An observation of the electroweak production of a W-boson with two associated jets in a vector-boson fusion topology.

An observation of Electroweak production of a $W$-boson in association with two jets at high dijet mass is performed, using $\sqrt{s} = 8$ TeV $pp$ collision data from the ATLAS detector, corresponding to 20.2 fb$^{-1}$ of data. The process is observed to greater than the 5$\sigma$ level and a fiducial cross section of $\sigma_{\textrm{Fid}} = \textrm{387.9 } \pm \textrm{20.4 } (\textrm{stat.}) \pm \textrm{5.4 } \textrm{(lumi.) } ^{+34.8}_{-27.3} \textrm{ (syst.) } ^{+34.9}_{-34.6} \textrm{ (theo.) } \textrm{ fb}$ is extracted.