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

Details Evidence for Single Top Quark Production and a First Direct Measurement of |Vtb| Evidence for Single Top Quark Production and a First Direct Measurement of |Vtb|

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008fuin.conf..257g&link_type=abstract

FUNDAMENTAL INTERACTIONS. Proceedings of the 22nd Lake Louise Winter Institute. Held 19-24 February 2007 in Lake Louise, Alberta

Mathematics

Probability

Scientific paper

The first evidence for single top quark production was recently reported by the D0 Collaboration.1 In 0.9 fb-1 data collected at the Fermilab Tevatron pbar {p} collider, we use Boosted Decision Trees to separate signal from background and measure σ (pbar {p} -> tb + X, tqb + X) = 4.9 ±1.4 pb. The probability to measure this cross section or higher in the absence of signal corresponds to a 3.4 standard deviation significance. From this cross section measurement we directly determine the CKM matrix element that describes the Wtb coupling and find 0.68 < |Vtb| ≤ 1 at 95% C.L. within the Standard Model.
This analysis was recently published in Phys. Rev. Lett.1

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