B decay shape variables and the precision determination of |Vcb| and mb -: art. no. 054012

被引：78

作者：

Bauer, CW ^{[1
]}

Ligeti, Z

Luke, M

Manohar, AV

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[3] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

来源：

PHYSICAL REVIEW D | 2003年 / 67卷 / 05期

关键词：

D O I：

10.1103/PhysRevD.67.054012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present expressions for shape variables of B decay distributions in several different mass schemes, to order alpha(s)(2)beta(0) and Lambda(QCD)(3)/m(b)(3). Such observables are sensitive to the b quark mass and matrix elements in the heavy quark effective theory, and recent measurements allow precision determinations of some of these parameters. We perform a combined fit to recent experimental results from CLEO, BABAR, and DELPHI, and discuss the theoretical uncertainties due to nonperturbative and perturbative effects. We discuss the possible discrepancy between the OPE prediction, recent BABAR results and the measured branching fraction to D and D* states. We find \V-cb\ = (40.8+/-0.9)x10(-3) and m(b)(1S) = 4.74+/-0.10 GeV, where the errors are dominated by experimental uncertainties.

引用

页数：16

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