Search for a missing energy signature from New Physics in di-jet and multi-jet events

A first search for supersymmetry in events with jets and missing energy was carried out in Phys. Lett. B 698 (2011) 196, using 35 pb$^{-1}$ of integrated luminosity at $\sqrt{s}$ = 7 TeV. In this search, the variable $\alpha_{\rm T}$ was used as the main discriminator between events with real and fake missing transverse energy and no excess of events over the Standard Model expectation was found. In this note an extended interpretation of the above result is presented. The dependence of the exclusion limit on the $\tan\beta$ parameter of the Constrained Minimal Supersymmetric extension of the Standard Model is studied. Furthermore, upper limits on the cross section for different Simplified Model Spectra are presented.