Evidence for Production of Single Top Quarks and First Direct Measurement of vertical bar V{sub tb} vertical bar

Journal Article · Fri May 04 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.181802· OSTI ID:20951329

Abazov, V M; Alexeev, G D; Kalinin, A M; Kharzheev, Y M; Malyshev, V L; Tokmenin, V V; Eijk, B van; Vertogradov, L S; Yatsunenko, Y A ^[1]; Abbott, B; Gutierrez, P; Hall, I; Jain, S; Kopal, M; Pompos, A; Severini, H; Skubic, P; Strauss, M ^[2]; Abolins, M; Benitez, J A ^[3]

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1. Joint Institute for Nuclear Research, Dubna (Russian Federation)
2. University of Oklahoma, Norman, Oklahoma 73019 (United States)
3. Michigan State University, East Lansing, Michigan 48824 (United States)

The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron pp collider. Using a 0.9 fb{sup -1} dataset, we apply a multivariate analysis to separate signal from background and measure {sigma}(pp{yields}tb+X,tqb+X)=4.9{+-}1.4 pb. The probability to measure a cross section at this value or higher in the absence of a signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa matrix element that describes the Wtb coupling and find 0.68< vertical bar V{sub tb} vertical bar {<=}1 at 95% C.L. within the standard model.

• OSTI ID: 20951329
• Journal Information: Physical Review Letters, Vol. 98, Issue 18; Other Information: DOI: 10.1103/PhysRevLett.98.181802; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
FERMILAB TEVATRON
KOBAYASHI-MASKAWA MATRIX
MULTIVARIATE ANALYSIS
PROBABILITY
SIGNALS
STANDARD MODEL
T QUARKS