1999/06/19 by Andreas Warburton
Physics and Astronomy · #hep-ex
published as '99 Electroweak Interactions and Unified Theories (Series: Moriond Particle Physics Meetings), ed. J. Tran Thanh Van, pp. 275-280 (The Gioi Publishers, Vietnam: 2001) · 7 pages, LaTeX, 3 eps figures; Invited talk presented at the 1999 Electroweak Interactions and Unified Theories session of the XXXIVth Rencontres de Moriond, Arc 1800, Savoie, France, 13 - 20 March 1999; also available through http://w4.lns.cornell.edu/public/CLNS
We report on studies of three types of B-meson decay that can contribute to an understanding of fundamental intergenerational quark mixing, charge-conjugation--parity violation, and long-distance quantum chromodynamics. Specifically, we discuss a selection of analyses related to the Cabibbo-Kobayashi-Maskawa (CKM) parameters Vcb, Vub, alpha, and gamma, and the nonperturbative heavy quark effective theory quantities lambda1 and lambdabar. We first describe an examination of the first and second moments of the hadronic-recoil mass and charged-lepton energy spectra in inclusive b -> c l nu decays. We also report on the reconstruction, using similar experimental techniques, of the CKM-suppressed decay B -> rho l nu and the extraction of its branching fraction, Br(B0 -> rho- l+ nu) = (2.57 +- 0.29 +0.33/-0.46 +- 0.41) x 10E-4, as well as the value |Vub| = (3.25 +- 0.14 +0.21/-0.29 +- 0.55) x 10E-3, where the uncertainties are statistical, systematic, and due to model dependence, respectively. Finally, we present results on rare two-body charmless hadronic B -> K pi, pi pi, and K K decays and comment briefly on their implications to the geometry of the CKM unitarity triangle, including a bound on gamma.