  A measurement of electroweak-induced production of W gamma and two jets is
performed, where the W boson decays leptonically. The data used in the analysis
correspond to an integrated luminosity of 19.7 inverse femtobarns collected by
the CMS experiment in sqrt(s) = 8 TeV proton-proton collisions produced at the
LHC. Candidate events are selected with exactly one muon or electron, missing
transverse momentum, one photon, and two jets with large rapidity separation.
An excess over the hypothesis of the standard model without electroweak
production of W gamma with two jets is observed with a significance of 2.7
standard deviations. The cross section measured in the fiducial region is 10.8
+/- 4.1 (stat) +/- 3.4 (syst) +/- 0.3 (lumi) fb, which is consistent with the
standard model electroweak predictions. The total cross section for W gamma
production in association with 2 jets in the same fiducial region is measured
to be 23.2 +/- 4.3 (stat) +/- 1.7 (syst) +/- 0.6 (lumi) fb, which is consistent
with the standard model prediction from the combination of electroweak- and
quantum chromodynamics-induced processes. No deviations are observed from the
standard model predictions and experimental limits on anomalous quartic gauge
couplings f[M, 0-7] / Lambda^4, f[T, 0-2] / Lambda^4, and f[T, 5-7] / Lambda^4
are set at 95% confidence level.
