Lifetimes of Xi_{bc}^{+} and Xi_{bc}^{0} baryons

Estimates of lifetimes and partial branching ratios for the baryons $\Xi_{bc}^{+}$ and $\Xi_{bc}^{0}$ are presented using the inverse heavy quark mass expansion technique carried out in the Operator Product Expansion approach. We take into account both the perturbative QCD corrections to the spectator contributions and, depending on the quark contents of hadrons, the Pauli interference and weak scattering effects between the constituents, using a potential model for the evaluation of the non-perturbative parameters.Comment: 15 pages, LATEX file, 2 eps-figure

QCD one-loop correction to Higgs boson decay into quarkonium-pair

Rare decays of the Higgs boson into quarkonia-pairs are studied within the framework of NRQCD approach. The main decay mechanisms and their interference are studied in detail. One-loop corrections to the widths of these decays are taken into account for the first time.Comment: Minor changes for the text. Has been accepted by Phys. Rev.