Observation of t t Â¯ production in the lepton+jets and dilepton channels in p +Pb collisions at s NN = 8. 16 TeV with the ATLAS detector

Physics

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Experimental Particle Physics

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https://doi.org/10.1007/jhep11(2024)101
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Available under license: CC BY: Creative Commons Attribution 4.0 International License

Keywords

Top Physics, Heavy Ion Experiments

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Observation of t t Â¯ production in the lepton+jets and dilepton channels in p +Pb collisions at s NN = 8. 16 TeV with the ATLAS detector. / The ATLAS collaboration.
In: Journal of High Energy Physics, Vol. 2024, No. 11, 101, 19.11.2024.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{cbfe7c0f927a49cabad86595fc7acad8,

title = "Observation of t t {\^A}¯ production in the lepton+jets and dilepton channels in p +Pb collisions at s NN = 8. 16 TeV with the ATLAS detector",

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{\^a}ˆ{\textquoteright}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 {\"I}ƒtt{\^A}¯=58.1{\^A}±2.0stat.{\^a}ˆ{\textquoteright}4.4+4.8syst. nb, with a total uncertainty of 9%. In addition, the nuclear modification factor is measured to be RpA=1.090{\^A}±0.039stat.{\^a}ˆ{\textquoteright}0.087+0.094syst.. The measurements are found to be in good agreement with theory predictions involving nuclear parton distribution functions.",

keywords = "Top Physics, Heavy Ion Experiments",

author = "{The ATLAS collaboration} and Hanadi Ali and Zainab Alsolami and A.E. Barton and G. Borissov and E.V. Bouhova-Thacker and Ruby Ferguson and James Ferrando and H. Fox and Alina Hagan and R.C.W. Henderson and R.W.L. Jones and V. Kartvelishvili and P.A. Love and E.J. Marshall and L. Meng and D. Muenstermann and N. Ribaric and Elliot Sampson and M. Smizanska and S. Spinali and A.M. Wharton",

year = "2024",

month = nov,

day = "19",

doi = "10.1007/jhep11(2024)101",

language = "English",

volume = "2024",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer-Verlag",

number = "11",

}

RIS

TY - JOUR

T1 - Observation of t t Â¯ production in the lepton+jets and dilepton channels in p +Pb collisions at s NN = 8. 16 TeV with the ATLAS detector

AU - The ATLAS collaboration

AU - Ali, Hanadi

AU - Alsolami, Zainab

AU - Barton, A.E.

AU - Borissov, G.

AU - Bouhova-Thacker, E.V.

AU - Ferguson, Ruby

AU - Ferrando, James

AU - Fox, H.

AU - Hagan, Alina

AU - Henderson, R.C.W.

AU - Jones, R.W.L.

AU - Kartvelishvili, V.

AU - Love, P.A.

AU - Marshall, E.J.

AU - Meng, L.

AU - Muenstermann, D.

AU - Ribaric, N.

AU - Sampson, Elliot

AU - Smizanska, M.

AU - Spinali, S.

AU - Wharton, A.M.

PY - 2024/11/19

Y1 - 2024/11/19

N2 - 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 nbâˆ’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 ÏƒttÂ¯=58.1Â±2.0stat.âˆ’4.4+4.8syst. nb, with a total uncertainty of 9%. In addition, the nuclear modification factor is measured to be RpA=1.090Â±0.039stat.âˆ’0.087+0.094syst.. 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-lead collisions in the ATLAS experiment at the Large Hadron Collider. The measurement is performed using 165 nbâˆ’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 ÏƒttÂ¯=58.1Â±2.0stat.âˆ’4.4+4.8syst. nb, with a total uncertainty of 9%. In addition, the nuclear modification factor is measured to be RpA=1.090Â±0.039stat.âˆ’0.087+0.094syst.. The measurements are found to be in good agreement with theory predictions involving nuclear parton distribution functions.

KW - Top Physics

KW - Heavy Ion Experiments

U2 - 10.1007/jhep11(2024)101

DO - 10.1007/jhep11(2024)101

M3 - Journal article

VL - 2024

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 11

M1 - 101

ER -

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