Abstract
Experiments at the LHC are sensitive to the presence or absence of matter quanta at mass scales far beyond the scales they can probe directly. The production of Z boson pairs by gluon-gluon fusion is gratly enhanced if there are ultraheavy quanta that carry SU(3) Color and get their mass from electroweak symmetry breaking. For example, a fourth generation quark doublet with an arbitrarily heavy mass would induce a large excess in the ZZ yield that could be detected at the LHC with only ∼- 10% of the design luminosity.
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