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 $B\to K(K^*)X$. The decay distributions are calculated. Their branching ratios are found to be appreciable. The CP asymmetries in the neutral B modes $\bar{B^0}\to K^-(K^{*-})X$ are sizable. An observation of direct CP violation and a measurement of $\gamma$ 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 $B$ 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 $B$ 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 $|V_{ts}|$ are described.Comment: 18 pages, Late