Multijet Discriminators for New Physics in Leptonic Signals at the LHC

Understand

Some of the cleanest signals for new physics in the early runs of the LHC will involve strongly-produced particles which give rise to multiple leptons by undergoing cascade decays through weakly-interacting states to stable particles.

• Some of the most spectacular final states will involve three or more leptons, multiple jets and generally missing energy-momentum as well.
• A triad of the most interesting models of new physics which induce such signals is known to consist of (i) supersymmetry with R-parity conservation, (ii) a universal extra dimension with conservation of KK-parity and (iii) little Higgs models with conserved T-parity.
• Similar signals could also arise if the Standard Model is augmented with a fourth sequential generation of heavy fermions.