The Search for New Physics at HERA

Abstract

The latest results on a variety of searches for new physics at HERA by the ZEUS and H1 Collaborations are presented. HERA, the world’s only ep Collider at DESY, Hamburg, running 1991−2007 at centre-of-mass energies up to 320 GeV, was ideally suited for searches for physics beyond the Standard Model due to its unique initial state. The H1 and ZEUS experiments with their asymmetric design provided 4π Coverage, excellent lepton ID and HFS reconstruction to detect any exotic signatures. The searches use the complete HERA data sample corresponding to a total integrated luminosity of about 1 fb−1 (0.5 fb−1 per experiment) and including combined H1+ZEUS results. Topics covered include a search for eqeq contact interactions, a general search for new phenomena at HERA, a search for lepton flavour violation, a search for isolated leptons in events with missing transverse momentum, a search for single top production, a search for excited fermions and a search for squark production in MSSM and mSUGRA models. The results are competitive and complementary to results from other colliders.