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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 𝑊⁢𝑍→ℓ⁡𝜈⁢ℓ′⁡ℓ′⁡(ℓ,ℓ′=𝑒,𝜇) production. The dataset used corresponds to an integrated luminosity of 140 fb−1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector...

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Hauptverfasser: Aad, Georges (VerfasserIn) , Ackermann, Anke (VerfasserIn) , Baltes, Lisa Marie (VerfasserIn) , Bartels, Falk (VerfasserIn) , Dittmeier, Sebastian (VerfasserIn) , Dunford, Monica (VerfasserIn) , Franchino, Silvia (VerfasserIn) , Junkermann, Thomas (VerfasserIn) , Mkrtchyan, Tigran (VerfasserIn) , Sanfilippo, Lorenzo (VerfasserIn) , Schöning, André (VerfasserIn) , Schultz-Coulon, Hans-Christian (VerfasserIn) , Sothilingam, Varsiha (VerfasserIn) , Stamen, Rainer (VerfasserIn) , Vigani, Luigi (VerfasserIn) , Wessels, Martin (VerfasserIn) , Zinßer, Joachim (VerfasserIn)
Körperschaft: ATLAS Collaboration (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 5 September 2024
In: Physical review letters
Year: 2024, Jahrgang: 133, Heft: 10, Pages: 1-24
ISSN:1079-7114
DOI:10.1103/PhysRevLett.133.101802
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.133.101802
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.133.101802
Volltext
Verfasserangaben:G. Aad et al. (ATLAS Collaboration)
Beschreibung
Zusammenfassung:This Letter presents the first study of the energy dependence of diboson polarization fractions in 𝑊⁢𝑍→ℓ⁡𝜈⁢ℓ′⁡ℓ′⁡(ℓ,ℓ′=𝑒,𝜇) production. The dataset used corresponds to an integrated luminosity of 140 fb−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 Δ⁢𝑌⁡(ℓ𝑊⁢𝑍) and Δ⁢𝑌⁡(𝑊⁢𝑍) distributions defined respectively as the rapidity difference between the lepton from the 𝑊 boson decay and the 𝑍 boson and the rapidity difference between the 𝑊 boson and the 𝑍 boson. Significant suppression of events near zero is observed in both distributions. Unfolded Δ⁢𝑌⁡(ℓ𝑊⁢𝑍) and Δ⁢𝑌⁡(𝑊⁢𝑍) distributions are also measured and compared to theoretical predictions.
Beschreibung: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
Beschreibung:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.133.101802

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