文摘
A search for single-top production, , has been performed with the ZEUS detector at HERA using data corresponding to an integrated luminosity of . No evidence for top production was found, consistent with the expectation from the Standard Model. Limits were computed for single-top production via flavour changing neutral current transitions involving a neutral electroweak vector boson, ¦Ã or Z. The result was combined with a previous ZEUS result yielding a total luminosity of . A 95 % credibility level upper limit of was obtained for the cross section at the centre-of-mass energy of .