60 research outputs found
Higher twist corrections to the sum rule for semileptonic B decay
The sum rule for charmless inclusive semileptonic B-meson decays allows a
theoretically clean and experimentally efficient determination of |V_{ub}|. The
leading twist contribution to the sum rule is known in QCD. We compute higher
twist corrections to the sum rule using the heavy quark effective theory.Comment: 9 pages, no figure
Model-independent determination of |V_{ub}|
The decay distribution of the kinematic variable \xi_u in inclusive charmless
semileptonic decays of B mesons is unique. The novel method for a
model-independent determination of |V_{ub}| is described.Comment: 5 pages, presented at the 3rd International Conference on B Physics
and CP Violation, Taipei, Taiwan, 3-7 Dec 199
B -> K(K^*)X: Decay Distributions, Branching Ratios and CP Asymmetries
We discuss an improved theoretical description of the semi-inclusive B meson
decays . The decay distributions are calculated. Their branching
ratios are found to be appreciable. The CP asymmetries in the neutral B modes
are sizable. An observation of direct CP violation
and a measurement of may come from these neutral B modes.Comment: 4 pages, 9 ps figures, Proceedings of the 4th International Workshop
on B Physics & CP Violation (BCP4), Ise-Shima, Japan, February 19-23, 200
Long distance effects on the B\to X_s\gamma photon energy spectrum
We compute long distance effects on the photon energy spectrum in inclusive
radiative decays of mesons using light-cone expansion and heavy quark
effective theory. We show that for sufficiently high photon energy the leading
nonperturbative QCD contribution is attributed to the distribution function.
The distribution function is found to be universal in the sense that the same
distribution function also encodes the leading nonperturbative contribution to
inclusive semileptonic decays of mesons at large momentum transfer. Some
basic properties of the distribution function are deduced in QCD. Ways of
extracting the distribution function directly from experiment and their
implications are discussed. The theoretically clean methods for the
determination of are described.Comment: 18 pages, Late
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