Measurement of electroweak production of two jets in association with a Z boson in proton–proton collisions at √s = 8 TeV
Author(s)Apyan, Aram; Barbieri, Richard Alexander; Bauer, Gerry P.; Busza, Wit; Cali, Ivan Amos; Chan, Matthew Hans; Di Matteo, Leonardo; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Klute, Markus; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Luckey, P. David, Jr.; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E.; Roland, Gunther M.; Stephans, George S. F.; Stockli, Fabian; Sumorok, Konstanty C.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yang, Mingming; Zanetti, Marco; Zhukova, Victoria; Gulhan, Doga Can; ... Show more Show less
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The purely electroweak (EW) cross section for the production of two jets in association with a Z boson, in proton–proton collisions at √s = 8 TeV, is measured using data recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 19.7 fb[superscript -1]. The electroweak cross section for the ℓℓ[subscript jj] final state (with ℓ = e or μ and j representing the quarks produced in the hard interaction) in the kinematic region defined by M[subscript ℓℓ] > 50 GeV, M[subscript jj] > 120 GeV, transverse momentum p[subscript Tj] > 25 GeV, and pseudorapidity |η[subscript j]|<5, is found to be σ[subscript EW](ℓℓ[subscript jj]) = 174 ± 15 (stat) ± 40(syst) \,fb, in agreement with the standard model prediction. The associated jet activity of the selected events is studied, in particular in a signal-enriched region of phase space, and the measurements are found to be in agreement with QCD predictions.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
The European Physical Journal C
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Ero, et al. “Measurement of Electroweak Production of Two Jets in Association with a Z Boson in Proton–proton Collisions at √s = 8 TeV.” Eur. Phys. J. C 75, no. 2 (February 2015). © 2015 CERN for the benefit of the CMS collaboration
Final published version