Events with isolated leptons and missing transverse momentum at HERA
  Events with isolated leptons and missing transverse momentum are searched for in electron- or positron-proton collisions at HERA by the H1 and ZEUS experiments. Such events may be explained within the Standard Model by W boson production, followed by leptonic decay. The analysis performed including HERA I and the recently collected data at HERA II results in clear evidence of W production. However, H1 collaboration observes an excess of events in e^+p collisions, not supported so far by ZEUS. If the difference between the H1 and ZEUS observations is attributed to a statistical fluctuation, the combined result exceeds the Standard Model prediction at $2.6\sigma$ level. A search for events with tau leptons and missing transverse momentum is also presented. 
Cristinel Diaconu, CPP Marseille and DESY (on behalf of the H1 and   ZEUS Collaborations)