Search for single top quark production in ep collisions at HERA

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Aktas, A (author)

Search for single top quark production in ep collisions at HERA

Article/chapterEnglish2004

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Springer Science and Business Media LLC,2004

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LIBRIS-ID:oai:lup.lub.lu.se:18678fae-6853-48f9-bd85-2f1367988fbb
https://lup.lub.lu.se/record/286460URI
https://doi.org/10.1140/epjc/s2003-01588-2DOI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype

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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.

Subject headings and genre

NATURVETENSKAP Fysik Subatomär fysik hsv//swe
NATURAL SCIENCES Physical Sciences Subatomic Physics hsv//eng

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Jönsson, LeifLund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)quar-ljo (author)
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Search for single top quark production in ep collisions at HERA

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