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Simultaneous measurement of the ratio R=B(t --> Wb)/B(t --> Wq) and the top-quark pair production cross section with the D0 detector at sqrt(s) = 1.96 TeV |
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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 Arthaud 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 S Banerjee P Barberis E Barfuss A-F Bargassa P Baringer P 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 Bertram I Besançon M |
| Affiliation: | Joint Institute for Nuclear Research, Dubna, Russia. |
| Abstract: | We present the first simultaneous measurement of the ratio of branching fractions, R=B(t --> Wb)/B(t --> Wq), with q being a d, s, or b quark, and the top-quark pair production cross section sigma(tt[over]) in the lepton plus jets channel using 0.9 fb(-1) of pp[over] collision data at sqrt(s)=1.96 TeV collected with the D0 detector. We extract R and sigma(tt[over]) by analyzing samples of events with 0, 1, and > or =2 identified b jets. We measure R=0.97(+0.09)/(-0.08)(stat+syst) and sigma(tt[over])=8.18(+0.09)(-0.84)(stat+syst) +/- 0.50(lumi) pb, in agreement with the standard model prediction. |
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