Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-03-31
Phys.Rev.D55:6924-6932,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, revtex, 2 postscript figures. Section on the nonrelativistic quark model estimates is removed; some points of the
Scientific paper
10.1103/PhysRevD.55.6924
We compute the order 1/m_b^3 nonperturbative contributions to the inclusive differential B\to X_c\ell\bar\nu decay rate. They are parametrized by the expectation values of two local and four nonlocal dimension-six operators. We use our results to estimate part of the theoretical uncertainties in the extraction of matrix elements \bar\Lambda and \lambda_1 from the lepton spectrum in the inclusive semileptonic B decay and find them to be very large. We also compute the 1/m_b^3 corrections to the moments of the hadronic invariant mass spectrum in this decay, and combine them with the extracted values of \bar\Lambda and \lambda_1 to put an upper bound on the branching fraction Br(B\to D^{**}\ell\bar\nu).
Gremm Martin
Kapustin A. A.
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