SUPERSYMMETRY AT A PROPOSED ROOT-S=4-TEV UPGRADE OF THE FERMILAB-TEVATRON

We study the signals for supersymmetry at the Fermilab Tevatron and it s proposed energy upgrade (called the DiTevatron here) (root s = 4 TeV ) in various well-motivated supersymmetric models. We consider the tri lepton signature in the decay of pair-produced charginos and neutralin os, the missing energy signature in gluino and squark production, and the b ($) over bar b signal in the decay of the lightest supersymmetri c Higgs boson produced in association with a W or Z boson. In each cas e we perform signal and background studies, using Monte Carlo and/or r eal data to estimate the sensitivity to these signals at the Tevatron and DiTevatron with the main Injector, for short- and long-term integr ated luminosities of L = 10 and 25 fb(-1), and 5 sigma statistical sig nificance. We conclude that one could probe chargino masses as high as m(chi 1)+/- similar to 180 (200) GeV, gluino masses as high as m(g)(- ) similar to 450 (750) GeV, and lightest Higgs boson masses as high as m(h) similar to 110 (120) GeV at the Tevatron (DiTevatron). A high-lu minosity option at the Tevatron (10(33) cm(-2)s(-1)) may compensate so mewhat for the higher reach of the DiTevatron, but only in the trilept on and Higgs signals. However, these gains may be severely compromised once the multiple-interaction environment of the high-luminosity Teva tron is accounted for.