Events with isolated leptons and missing transverse momentum at HERA

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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 $2.6σ$ level. A search for events with tau leptons and missing transverse momentum is also presented.
4 pages, to appear in the proceedings of the XXXIII ICHEP, Moskow, July 2006

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High Energy Physics - Experiment

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http://salesiana.dossiersoluciones.com/handle/123456789/117611

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/hep-ex/0610041
 http://arxiv.org/abs/hep-ex/0610041

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arXiv