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Search for single top quark production in ep collisions at HERA.

H1 Collaboration, The and Henderson, Rob C. W. and Sloan, T. and Aktas, A. (2004) Search for single top quark production in ep collisions at HERA. European Physical Journal C: Particles and Fields, 33 (1). pp. 9-22. ISSN 1434-6044

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Abstract

A search for single top quark production is performed in collisions 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 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 at . 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 coupling are established at the 95% confidence level.

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23993
Deposited By: ep_ss_importer
Deposited On: 25 Feb 2009 13:40
Refereed?: Yes
Published?: Published
Last Modified: 10 Jun 2013 15:51
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23993

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