Search for single-top production in ep collisions at HERA

Details Search for single-top production in ep collisions at HERA Search for single-top production in ep collisions at HERA

2003-02-09

arxiv.org/abs/hep-ex/0302010v3

Phys.Lett.B559:153-170,2003

Physics

High Energy Physics

High Energy Physics - Experiment

28 pages, 4 figures, 2 tables, final version (minor changes in text) Addendum with new limits included

Scientific paper

10.1016/S0370-2693(03)00333-2

A search for single-top production, ep --> etX, has been made with the ZEUS detector at HERA using an integrated luminosity of 130.1 pb-1. Events from both the leptonic and hadronic decay channels of the W boson resulting from the decay of the top quark were sought. For the leptonic mode, the search was made for events with isolated high-energy leptons and significant missing transverse momentum. For the hadronic decay mode, three-jet events in which two of the jets had an invariant mass consistent with that of the W were selected. No evidence for top production was found. The results are used to constrain single-top production via flavour-changing neutral current (FCNC) transitions. The ZEUS limit excludes a substantial region in the FCNC t-u-gamma coupling not ruled out by other experiments.

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