Searches at HERA

Abstract

Searches for physics beyond the Standard Model have been performed in high-energy $e^{\pm }p$ collisions at HERA. No significant deviation from the Standard Model has been observed while searching for contact interactions, extra dimensions, leptoquarks, R-parity violating squarks and excited fermions. Exclusion limits have been inferred which extend or complement bounds from other colliders. The H1 collaboration has observed a puzzling excess of events with an high $P_t$ isolated lepton and missing transverse momentum, and interpretation as flavour changing neutral currents has been explored.

7 pages, 6 figures, contribution to the Lake Louise Winter Institute