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dc.contributor.authorATLAS Collaboration
dc.date.accessioned2022-08-25T00:52:05Z
dc.date.available2022-08-25T00:52:05Z
dc.date.issued2022
dc.identifier.citationAad, G., Abbott, B., Abbott, D. C., Abud, A. A., Abeling, K., Abhayasinghe, D. K., Abidi, S. H., Aboulhorma, A., Abramowicz, H., Abreu, H., Abulaiti, Y., Hoffman, A. C. A., Acharya, B. S., Achkar, B., Adam, L., Bourdarios, C. A., Adamczyk, L., Adamek, L., Addepalli, S. V., … ATLAS Collaboration. (2022a). Measurement of the energy asymmetry in tt¯ j production at 13 TeV with the ATLAS experiment and interpretation in the SMEFT framework. European Physical Journal C, 82(4).
dc.identifier.issn1434-6044
dc.identifier.doi10.1140/epjc/s10052-022-10101-w
dc.identifier.urihttp://hdl.handle.net/10150/665938
dc.description.abstractA measurement of the energy asymmetry in jet-associated top-quark pair production is presented using 139fb-1 of data collected by the ATLAS detector at the Large Hadron Collider during pp collisions at s=13TeV. The observable measures the different probability of top and antitop quarks to have the higher energy as a function of the jet scattering angle with respect to the beam axis. The energy asymmetry is measured in the semileptonic tt¯ decay channel, and the hadronically decaying top quark must have transverse momentum above 350GeV. The results are corrected for detector effects to particle level in three bins of the scattering angle of the associated jet. The measurement agrees with the SM prediction at next-to-leading-order accuracy in quantum chromodynamics in all three bins. In the bin with the largest expected asymmetry, where the jet is emitted perpendicular to the beam, the energy asymmetry is measured to be - 0.043 ± 0.020 , in agreement with the SM prediction of - 0.037 ± 0.003. Interpreting this result in the framework of the Standard Model effective field theory (SMEFT), it is shown that the energy asymmetry is sensitive to the top-quark chirality in four-quark operators and is therefore a valuable new observable in global SMEFT fits. © 2022, The Author(s).
dc.language.isoen
dc.publisherSpringer Science and Business Media Deutschland GmbH
dc.rightsCopyright © CERN for the benefit of the ATLAS collaboration 2022. This article is licensed under a Creative Commons Attribution 4.0 International License.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleMeasurement of the energy asymmetry in tt¯ j production at 13 TeV with the ATLAS experiment and interpretation in the SMEFT framework
dc.typeArticle
dc.typetext
dc.contributor.departmentDepartment of Physics, University of Arizona
dc.identifier.journalEuropean Physical Journal C
dc.description.noteOpen access journal
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
dc.eprint.versionFinal published version
dc.source.journaltitleEuropean Physical Journal C
refterms.dateFOA2022-08-25T00:52:05Z


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Copyright © CERN for the benefit of the ATLAS collaboration 2022. This article is licensed under a Creative Commons Attribution 4.0 International License.
Except where otherwise noted, this item's license is described as Copyright © CERN for the benefit of the ATLAS collaboration 2022. This article is licensed under a Creative Commons Attribution 4.0 International License.