Experiments at the LHC are sensitive to the presence or absence of mat
ter quanta at mass scales far beyond the scales they can probe directl
y. The production of Z boson pairs by gluon-gluon fusion is greatly en
hanced if there are ultraheavy quanta that carry SU(3)(Color) and get
their mass from electroweak symmetry breaking. For example, a fourth g
eneration quark doublet with an arbitrarily heavy mass would induce a
large excess in the ZZ yield that could be detected at the LHC with on
ly similar or equal to 10% of the design luminosity.