Measurement of |Vcb| and |Vub| at LEP

被引：0
|
作者：
Österberg, K [1 ]
机构：
[1] Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland
来源：
HIGH ENERGY PHYSICS 99, PROCEEDINGS | 2000年
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中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
Delphi has measured \V-ub\/\|V-cb\ using semileptonic decays with secondary hadronic systems having masses below the D mass, enriched in b --> ul (v) over bar transitions, and found the ratio to be 0.100 +/- 0.011 (stat.) +/- 0.018 (syst.) +/- 0.009 (model). Combined with other LEP measurements, a \V-ub\ of (41.2 +/- 3.9) x 10(-3) from a (B) over bar (0) --> D*(+)l (v) over bar decay rate study close to D*(+) zero recoil. The corresponding LEP averaged \V-ub\ is (38.4 +/- 3.3) x 10(-3). From the LEP semileptonic B branching fraction, a \V-ub\ of (40.75 +/- 2.08) x 10(-3) is obtained, giving a new LEP overall \V-ub\ of (40.2 +/- 1.9) x 10(-3).
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页码：631 / 633
页数：3
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