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Studies of the energy dependence of diboson polarization fractions and the radiation-amplitude-zero effect in WZ production with the ATLAS Detector

This Letter presents the first study of the energy dependence of diboson polarization fractions in π‘Šβ’π‘β†’β„“β‘πœˆβ’β„“β€²β‘β„“β€²β‘(β„“,β„“β€²=𝑒,πœ‡) production. The dataset used corresponds to an integrated luminosity of 140 fbβˆ’1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Sanfilippo, Lorenzo (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Vigani, Luigi (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 5 September 2024
In: Physical review letters
Year: 2024, Volume: 133, Issue: 10, Pages: 1-24
ISSN:1079-7114
DOI:10.1103/PhysRevLett.133.101802
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.133.101802
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.133.101802
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Author Notes:G. Aad et al. (ATLAS Collaboration)
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Summary:This Letter presents the first study of the energy dependence of diboson polarization fractions in π‘Šβ’π‘β†’β„“β‘πœˆβ’β„“β€²β‘β„“β€²β‘(β„“,β„“β€²=𝑒,πœ‡) production. The dataset used corresponds to an integrated luminosity of 140 fbβˆ’1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector. Two fiducial regions with an enhanced presence of events featuring two longitudinally polarized bosons are defined. A nonzero fraction of events with two longitudinally polarized bosons is measured with an observed significance of 5.3 standard deviations in the region with 100<𝑝𝑍𝑇≀200 GeV and 1.6 standard deviations in the region with 𝑝𝑍𝑇 >200 GeV, where 𝑝𝑍𝑇 is the transverse momentum of the 𝑍 boson. This Letter also reports the first study of the radiation-amplitude-zero effect. Events with two transversely polarized bosons are analyzed for the Ξ”β’π‘Œβ‘(β„“π‘Šβ’π‘) and Ξ”β’π‘Œβ‘(π‘Šβ’π‘) distributions defined respectively as the rapidity difference between the lepton from the π‘Š boson decay and the 𝑍 boson and the rapidity difference between the π‘Š boson and the 𝑍 boson. Significant suppression of events near zero is observed in both distributions. Unfolded Ξ”β’π‘Œβ‘(β„“π‘Šβ’π‘) and Ξ”β’π‘Œβ‘(π‘Šβ’π‘) distributions are also measured and compared to theoretical predictions.
Item Description:ATLAS Collaboration: G. Aad, A. Ackermann, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, L. Sanfilippo, A. Schoening, H-C. Schultz-Coulon, V. Sothilingam, R. Stamen, L. Vigani, M. Wessels, J. Zinsser [und zahlreiche weitere]
Gesehen am 14.01.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.133.101802

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