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 𝑊𝑍→ℓ𝜈ℓ′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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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
5 September 2024
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| 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) |
MARC
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| 520 | |a This Letter presents the first study of the energy dependence of diboson polarization fractions in →ℓℓ′ℓ′(ℓ,ℓ′=,) 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<≤200 GeV and 1.6 standard deviations in the region with >200 GeV, where is the transverse momentum of the 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(ℓ) and Δ() distributions defined respectively as the rapidity difference between the lepton from the boson decay and the boson and the rapidity difference between the boson and the boson. Significant suppression of events near zero is observed in both distributions. Unfolded Δ(ℓ) and Δ() distributions are also measured and compared to theoretical predictions. | ||
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