  The process of vector boson scattering is of great interest because it is
completely prescribed in the Standard Model (SM) once the Higgs mass is known.
The LHC is a source of Z-Z pairs produced by means of the vector boson fusion
mechanism which is inferred by the presence of two additional forward (or tag)
jets. Because the reaction can be initiated by valence quarks and because the
W+W->Z+Z cross section approaches a constant in the SM, the scattering process
is accessible at the LHC.
