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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 $\sqrt{s}$ = 13 TeV


CMS Collaboration; Canelli, Florencia; Kilminster, Benjamin; Aarestad, Thea; Caminada, Lea; de Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hinzmann, Andreas; Hreus, Tomas; Ngadiuba, Jennifer; Pinna, Deborah; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Zucchetta, Alberto; et al (2017). Measurement of vector boson scattering and constraints on anomalous quartic couplings from events with four leptons and two jets in proton–proton collisions at $\sqrt{s}$ = 13 TeV. Physics Letters B, B774:682-705.

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 $\sqrt{s}$ = 13TeV collected with the CMS detector and corresponding to an integrated luminosity of 35.9fb$^{−1}$. The search is performed in the fully leptonic final state $ZZ \to \ell\ell\ell^{\prime}\ell^{\prime}$, where $\ell, \ell^{\prime}$ = e or $\mu$. 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 $\sigma_{EW}(pp \to ZZjj \to \ell\ell\ell^{\prime}\ell^{\prime} jj) = 0.40^{+0.21}_{-0.16}(stat)^{+0.13}_{-0.09}(syst)fb$, 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.

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 $\sqrt{s}$ = 13TeV collected with the CMS detector and corresponding to an integrated luminosity of 35.9fb$^{−1}$. The search is performed in the fully leptonic final state $ZZ \to \ell\ell\ell^{\prime}\ell^{\prime}$, where $\ell, \ell^{\prime}$ = e or $\mu$. 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 $\sigma_{EW}(pp \to ZZjj \to \ell\ell\ell^{\prime}\ell^{\prime} jj) = 0.40^{+0.21}_{-0.16}(stat)^{+0.13}_{-0.09}(syst)fb$, 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.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:08 Feb 2018 16:28
Last Modified:19 Feb 2018 10:46
Publisher:Elsevier
ISSN:0370-2693
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.physletb.2017.10.020

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