Details

Autor(en) / Beteiligte

• Abazov, V. M.
• Åsman, Barbro
• Bélanger-Champagne, Camille
• Clément, Christophe
• Gollub, Nils
• Hansson, Per
• Strandberg, Jonas
• Strandberg, Sara
• Zverev, E. G.
• et al

Titel

Evidence for production of single top quarks and first direct measurement of vertical bar V-tb vertical bar

Ist Teil von

• Physical review letters, 2007, Vol.98 (18), p.181802

Erscheinungsjahr

2007

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron < p(p)over bar > collider. Using a 0.9 fb(-1) dataset, we apply a multivariate analysis to separate signal from background and measure sigma(< p(p)over bar >-> tb+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 <vertical bar V-tb vertical bar <= 1 at 95% C.L. within the standard model.