Events with isolated leptons and missing transverse momentum at HERA

Abstract : 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.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00144254
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Submitted on : Thursday, May 3, 2007 - 4:22:25 PM
Last modification on : Tuesday, March 30, 2021 - 3:18:17 AM

Citation

C. Diaconu. Events with isolated leptons and missing transverse momentum at HERA. 33rd International Conference on High-Energy Physics, ICHEP 06, Jul 2006, Moscou, Russia. ⟨in2p3-00144254⟩

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