Search for new physics in multi-body final states at high invariant masses with ATLAS

Preliminary results of a search for new physics in multi-body final states in proton-proton collisions at a centre-of-mass energy of ps = 7 TeV are presented. The data were collected in 2010 with the ATLAS detector at the LHC and correspond to an integrated luminosity of (295±32) nb−1. An upper limit of 0.38 nb, at the 95% confidence level, is determined for the production cross section times acceptance of new physics models that result in final states with at least three particles and an invariant mass above 800 GeV and with å pT > 700 GeV. The result is of interest for models of low-scale gravity and weakly-coupled string theory.