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1.	Aktas, A, et al. (author) Search for single top quark production in ep collisions at HERA 2004 In: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 33:1, s. 9-22 Journal article (peer-reviewed)abstract A search for single top quark production is performed in e(+/-) pcollisions at HERA. The search exploits data corresponding to an integrated luminosity of 118.3 pb(-1). A model for the anomalous production of top quarks in a flavour changing neutral current process involving a tugamma coupling is investigated. Decays of top quarks into a b quark and a W boson are considered in the leptonic and the hadronic decay channels of the W. Both a cut-based analysis and a multivariate likelihood analysis are performed to discriminate anomalous top quark production from Standard Model background processes. In the leptonic channel, 5 events are found while 1.31 +/- 0.22 events are expected from the Standard Model background. In the hadronic channel, no excess above the expectation for Standard Model processes is found. These observations lead to a cross section (ep --> e t X) = 0.29(-0.14)(+0.15) pb at roots = 319 GeV. Alternatively, assuming that the observed events are due to a statistical fluctuation, upper limits of 0.55 pb on the anomalous top production cross section and of 0.27 on the tugamma coupling k(tugamma) are established at the 95% confidence level.

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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Beckingham, M. (1); Bracinik, J. (1); Bruncko, D. (1); Caron, S. (1); Dingfelder, J. (1); Fleischmann, P. (1); show more...; Hoffmann, D. (1); Katzy, J. (1); Klein, M. (1); Kroseberg, J. (1); Laycock, P. (1); Lobodzinska, E. (1); Mehta, A. (1); Meier, K. (1); Meyer, J. (1); Naumann, T. (1); Rizvi, E. (1); Sauvan, E. (1); Schmitt, S. (1); Schoeffel, L. (1); Schwanenberger, C. (1); South, D. (1); Stamen, R. (1); Tsipolitis, G. (1); Valkar, S. (1); Vest, A. (1); Wessels, M. (1); Zhang, Z. (1); Diaconu, C. (1); zur Nedden, M. (1); Ferencei, J. (1); Greenshaw, T. (1); Ibbotson, M. (1); Kluge, T. (1); Lendermann, V. (1); Garvey, J. (1); Haller, J. (1); Zhokin, A. (1); Aktas, A. (1); Collard, C. (1); Koblitz, B. (1); Kostka, P. (1); Lebedev, A. (1); Nozicka, M. (1); Kennedy, J. (1); Levonian, S. (1); Marshall, R. (1); Tomasz, F. (1); Kuhr, T. (1); Johnson, C. (1); show less...

University: Lund University (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2004 (1)

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