Resumen
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. 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 ΔY(ℓWZ) and ΔYℓWZ) 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 ΔY(ℓWZ) and ΔY(WZ) distributions are also measured and compared to theoretical predictions.
Idioma original | Inglés |
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Número de artículo | 101802 |
Publicación | Physical Review Letters |
Volumen | 133 |
N.º | 10 |
DOI | |
Estado | Publicada - 6 sep. 2024 |
Áreas temáticas de ASJC Scopus
- Física y Astronomía General