Probing minimal supergravity at the CERN LHC for large tan beta

For large values of the minimal supergravity model parameter tan ,t he tau lepton and the bottom quark Yukawa couplings become large, leading to reduced masses of -sleptons and b-squarks relative to their rst and second generation counterparts, and to enhanced decays of charginos and neutralinos to -leptons and b-quarks. We evaluate the reach of the CERN LHC pp collider for supersymmetry in the mSUGRA model parameter space. We nd that values of m~ g 1500 2000 GeV can be probed with just 10 fb 1 of integrated luminosity for tan values as high as 45, so that mSUGRA cannot escape the scrutiny of LHC experiments by virtue of having a large value of tan. We also perform a case study of an mSUGRA model at tan =4 5 where e Z2 ! ~1 and f W1 ! ~1 with 100% branching fraction. In this case, at least within our simplistic study, we show that a di-tau mass edge, which determines the value of m e Z2 m e Z1 , can still be reconstructed. This information can be used as a starting point for reconstructing SUSY cascade decays on an event-by-event basis, and can provide a strong constraint in determining the underlying model parameters. Finally, we show that for large tan there can be an observable excess of leptons, and argue that signals might serve to provide new information about the underlying model framework.