Search for single-top production in ep collisions at HERA

Article, Conference object, Preprint English OPEN
Chekanov, S ; Derrick, M ; Krakauer, D ; Loizides, J H ; Magill, S ; Musgrave, B ; Repond, J ; Yoshida, R ; Mattingly, M C K ; Antonioli, P ; Bari, G ; Basile, M ; Bellagamba, L ; Boscherini, D ; Bruni, A ; Bruni, G ; Romeo, G C ; Cifarelli, L ; Cindolo, R ; Contin, A ; Corradi, M ; De Pasquale, S ; Giusti, P ; Iacobucci, G ; Margotti, A ; Nania, R ; Palmonari, F ; Pesci, A ; Saitorelli, G ; Zichichi, A ... view all 335 authors (2003)
  • Publisher: Elsevier BV
  • Journal: volume 559, issue 3-4, pages 153-170 (issn: 1824-8039)
  • Related identifiers: doi: 10.1016/S0370-2693(03)00333-2
  • Subject: QUARK PRODUCTION | COLOR DIPOLE MODEL | Research Groups and Centres\Physics\Low Temperature Physics | DEEP-INELASTIC-SCATTERING | Faculty of Science\Physics | HIGH-ENERGY LEPTON | PARTON DISTRIBUTIONS | LUND MONTE-CARLO | QC | CENTRAL TRACKING DETECTOR | High Energy Physics - Experiment | ZEUS BARREL CALORIMETER | MISSING TRANSVERSE-MOMENTUM | CROSS-SECTIONS | Nuclear and High Energy Physics
    • ddc: ddc:530
    arxiv: High Energy Physics::Phenomenology | High Energy Physics::Experiment

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