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Measurement of vector boson scattering and constraints on anomalous quartic couplings from events with four leptons and two jets in proton–proton collisions at √s = 13 TeV
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Measurement of vector boson scattering and constraints on anomalous quartic couplings from events with four leptons and two jets in proton–proton collisions at √s = 13 TeV

A. M Sirunyan, Hugues Brun, Cécile Caillol, Barbara Clerbaux, Gilles Lentdecker, Giuseppe Fasanella, Laurent Favart, Anastasia Grebenyuk, Georgia Karapostoli, Thomas Lenzi, …
Physics letters. B, Vol.774, pp.682-705
11/10/2017
DOI: 10.1016/j.physletb.2017.10.020
url
https://doi.org/10.1016/j.physletb.2017.10.020View
Published (Version of record) Open Access

Abstract

A measurement of vector boson scattering and constraints on anomalous quartic gauge couplings from events with two Z bosons and two jets are presented. The analysis is based on a data sample of proton–proton collisions at s=13 TeV collected with the CMS detector and corresponding to an integrated luminosity of 35.9 fb−1. The search is performed in the fully leptonic final state ZZ→ℓℓℓ′ℓ′, where ℓ,ℓ′=e or μ. The electroweak production of two Z bosons in association with two jets is measured with an observed (expected) significance of 2.7 (1.6) standard deviations. A fiducial cross section for the electroweak production is measured to be σEW(pp→ZZjj→ℓℓℓ′ℓ′jj)=0.40−0.16 +0.21(stat)−0.09 +0.13(syst) fb, which is consistent with the standard model prediction. Limits on anomalous quartic gauge couplings are determined in terms of the effective field theory operators T0, T1, T2, T8, and T9. This is the first measurement of vector boson scattering in the ZZ channel at the LHC.
High Energy Physics Experiment Phenomenology Physique des particules élémentaires

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