 165 nb−1 of p+Pb data collected at √sNN = 8.16 TeV in 2016. Events are categorised in two analysis channels, consisting of either events with exactly one lepton (electron or muon) and at least four jets, or events with two opposite-charge leptons and at least two jets. In both channels at least one b-tagged jet is also required. Top-quark pair production is observed with a significance over five standard deviations in each channel. The top-quark pair production cross-section is measured to be σt¯t = 58.1 ± 2.0 (stat.) +4.8−4.4 (syst.) nb, with a total uncertainty of 9%. In addition, the nuclear modification factor is measured to be RpA = 1.090 ± 0.039 ( stat.) +0.094−0.087 ( syst.). The measurements are found to be in good agreement with theory predictions involving nuclear parton distribution functions.

Original language	English
Article number	101
Pages (from-to)	1-37
Number of pages	37
Journal	Journal of High Energy Physics
Volume	2024
Issue number	11
DOIs	https://doi.org/10.1007/JHEP11(2024)101
Publication status	Published - 19 Nov 2024

Keywords / Materials (for Non-textual outputs)

Heavy Ion Experiments
Top Physics

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10.1007/JHEP11(2024)101Licence: Creative Commons: Attribution (CC-BY)

3 Finished
3 Active

Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/27
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 31/03/26
Project: Research

Cite this

ATLAS Collaboration, Alderweireldt, S., Allen, J. F., Carter, T. M., Clark, P. J., Curran, J. R., Duda, D., Farrington, S. M., Gao, Y., Gargan, J. M., Gonzalez Andana, R. Y., Jiang, C., Leonidopoulos, C., Soberi, M. F. M., Martin, V. J., Mijović, L., Parrish, V. A., Pender, E. A., Qiu, T., ... Zaid, E. (2024). Observation of t¯t production in the lepton+jets and dilepton channels in p+Pb collisions at √sNN = 8.16 TeV with the ATLAS detector. Journal of High Energy Physics, 2024(11), 1-37. Article 101. https://doi.org/10.1007/JHEP11(2024)101

@article{031ce101c0e64eaf8f7e321f30ce8a32,

title = "Observation of t¯t production in the lepton+jets and dilepton channels in p+Pb collisions at √sNN = 8.16 TeV with the ATLAS detector",

abstract = "This paper reports the observation of top-quark pair production in proton-leadcollisions in the ATLAS experiment at the Large Hadron Collider. The measurement isperformed using 165 nb−1 of p+Pb data collected at √sNN = 8.16 TeV in 2016. Events are categorised in two analysis channels, consisting of either events with exactly one lepton (electron or muon) and at least four jets, or events with two opposite-charge leptons and at least two jets. In both channels at least one b-tagged jet is also required. Top-quark pair production is observed with a significance over five standard deviations in each channel. The top-quark pair production cross-section is measured to be σt¯t = 58.1 ± 2.0 (stat.) +4.8−4.4 (syst.) nb, with a total uncertainty of 9%. In addition, the nuclear modification factor is measured to be RpA = 1.090 ± 0.039 ( stat.) +0.094−0.087 ( syst.). The measurements are found to be in good agreement with theory predictions involving nuclear parton distribution functions.",

keywords = "Heavy Ion Experiments, Top Physics",

author = "{ATLAS Collaboration} and S. Alderweireldt and J.F. Allen and T.M. Carter and Clark, {P. J.} and J.R. Curran and D. Duda and Farrington, {S. M.} and Y. Gao and J.M. Gargan and {Gonzalez Andana}, R.Y. and C. Jiang and C. Leonidopoulos and Soberi, {M. Firdaus M.} and Martin, {V. J.} and L. Mijovi{\'c} and V.A. Parrish and E.A. Pender and T. Qiu and J.M. Silva and N. Themistokleous and E.M. Villhauer and B.M. Wynne and Z. Xu and E. Zaid",

year = "2024",

month = nov,

day = "19",

doi = "10.1007/JHEP11(2024)101",

language = "English",

volume = "2024",

pages = "1--37",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

number = "11",

}

ATLAS Collaboration, Alderweireldt, S, Allen, JF, Carter, TM, Clark, PJ, Curran, JR, Duda, D , Farrington, SM , Gao, Y, Gargan, JM, Gonzalez Andana, RY, Jiang, C, Leonidopoulos, C, Soberi, MFM, Martin, VJ , Mijović, L, Parrish, VA, Pender, EA, Qiu, T , Silva, JM, Themistokleous, N, Villhauer, EM, Wynne, BM , Xu, Z & Zaid, E 2024, 'Observation of t¯t production in the lepton+jets and dilepton channels in p+Pb collisions at √sNN = 8.16 TeV with the ATLAS detector', Journal of High Energy Physics, vol. 2024, no. 11, 101, pp. 1-37. https://doi.org/10.1007/JHEP11(2024)101

TY - JOUR

T1 - Observation of t¯t production in the lepton+jets and dilepton channels in p+Pb collisions at √sNN = 8.16 TeV with the ATLAS detector

AU - ATLAS Collaboration

AU - Alderweireldt, S.

AU - Allen, J.F.

AU - Carter, T.M.

AU - Clark, P. J.

AU - Curran, J.R.

AU - Duda, D.

AU - Farrington, S. M.

AU - Gao, Y.

AU - Gargan, J.M.

AU - Gonzalez Andana, R.Y.

AU - Jiang, C.

AU - Leonidopoulos, C.

AU - Soberi, M. Firdaus M.

AU - Martin, V. J.

AU - Mijović, L.

AU - Parrish, V.A.

AU - Pender, E.A.

AU - Qiu, T.

AU - Silva, J.M.

AU - Themistokleous, N.

AU - Villhauer, E.M.

AU - Wynne, B.M.

AU - Xu, Z.

AU - Zaid, E.

PY - 2024/11/19

Y1 - 2024/11/19

N2 - This paper reports the observation of top-quark pair production in proton-leadcollisions in the ATLAS experiment at the Large Hadron Collider. The measurement isperformed using 165 nb−1 of p+Pb data collected at √sNN = 8.16 TeV in 2016. Events are categorised in two analysis channels, consisting of either events with exactly one lepton (electron or muon) and at least four jets, or events with two opposite-charge leptons and at least two jets. In both channels at least one b-tagged jet is also required. Top-quark pair production is observed with a significance over five standard deviations in each channel. The top-quark pair production cross-section is measured to be σt¯t = 58.1 ± 2.0 (stat.) +4.8−4.4 (syst.) nb, with a total uncertainty of 9%. In addition, the nuclear modification factor is measured to be RpA = 1.090 ± 0.039 ( stat.) +0.094−0.087 ( syst.). The measurements are found to be in good agreement with theory predictions involving nuclear parton distribution functions.

AB - This paper reports the observation of top-quark pair production in proton-leadcollisions in the ATLAS experiment at the Large Hadron Collider. The measurement isperformed using 165 nb−1 of p+Pb data collected at √sNN = 8.16 TeV in 2016. Events are categorised in two analysis channels, consisting of either events with exactly one lepton (electron or muon) and at least four jets, or events with two opposite-charge leptons and at least two jets. In both channels at least one b-tagged jet is also required. Top-quark pair production is observed with a significance over five standard deviations in each channel. The top-quark pair production cross-section is measured to be σt¯t = 58.1 ± 2.0 (stat.) +4.8−4.4 (syst.) nb, with a total uncertainty of 9%. In addition, the nuclear modification factor is measured to be RpA = 1.090 ± 0.039 ( stat.) +0.094−0.087 ( syst.). The measurements are found to be in good agreement with theory predictions involving nuclear parton distribution functions.

KW - Heavy Ion Experiments

KW - Top Physics

U2 - 10.1007/JHEP11(2024)101

DO - 10.1007/JHEP11(2024)101

M3 - Article

SN - 1126-6708

VL - 2024

SP - 1

EP - 37

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 11

M1 - 101

ER -

Observation of t¯t production in the lepton+jets and dilepton channels in p+Pb collisions at √sNN = 8.16 TeV with the ATLAS detector

Abstract

Keywords / Materials (for Non-textual outputs)

Access to Document

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Projects

Upgrade of the ATLAS detector at the LHC (2023-26)

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Cite this