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

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

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    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.

    Item Type: Article
    Journal or Publication Title: Physical Review Letters
    Additional Information: © 2007 The American Physical Society
    Uncontrolled Keywords: electroweak theories ; proton-proton inclusive interactions ; quark production ; standard model
    Subjects: Q Science > QC Physics
    Departments: Faculty of Science and Technology > Physics
    ID Code: 11235
    Deposited By: Dr Iain Bertram
    Deposited On: 12 Aug 2008 09:43
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 14:58
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/11235

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