Search for long-lived parents of Z0 bosons in pp̄ collisions at √s = 1.8 TeV
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We search for new long-lived particles which decay to Z0 bosons by looking tor Z0→e+e- decays with displaced vertices. We find no evidence for parent particles of the Z0 with long lifetimes in 90 pb-1 of data from the CDF experiment at Fermilab. We set a cross section limit as a function of the lifetime of the parent particle for both a generic Z0 parent and a fourth-generation, charge -1/3 quark that decays into Z0b.
author list (cited authors)
Abe, F., Akimoto, H., Akopian, A., Albrow, M. G., Amadon, A., Amendolia, S. R., ... Demortier, L.