  The interaction among vector bosons is crucial to understanding electroweak
symmetry breaking. At the LHC one technique is to use "tag" jets to identify
vector boson fusion processes leading to two vector bosons and two "tag" jets
in the final state. Another approach is to study the production of three vector
bosons in the final state. There is a clear tradeoff since in the latter case
clear "tags" are not available, although the cross sections are substantially
larger than those for vector boson fusion.
