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dc.date.accessioned |
2014-03-01T01:21:20Z |
|
dc.date.available |
2014-03-01T01:21:20Z |
|
dc.date.issued |
2004 |
en |
dc.identifier.issn |
1434-6044 |
en |
dc.identifier.uri |
https://dspace.lib.ntua.gr/xmlui/handle/123456789/16206 |
|
dc.subject.classification |
Physics, Particles & Fields |
en |
dc.subject.other |
LIQUID ARGON CALORIMETER |
en |
dc.subject.other |
MISSING TRANSVERSE-MOMENTUM |
en |
dc.subject.other |
DEEP-INELASTIC-SCATTERING |
en |
dc.subject.other |
HIGH-ENERGY-PHYSICS |
en |
dc.subject.other |
PARTON DISTRIBUTIONS |
en |
dc.subject.other |
E(+)E(-) COLLISIONS |
en |
dc.subject.other |
PERTURBATION-THEORY |
en |
dc.subject.other |
HADRON-COLLISIONS |
en |
dc.subject.other |
BOSON PRODUCTION |
en |
dc.subject.other |
LEADING ORDER |
en |
dc.title |
Search for single top quark production in ep collisions at HERA |
en |
heal.type |
journalArticle |
en |
heal.identifier.primary |
10.1140/epjc/s2003-01588-2 |
en |
heal.identifier.secondary |
http://dx.doi.org/10.1140/epjc/s2003-01588-2 |
en |
heal.language |
English |
en |
heal.publicationDate |
2004 |
en |
heal.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. |
en |
heal.publisher |
SPRINGER-VERLAG |
en |
heal.journalName |
European Physical Journal C |
en |
dc.identifier.doi |
10.1140/epjc/s2003-01588-2 |
en |
dc.identifier.isi |
ISI:000189173600002 |
en |
dc.identifier.volume |
33 |
en |
dc.identifier.issue |
1 |
en |
dc.identifier.spage |
9 |
en |
dc.identifier.epage |
22 |
en |