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Evidence for production of single top quarks and first direct measurement of |V(tb)|.

Research output: Contribution to journalJournal article

Published

<mark>Journal publication date</mark>2007
<mark>Journal</mark>Physical Review Letters
Issue18
Volume98
Number of pages8
Pages181802
<mark>Original language</mark>English

Abstract

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.

Bibliographic note

© 2007 The American Physical Society