Abstract
A measurement of the electroweak (EW) production of two jets in association with a mathrm {Z} boson in proton-proton collisions at sqrt{s}=13,text {TeV} is presented, based on data recorded in 2016 by the CMS experiment at the LHC corresponding to an integrated luminosity of 35.9,text {fb}^{text {--}1}. The measurement is performed in the ell ell mathrm {jj} final state with ell including electrons and muons, and the jets j corresponding to the quarks produced in the hard interaction. The measured cross section in a kinematic region defined by invariant masses m_{ell ell } >50,text {GeV} , m_{mathrm {jj}} >120,text {GeV} , and transverse momenta p_{mathrm {T j}} > 25,text {GeV} is sigma _mathrm {EW}(ell ell mathrm {jj})= 534 pm 20,text {(stat)} pm 57,text {(syst) fb} , in agreement with leading-order standard model predictions. The final state is also used to perform a search for anomalous trilinear gauge couplings. No evidence is found and 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 -2.6< c_{WWW}/varLambda ^2 < 2.6,text {TeV}^{-2} and -8.4< c_{W}/varLambda ^2 < 10.1,text {TeV}^{-2}. The additional jet activity of events in a signal-enriched region is also studied, and the measurements are in agreement with predictions.
Highlights
In proton-proton collisions at the CERN LHC, the production of dileptons ( ) consistent with the Z boson invariant mass in association with two jets is dominated by events where the dilepton pair is produced by a Drell–Yan (DY) process, in association with jets from strong interactions
The diboson production processes WW, WZ, and ZZ are generated with pythia and normalized to next-to-next-toleading order (NNLO) cross section computations obtained with mcfm (v8.0) [46]
Limits on anomalous trilinear gauge couplings (ATGCs) parameters were previously set by LEP [65], ATLAS [66,67], and CMS [68,69]
Summary
In proton-proton (pp) collisions at the CERN LHC, the production of dileptons ( ) consistent with the Z boson invariant mass in association with two jets (jj) is dominated by events where the dilepton pair is produced by a Drell–Yan (DY) process, in association with jets from strong interactions. This production is governed by a mixture of electroweak (EW) and strong processes of order αE2WαS2, where αS is the strong coupling and αEW is the EW coupling strength.
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