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Inclusive and diffe...
Inclusive and differential cross-section measurements of tt¯Z production in pp collisions at s = 13 TeV with the ATLAS detector, including EFT and spin-correlation interpretations
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- Aad, G. (author)
- CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
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- Leopold, Alexander (author)
- KTH,Partikelfysik, astrofysik och medicinsk bildbehandling
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- Lundberg, Olof (author)
- KTH,Partikelfysik, astrofysik och medicinsk bildbehandling
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- Lund-Jensen, Bengt, 1954-2023 (author)
- KTH,Partikelfysik, astrofysik och medicinsk bildbehandling
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- Ohm, Christian (author)
- KTH,Partikelfysik, astrofysik och medicinsk bildbehandling
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- $$$Shaheen, R. (author)
- Department of Physics, Royal Institute of Technology, Stockholm, Sweden
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- Strandberg, Jonas (author)
- KTH,Partikelfysik, astrofysik och medicinsk bildbehandling
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- Zwalinski, L. (author)
- CERN, Geneva, Switzerland
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(creator_code:org_t)
- Springer Nature, 2024
- 2024
- English.
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In: Journal of High Energy Physics (JHEP). - : Springer Nature. - 1126-6708 .- 1029-8479. ; 2024:7
- Related links:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Measurements of both the inclusive and differential production cross sections of a top-quark-top-antiquark pair in association with a Z boson (tt¯Z) are presented. Final states with two, three or four isolated leptons (electrons or muons) are targeted. The measurements use the data recorded by the ATLAS detector in pp collisions at s = 13 TeV at the Large Hadron Collider during the years 2015–2018, corresponding to an integrated luminosity of 140 fb−1. The inclusive cross section is measured to be σtt¯Z = 0.86 ± 0.04 (stat.) ± 0.04 (syst.) pb and found to be in agreement with the most advanced Standard Model predictions. The differential measurements are presented as a function of a number of observables that probe the kinematics of the tt¯Z system. Both the absolute and normalised differential cross-section measurements are performed at particle level and parton level for specific fiducial volumes, and are compared with NLO+NNLL theoretical predictions. The results are interpreted in the framework of Standard Model effective field theory and used to set limits on a large number of dimension-6 operators involving the top quark. The first measurement of spin correlations in tt¯Z events is presented: the results are in agreement with the Standard Model expectations, and the null hypothesis of no spin correlations is disfavoured with a significance of 1.8 standard deviations.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Keyword
- Hadron-Hadron Scattering
- Top Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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