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Search for Single Top Production in e^+- p collisions at HERA |
| Reference |
C.Vallee, presented at EPS 2001, July 2001 |
| Document |
Conference paper
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| Contact |
Christinel Diaconu |
| Abstract |
A search for anomalous top quark production mediated by a flavour changing neutral current via a gamma-u-t coupling is performed in e^+- p collisions at HERA. The search exploits data collected from 1994 to 2000 and is motivated by the previous observation of out standing events with isolated leptons, missing transverse momentum and a jet with large transverse momentum. The top decay into a b-jet and a W-boson is considered in both the leptonic and hadronic decay modes of the W. In leptonic decay modes, five events are found to be compatible with the hypothesis of anomalous top quark production while 1.8 events are expected from Standard Model. No excess above the Standard Model expectation is found in the analysis of the hadronic decay channel. An upper limit on the anomalous gamma-u-t coupling is established in the framework of recent NLO calculations. The sensitivity of HERA to flavour changing neutral currents is found to be competitive with that at other existing high energy colliders. |
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