Speaker
Hulin Wang
(Southern Methodist University (US))
Description
Vector-boson scattering processes provide a unique way to probe the mechanism
of electroweak symmetry breaking. Similar physics can be probed by studying
the production of three gauge bosons. The results can also be used for a
model-independent search for new physics at the TeV scale via anomalous
quartic gauge couplings.
The ATLAS collaboration has studied vector boson scattering in final states
with two gauge bosons and two forward jets in 20.3 /fb of 8TeV proton-proton
collision data, in particular two same-sign W bosons, a WZ boson pair, and a
W or Z boson in association with an isolated photon. The studies are
complemented by a search for anomalous vector boson production of WW+WZ pairs
in their semileptonic decays to lnujj in association with two forward jets.
The collaboration has used this data set as well to study the production of
three gauge bosons. A search was carried out for the production of three
W bosons. The cross sections for the production of a W or Z boson in
association with two isolated photons has been also measured. Z boson decays into
charged leptons as well as neutrinos were studied.
Finally, a measurement of exclusive production of W boson pairs produced
by the interaction of two photons will be presented. This topology is found
to provide strong constraints on anomalous quartic gauge couplings.
