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First measurement of the ratio B(t --> Wb)/B(t --> Wq) and associated limit on the Cabibbo-Kobayashi-Maskawa element /V(tb)/ |
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| Authors: | Affolder T Akimoto H Akopian A Albrow M G Amaral P Amendolia S R Amidei D Anikeev K Antos J Apollinari G Arisawa T Asakawa T Ashmanskas W Azfar F Azzi-Bacchetta P Bacchetta N Bailey M W Bailey S de Barbaro P Barbaro-Galtieri A Barnes V E Barnett B A Baroiant S Barone M Bauer G Bedeschi F Belforte S Bell W H Bellettini G Bellinger J Benjamin D Bensinger J Beretvas A Berge J P Berryhill J Bevensee B Bhatti A Binkley M Bisello D Bishai M Blair R E Blocker C Bloom K Blumenfeld B Blusk S R Bocci A Bodek A Bokhari W Bolla G Bonushkin Y Bortoletto D Boudreau J Brandl A van den Brink S Bromberg C |
| Affiliation: | Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. |
| Abstract: | We present the first measurement of the ratio of branching fractions R identical withB(t-->Wb)/B(t-->Wq) from p_p collisions at sqrt[s] = 1.8 TeV. The data set corresponds to 109 pb(-1) of data recorded by the Collider Detector at Fermilab during the 1992-95 Tevatron run. We measure R = 0.94(+0.31)(-0.24)(stat+syst) or R>0.61 (0.56) at 90% (95)% C.L., in agreement with the standard model predictions. This measurement yields a limit on the Cabibbo-Kobayashi-Maskawa quark mixing matrix element /V(tb)/ under the assumption of three generations and unitarity. |
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