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Evidence for Production of Single Top Quarks and First Direct Measurement of |Vtb|

V. M. Abazov et al. (DØ Collaboration)
Phys. Rev. Lett. 98, 181802 – Published 1 May 2007

Abstract

The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron pp¯ collider. Using a 0.9fb1 dataset, we apply a multivariate analysis to separate signal from background and measure σ(pp¯tb+X,tqb+X)=4.9±1.4pb. 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<|Vtb|1 at 95% C.L. within the standard model.

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  • Received 22 December 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.181802

©2007 American Physical Society

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Vol. 98, Iss. 18 — 4 May 2007

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