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Search for Single Top Quark Production in ep Collisions at HERA
- Source :
- European Physical Journal C: Particles and Fields, European Physical Journal C: Particles and Fields, 2004, 33, pp.9-22, European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2004, 33, pp.9-22, The European Physical Journal C, 33 (1), European physical journal : C : particles and fields
- Publication Year :
- 2004
- Publisher :
- HAL CCSD, 2004.
-
Abstract
- A search for single top quark production is performed in e±p 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 tuγ 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 σ(ep→etX)=0.29+0.15−0.14 pb at s√=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 tuγ coupling κtuγ are established at the 95% confidence level.<br />The European Physical Journal C, 33 (1)<br />ISSN:1434-6044<br />ISSN:1434-6052
- Subjects :
- Quark
Physics
Particle physics
Top quark
Physics and Astronomy (miscellaneous)
High Energy Physics::Phenomenology
FOS: Physical sciences
Top quark condensate
HERA
Omega baryon
Bottom quark
Standard Model
Sigma baryon
High Energy Physics - Experiment
Nuclear physics
High Energy Physics - Experiment (hep-ex)
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
High Energy Physics::Experiment
Engineering (miscellaneous)
Subjects
Details
- Language :
- English
- ISSN :
- 14346044 and 14346052
- Database :
- OpenAIRE
- Journal :
- European Physical Journal C: Particles and Fields, European Physical Journal C: Particles and Fields, 2004, 33, pp.9-22, European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2004, 33, pp.9-22, The European Physical Journal C, 33 (1), European physical journal : C : particles and fields
- Accession number :
- edsair.doi.dedup.....c5df4951415d427203a4b56f4076c3d8