Search for single top quarks in the tau + jets channel using 4.8 fb-1 of p over(p, ̄) collision data

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Zverev

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16 Scopus citations

Abstract

We present the first direct search for single top quark production using reconstructed tau leptons in the final state. The search is based on 4.8 fb-1 of integrated luminosity collected in p over(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 being identified as b quark jet. 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 7.3 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. We measure a combined cross section of 3.84+0.89 -0.83 pb, which is the most precise measurement to date.

Original languageEnglish
Pages (from-to)5-14
Number of pages10
JournalPhysics Letters B
Volume690
Issue number1
DOIs
StatePublished - Jun 7 2010
Externally publishedYes

Funding

We thank the staffs at Fermilab and collaborating institutions, and acknowledge support from the DOE and NSF (USA) ; CEA and CNRS/IN2P3 (France) ; FASI, Rosatom and RFBR (Russia) ; CNPq, FAPERJ, FAPESP and FUNDUNESP (Brazil) ; DAE and DST (India) ; Colciencias (Colombia) ; CONACyT (Mexico) ; KRF and KOSEF (Korea) ; CONICET and UBACyT (Argentina) ; FOM (The Netherlands) ; STFC and the Royal Society (United Kingdom) ; MSMT and GACR (Czech Republic) ; CRC Program, CFI, NSERC and WestGrid Project (Canada) ; BMBF and DFG (Germany) ; SFI (Ireland) ; The Swedish Research Council (Sweden) ; and CAS and CNSF (China) .

FundersFunder number
MSMT
National Science Foundation
U.S. Department of Energy
CRC Health Group
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
California Earthquake Authority
Kortney Rose Foundation
Natural Sciences and Engineering Research Council of Canada
Canada Foundation for Innovation
Science and Technology Facilities CouncilPP/F000863/1, ST/H001166/1, ST/H00095X/2
Royal Society
Department of Science and Technology, Ministry of Science and Technology, India
Department of Atomic Energy, Government of India
Science Foundation Ireland
Deutsche Forschungsgemeinschaft
Stichting voor Fundamenteel Onderzoek der Materie
Fundação de Amparo à Pesquisa do Estado de São Paulo
National Natural Science Foundation of China
Grantová Agentura České Republiky
Russian Foundation for Basic Research
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Consejo Nacional de Investigaciones Científicas y Técnicas
Consejo Nacional de Ciencia y Tecnología
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Korea Science and Engineering Foundation
Vetenskapsrådet
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Centre National de la Recherche Scientifique
Federal Agency for Science and Innovation
State Atomic Energy Corporation ROSATOM
Fundação para o Desenvolvimento da UNESP
Secretaría de Ciencia y Técnica, Universidad de Buenos Aires
Institut National de Physique Nucléaire et de Physique des Particules

    Keywords

    • Single top
    • Tau leptons
    • Top quarks

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