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Determination of the width of the top quark |
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| Authors: | Abazov V M Abbott B Abolins M Acharya B S Adams M Adams T Alexeev G D Alkhazov G Alton A Alverson G Alves G A Ancu L S Aoki M Arnoud Y Arov M Askew A Åsman B Atramentov O Avila C BackusMayes J Badaud F Bagby L Baldin B Bandurin D V Banerjee S Barberis E Baringer P Barreto J Bartlett J F Bassler U Bazterra V Beale S Bean A Begalli M Begel M Belanger-Champagne C Bellantoni L Beri S B Bernardi G Bernhard R Bertram I Besançon M Beuselinck R Bezzubov V A Bhat P C Bhatnagar V Blazey G Blessing S Bloom K Boehnlein A Boline D Bolton T A Boos E E Borissov G Bose T Brandt A Brandt O Brock R |
| Institution: | Joint Institute for Nuclear Research, Dubna, Russia. |
| Abstract: | We extract the total width of the top quark, Γ(t), from the partial decay width Γ(t → Wb) measured using the t-channel cross section for single top-quark production and from the branching fraction B(t → Wb) measured in tt events using up to 2.3 fb(-1) of integrated luminosity collected by the D0 Collaboration at the Tevatron pp Collider. The result is Γ(t) = 1.99(-0.55)(+0.69) GeV, which translates to a top-quark lifetime of τ(t) = (3.3(-0.9)(+1.3)) × 10(-25) s. Assuming a high mass fourth generation b' quark and unitarity of the four-generation quark-mixing matrix, we set the first upper limit on |V(tb')| < 0.63 at 95% C.L. |
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