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Search for single top quarks in the tau+jets channel using 4.8 fb.sup.-1./sup. of p p-bar collision data

SYSNO ASEP	0352066
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Search for single top quarks in the tau+jets channel using 4.8 fb^-1 of p p-bar collision data
Author(s)	Abazov, V. M. (RU) Abbott, B. (US) Abolins, M. (US) Kupčo, Alexander (FZU-D)_{RID, ORCID} Lokajíček, Miloš (FZU-D)_{RID, ORCID}
Source Title	Physics Letters. B. - : Elsevier - ISSN 0370-2693 Roč. 690, č. 1 (2010), s. 5-14
Number of pages	10 s.
Language	eng - English
Country	NL - Netherlands
Keywords	D0 ; quark ; collisions ; lepton
Subject RIV	BF - Elementary Particles and High Energy Physics
R&D Projects	LC527 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	LA08047 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z10100502 - FZU-D (2005-2011)
UT WOS	000278933900002
DOI	10.1016/j.physletb.2010.05.003
Annotation	We present the first direct search for single top quark production using tau leptons. The search is based on 4.8 fb^-1$ of integrated luminosity collected in $p/bar{p}$ collisions at $/sqrt{s}$=1.96 TeV with the D0 detector at the Fermilab Tevatron Collider. We select events with a final state including an isolated tau lepton, missing transverse energy, two or three jets, one or two of them $b$ tagged. We use a multivariate technique to discriminate signal from background. The number of events observed in data in this final state is consistent with the signal plus background expectation. We set in the tau+jets channel an upper limit on the single top quark cross section of /TauLimObs pb at the 95% C.L. This measurement allows a gain of 4% in expected sensitivity for the observation of single top production when combining it with electron+jets and muon+jets channels already published by the D0 collaboration with 2.3 fb^-1$ of data.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2011

Number of the records: 1