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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

Journal publication date2007
JournalPhysical Review Letters
Journal number18
Volume98
Number of pages8
Pages181802
Original languageEnglish

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