Measurement of electroweak production of a W boson in association with two jets in proton-proton collisions at [Formula: see text]

在质子-质子碰撞中测量与两个喷注相关的 W 玻色子的电弱产生 [公式:见正文]

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Abstract

A measurement is presented of electroweak (EW) production of a W boson in association with two jets in proton-proton collisions at [Formula: see text] . The data sample was recorded by the CMS Collaboration at the LHC and corresponds to an integrated luminosity of 35.9 fb-1 . The measurement is performed for the ℓν jj final state (with ℓν indicating a lepton-neutrino pair, and j representing the quarks produced in the hard interaction) in a kinematic region defined by invariant mass mjj > 120 Ge and transverse momenta pTj > 25 Ge . The cross section of the process is measured in the electron and muon channels yielding σEW(Wjj) = 6.23 ± 0.12 (stat) ± 0.61 (syst) pb per channel, in agreement with leading-order standard model predictions. The additional hadronic activity of events in a signal-enriched region is studied, and the measurements are compared with predictions. The final state is also used to perform a search for anomalous trilinear gauge couplings. Limits on anomalous trilinear gauge couplings associated with dimension-six operators are given in the framework of an effective field theory. The corresponding 95% confidence level intervals are - 2.3 < cWWW/Λ2 < 2.5 Te -2 , - 8.8 < cW/Λ2 < 16 Te -2 , and - 45 < cB/Λ2 < 46 Te -2 . These results are combined with the CMS EW Zjj analysis, yielding the constraint on the cWWW coupling: - 1.8 < cWWW/Λ2 < 2.0 Te -2 .

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