Determination of the width of the top quark

Abazov, V. and Abbott, B. and Abolins, M. and Acharya, B. and Adams, M. and Adams, T. and Alexeev, G. and Alkhazov, G. and Altona, A. and Alverson, G. and Alves, G. and Ancu, L. and Aoki, M. and Arnoud, Y. and Arov, M. and Askew, A. and Åsman, B. and Atramentov, O. and Avila, C. and BackusMayes, J. and Badaud, F. and Bagby, L. and Baldin, B. and Bandurin, D. and Banerjee, S. and Barberis, E. and Baringer, P. and Barreto, J. and Bartlett, J. and Bassler, U. and Bazterra, V. and Beale, S. and Bean, A. and Begalli, M. and Begel, M. and Belanger-Champagne, C. and Bellantoni, L. and Beri, S. and Bernardi, G. and Bernhard, R. and Bertram, I. and Besançon, M. and Beuselinck, R. and Bezzubov, V. and Borissov, G. and Fox, H. and Love, P. and Price, D. and Ratoff, P. and Sopczak, A. (2011) Determination of the width of the top quark. Physical review letters, 106 (2). ISSN 1079-7114

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We extract the total width of the top quark, Gamma_t, from the partial decay width Gamma(t -> W b) measured using the t-channel cross section for single top quark production and from the branching fraction B(t -> 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'|

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Journal Article
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Physical review letters
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© 2011 The American Physical Society
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12 Jan 2012 01:54
Last Modified:
15 Aug 2020 02:13