Events with isolated leptons and missing transverse momentum and anomalous top production at HERA

摘要

Events with high energy isolated leptons and missing energy have been observed with H1 detector in ep collisions at HERA. In a data sample corresponding to an integrated luminosity of 115.2 pb~(-1), 18 events have been selected for an expectation of 10.5+-2.5 from Standard Model processes, dominated by real W production. The interpretation of the observed events in terms of anomalous single top production is explored and a limit on anomalous effective coupling k_(γu t) is calculated.