Early SUSY discovery at LHC via sparticle cascade decays to same-sign and multimuon states

In the very early stages of LHC running, uncertainties in detector performance will lead to large ambiguities in jet, electron and photon energy measurements, along with inferred missing transverse energy. However, muon detection should be quite straightforward, with the added benefit that muons can be reliably detected down to transverse energies of order 5 GeV. Supersymmetry discovery through multimuon channels has been extensively explored in the literature, but always relying on hard ET^miss cuts. Here, we quantify signal and background rates for same-sign (SS) dimuon and multimuon production at the LHC without any ET^miss cuts. The LHC, operating at \sqrt{s}=10 TeV, should be able to discover a signal over expected background consistent with gluino pair production for m_{\tg}\alt 450 (550) GeV in the SS dimuon plus \ge 4 jets state with just 0.1 (0.2) fb^{-1} of integrated luminosity.