Abstract
A first observation is presented for the electroweak production of a W boson, a photon, and two jets in proton-proton collisions. The W boson decays are selected by requiring one identified electron or muon and an imbalance in transverse momentum. The two jets are required to have a high dijet mass and a large separation in pseudorapidity. The measurement is based on data collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. The observed (expected) significance for this process is 4.9 (4.6) standard deviations. After combining with previously reported CMS results at 8 TeV, the observed (expected) significance is 5.3 (4.8) standard deviations. The cross section for the electroweak Wγjj production in a restricted fiducial region is measured as 20.4±4.5fb and the total cross section for Wγ production in association with 2 jets in the same fiducial region is 108±16fb. All results are in good agreement with recent theoretical predictions. Constraints are placed on anomalous quartic gauge couplings in terms of dimension-8 effective field theory operators.
Highlights
After the discovery of the Higgs boson at the CERN LHC [1,2,3], one of the primary goals of high-energy physics is to examine the details of the mechanism of electroweak (EW) symmetry breaking, e.g., through measurements of the properties of the Higgs boson
The cross section for the electroweak Wγjj production in a restricted fiducial region is measured as 20.4 ± 4.5 fb and the total cross section for Wγ production in association with 2 jets in the same fiducial region is 108 ± 16 fb
The cross section for the electroweak production of a W boson, a photon, and two jets is measured in proton-proton collisions at a center-of-mass energy of 13 TeV
Summary
After the discovery of the Higgs boson at the CERN LHC [1,2,3], one of the primary goals of high-energy physics is to examine the details of the mechanism of electroweak (EW) symmetry breaking, e.g., through measurements of the properties of the Higgs boson. CMS recently reported an observation of WZ VBS events at a significance of 6.8 SD [6], along with further studies in the W±W±jj channel, based on data collected at 13 TeV. For measuring the EW Wγjj production, candidate events are selected by requiring one identified lepton (either an electron or muon), one identified photon, two jets with a large rapidity separation and a large dijet invariant mass (mjj), and a moderate imbalance in transverse momentum, pmT iss This selection reduces the contribution from the strong (QCD) production of jets produced together with the W boson and the photon, making the experimental signature an ideal topology for VBS Wγ studies. The interference among the VBS diagrams ensures the unitarity of the VBS cross section in the SM at high energy, and an interference is expected between QCD and EW processes [13, 14]
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