Determination of the width of the top quark
Creators: name: Abazov, V. M.
name: Abbott, B.
name: Abolins, M.
name: Acharya, B. S.
name: Adams, M.
name: Adams, T.
name: Alexeev, G. D.
name: Alkhazov, G.
name: Altona, A.
name: Alverson, G.
name: Alves, G. A.
name: Ancu, L. S.
name: Aoki, M.
name: Arnoud, Y.
name: Arov, M.
name: Askew, A.
name: Åsman, B.
name: Atramentov, O.
name: Avila, C.
name: BackusMayes, J.
name: Badaud, F.
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name: Banerjee, S.
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name: Bartlett, J. F.
name: Bassler, U.
name: Bazterra, V.
name: Beale, S.
name: Bean, A.
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name: Begel, M.
name: Belanger-Champagne, C.
name: Bellantoni, L.
name: Beri, S. B.
name: Bernardi, G.
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name: Besançon, M.
name: Beuselinck, R.
name: Bezzubov, V. A.
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name: Borissov, G.
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name: Yin, H.
name: Yip, K.
name: Yoo, H. D.
name: Youn, S. W.
name: Yu, J.
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Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We extract the total width of the top quark, Gamma_t, from the partial decay width Gamma(t -&gt; W b) measured using the t-channel cross section for single top quark production and from the branching fraction B(t -&gt; W b) measured in ttbar events using up to 2.3 fb^-1 of integrated luminosity collected by the D0 Collaboration at the Tevatron ppbar Collider. The result is Gamma_t = 1.99 +0.69 -0.55 GeV, which translates to a top-quark lifetime of tau_t = (3.3 +1.3 -0.9) x 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 |Vtb'| &lt; 0.63 at 95% C.L.
description: submitted to Phys. Rev. Letters