Abazov, V. M. and Bertram, Iain and Borissov, Guennadi and Fox, Harald and Ratoff, Peter and Sopczak, Andre (2007) Evidence for production of single top quarks and first direct measurement of |V(tb)|. Physical Review Letters, 98 (18). p. 181802. ISSN 1079-7114
The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron p collider. Using a 0.9 fb-1 dataset, we apply a multivariate analysis to separate signal from background and measure (ptb+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<|Vtb|1 at 95% C.L. within the standard model.
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