Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-10-01
Phys.Rev.D67:054012,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 3 figures, Version to appear in PRD
Scientific paper
10.1103/PhysRevD.67.054012
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}/mb)^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 |Vcb| = (40.8 +- 0.9) x 10^{-3} and mb^{1S} = 4.74 +- 0.10 GeV, where the errors are dominated by experimental uncertainties.
Bauer Christian W.
Ligeti Zoltan
Luke Michael
~Manohar Aneesh V.
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