CMS-PAS-SMP-18-007

CMS-PAS-SMP-18-007
Measurement of electroweak production of Z$\gamma$ in association with two jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
July 2019

Abstract: A measurement of electroweak production of a Z boson and a photon in association with two jets in proton-proton collisions is presented. The Z boson candidates are selected through their decay into a pair of electrons or muons. The electroweak production of the Z$\gamma$jj final state is isolated by selecting events with a large dijet mass and a large rapidity gap between the two jets. The measurement is based on data collected with the CMS detector in 2016 at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The observed significance of the signal is 3.9 standard deviations, where a significance of 5.2 standard deviations is expected based on the standard model. The results are combined with previously published CMS results based on $\sqrt{s}=$ 8 TeV data, which leads to an observed (expected) significance of 4.7 (5.5) standard deviations. A cross section measurement in a fiducial region is reported. Bounds are given on quartic vector boson interactions in the framework of dimension-8 effective field theory operators.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, JHEP 06 (2020) 076. The superseded preliminary plots can be found here.

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