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The inclusive same-sign dilepton channel is already recognized as a promisingdiscovery signature for supersymmetry in the early days of the LHC. We pointout that it can also be used for precision measurements of sparticle massesafter the initial discovery. As an illustration, we consider the LM6 CMS studypoint in minimal supergravity, where the same-sign leptons most often resultfrom chargino decays to sneutrinos. We discuss three different techniques fordetermining the chargino and sneutrino masses in an inclusive manner, i.e.using only the two well measured lepton momenta, while treating all otherupstream objects in the event as a single entity of total transverse momentumPT. This approach takes full advantage of the large production rates of coloredsuperpartners, but does not rely on the poorly measured hadronic jets, andavoids any jet combinatorics problems. We discuss the anticipated precision ofour methods in the early LHC data.

Precision sparticle spectroscopy in the inclusive same-sign dilepton channel at LHC