Search for Same-Sign Dilepton SUSY Signatures Using Top-Like Events with CMS at the LHC

A search for new physics is performed in conjunction with a measurement of the $t\bar{t}$ production cross section in $pp$ collisions at a center-of-mass energy of $7\tev$. The analysis uses a data sample corresponding to an integrated luminosity of $36 \pm 1\pbinv$ collected at the LHC with the CMS detector. The $t\bar{t}$ cross section measurement uses events with one isolated muon and multiple hadronic jets. The measured cross section is found to be $\sigma(t\bar{t}) = 159.1 \pm 12.1(\textrm{stat})^{+33.8}_{-28.2}(\textrm{syst}) \pm 6.4(\textrm{lumi})\textrm{pb}$, consistent with the expectations of the Standard Model. This measurement is used in the new physics search, which requires two same-sign isolated leptons, multiple hadronic jets and missing transverse energy in the final state. The observed event yields agree with Standard Model predictions, and no evidence of new physics is found.