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Evidence for production of single top quarks and first direct measurement of |Vtb| |
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| Authors: | Abazov V M Abbott B Abolins M Acharya B S Adams M Adams T Aguilo E Ahn S H Ahsan M Alexeev G D Alkhazov G Alton A Alverson G Alves G A Anastasoaie M Ancu L S Andeen T Anderson S Andrieu B Anzelc M S Arnoud Y Arov M Askew A Asman B Assis Jesus A C S Atramentov O Autermann C Avila C Ay C Badaud F Baden A Bagby L Baldin B Bandurin D V Banerjee P Banerjee S Barberis E Bargassa P Baringer P Barnes C Barreto J Bartlett J F Bassler U Bauer D Beale S Bean A Begalli M Begel M Belanger-Champagne C Bellantoni L Bellavance A Benitez J A Beri S B Bernardi G Bernhard R Berntzon L Bertram I Besançon M |
| Institution: | Joint Institute for Nuclear Research, Dubna, Russia. |
| Abstract: | The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron ppover ] collider. Using a 0.9 fb(-1) dataset, we apply a multivariate analysis to separate signal from background and measure sigma(ppover ]-->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<|V(tb)| |
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