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Measurement of the cross section for electroweak production of a Z boson, a photon and two jets in proton-proton collisions at s√ = 13 TeV and constraints on anomalous quartic couplings
CMS Collaboration
CMS Collaboration
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Abstract
A measurement is presented of the cross section for electroweak production of a Z boson and a photon in association with two jets (Zγjj) in proton-proton collisions. The Z boson candidates are selected through their decay into a pair of electrons or muons. The process of interest, electroweak Zγjj production, is isolated by selecting events with a large dijet mass and a large pseudorapidity gap between the two jets. The measurement is based on data collected at the CMS experiment at s√ = 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 in the standard model. These results are combined with published results by CMS at s√ = 8 TeV, which leads to observed and expected respective significances of 4.7 and 5.5 standard deviations. From the 13 TeV data, a value is obtained for the signal strength of electroweak Zγjj production and bounds are given on quartic vector boson interactions in the framework of dimension-eight effective field theory operators.
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2020-06-10
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Springer
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JHEP06(2020)076.pdf
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Electroweak interaction, Hadron-Hadron scattering (experiments)
Citation
The CMS collaboration., Sirunyan, A.M., Tumasyan, A. et al. Measurement of the cross section for electroweak production of a Z boson, a photon and two jets in proton-proton collisions at s√ = 13 TeV and constraints on anomalous quartic couplings. J. High Energ. Phys. 2020, 76 (2020). https://doi.org/10.1007/JHEP06(2020)076