Jets in LHC searches

Jets with missing energy is a striking signature for new physics at the LHC. It confronts us with large Standard Model backgrounds like Z/W+jets and QCD jet. We can describe these backgrounds in terms of staircase scaling of the exclusive number of jets. The theoretical errors for this scaling are well under control. We can furthermore test staircase scaling and its relation to Poisson scaling in photon plus jets production. In inclusive new physics analyses the effective mass yields complementary information. We use a log-likelihood analysis for SUSY benchmark points to show the power of our approach.