Search for new physics with same-sign di-leptons, jets, and missing transverse energy in pp-collisions at 7 TeV

\def\etmiss{\not\!\!{E_{T}}} We present the results of a search for new physics involving events with 2 same-sign leptons, jets, and missing transverse energy. The search is performed using data collected in the 2010 LHC run at $\sqrt{s} = $7 TeV, corresponding to a total integrated luminosity 34.7~pb$^{-1}$. The leptons used in the analysis are muons ($p_T>5$~GeV, $|\eta|<2.4$) and electrons ($p_T>10$~GeV, $|\eta|<2.4$). The hadronic activity is characterized by the total transverse energy, $H_T$, of all jets with $E_T>30$~GeV and $|\eta|<2.5$. The $H_T$ is required to be greater than 300~GeV and must be built from a minimum of two jets in an event. The missing transverse energy, $\etmiss$, is built by using the energy flow objects and is required to be greater than 30~GeV. We observe 1 event, which is statistically consistent with the total expected Standard Model background rate of $0.8 \pm 0.31$ events. Given this lack of an excess, we set limits on the parameter space of SUSY models with universal and non-universal gaugino masses scales. The general limit on cross section $\sigma$ times the event acceptance, $A$, described above is $\sigma \times A^{\rm{theory}} \times A^{\rm{exp}} < 0.13$~pb at 95\% C.L.. A parameterization of the experimental acceptance, $A^{\rm{exp}}$, is also presented, which can be applied to any given model.