Open AccessObservation of ZZ production via Vector Boson Scattering in ATLAS
Author(s) -
I. Maznas
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2105/1/012013
Subject(s) - electroweak interaction , physics , vector boson , large hadron collider , atlas (anatomy) , scattering , particle physics , optics , medicine , anatomy
This document presents measurement results of the ZZ production via Vector Boson Scattering interactions in 139 fb −1 of data recorded by the ATLAS detector from pp collisions at s = 13 TeV during LHC Run-II (2015-2018). In this study, 127 candidate events with a fully leptonic final state ( ℓℓℓℓjj ) have been observed and another 82 events for ℓℓvvjj final state, with a contribution of the purely electroweak ZZjj process estimated to be 20.6 ± 2.5 and 12.3 ± 0.7 events respectively. The measured cross sections were found to be 1.27 ± 0.14 fb (1.22 ± 0.35 fb ) for ℓℓℓℓjj ( ℓℓvvjj ) in their respective fiducial regions. Using multivariant methods, the EW production of ZZjj events (combining the ℓℓℓℓjj and ℓℓvvjj channels) was measured to have a signal strength of 1.35± 0.34, which leads to a rejection of the no-electroweak hypothesis with a statistical significance of 5.5 σ .