Supersymmetry reach of an upgraded Fermilab Tevatron collider

We examine the capability of a √s =2 TeV Fermilab Tevatron pp¯ collider to discover supersymmetry, given a luminosity upgrade to amass 25 fb^-1 of data. We compare with the corresponding reach of the Tevatron main injector (1 fb^-1 of data). Working within the framework of minimal supergravity with gauge coupling unification and radiative electroweak symmetry breaking, we first calculate the regions of parameter space accessible via the clean trilepton signal from W̃₁Z̃₂→3l+E/_T production, with detailed event generation of both signal and major physics backgrounds. The trilepton signal can allow equivalent gluino masses of up to m_g̃∼600–700 GeV to be probed if m₀ is small. If m₀ is large, then m_g̃∼500 GeV can be probed for μ<0; however, for μ>0 and large values of m₀, the rate for Z̃₂→Z̃₁ll¯ is suppressed by interference effects, and there is no reach in this channel. We also examine regions where the signal from W̃₁W̃¯₁→ll¯+E/_T is detectable. Although this signal is background limited, it is observable in some regions where the clean trilepton signal is too small. Finally, the signal W̃₁Z̃₂→jets+ll¯+E/_T can confirm the clean trilepton signal in a substantial subset of the parameter space where the trilepton signal can be seen.