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If produced at the LHC, long-lived charged particles (LLCPs) would leavetracks in the muon detector. Time-of-Flight based methods for detecting theseparticles become less efficient if the LLCPs are fast, which would typically bethe case if they are produced in the decays of some mother particle which iseither heavy or very boosted. Thus for example, in supersymmetric models withlong-lived sleptons, the long-lived sleptons produced in neutralino decays areoften fast, with beta above 0.95 even at a 7 TeV LHC. We propose to use the(mis-measured) invariant mass distribution of "muon"-lepton pairs, where the"muon" could be a slepton LLCP, to detect it. This distribution peaks somewhatbelow the neutralino mass. The peak can be further enhanced by evaluating thedistribution for different values of candidate "muon" masses. We simulate twoGMSB-like models to show that this procedure can be used to detect thelong-lived sleptons and measure both their mass and the neutralino mass.

When a Muon Is Not a Muon--- Detecting Fast Long-Lived Charged Particles from Cascade Decays Using a Mass Scan