A search is presented for anomalous quartic gauge boson couplings in vector-boson scattering. The data for the analysis correspond to $20.2{\mathrm{fb}}^{-1}$ of $\sqrt{s}=8\mathrm{TeV}$ $pp$ collisions and were collected in 2012 by the ATLAS experiment at the Large Hadron Collider. The search looks for the production of $WW$ or $WZ$ boson pairs accompanied by a high-mass dijet system, with one $W$ decaying leptonically and a $W$ or $Z$ decaying hadronically. The hadronically decaying $W/Z$ is reconstructed as either two small-radius jets or one large-radius jet using jet substructure techniques. Constraints on the anomalous quartic gauge boson coupling parameters ${\alpha }_4$ and ${\alpha }_5$ are set by fitting the transverse mass of the diboson system, and the resulting 95% confidence intervals are $-0.024<{\alpha }_4<0.030$ and $-0.028<{\alpha }_5<0.033$.

• Received 19 September 2016

DOI:https://doi.org/10.1103/PhysRevD.95.032001

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2017 CERN, for the ATLAS Collaboration