The differential decay spectrum dΓ/dEedq 2 for the semileptonic decay of an unpolarized hadron containing a b-quark, and the decay spectrum dΓ/dEedq dcos θ for polarized Λb decay are computed to second order in the 1/mb expansion. Most of the 1/m 2 b corrections have a simple physical interpretation, which is discussed in detail. The implications of the results for the determination of Vub are ...

It is shown that the existing data on two-body B decays, some of them only upper limits, are precise enough to perform an isospin analysis to extract the phase shifts due to final state interaction. Unlike charm decays, no significant final state interaction is observed in decays B → Dπ,Dρ, and Dπ supporting the factorization hypothesis in these decays. From the isospin amplitudes obtained, we ...

The influence of nonvanishing quark masses on the total cross section in electron positron collisions and on the Z decay rate is calculated. The corrections are expanded in m 2 /s and α s. Methods similar to those applied for the quadratic mass terms allow to derive the corrections of order α s m 4 /s 2 and α 2 s m 4 /s 2. Coefficients which depend logarithmically on m 2 /s and which cannot be ...

The τ lepton arising from the scalar tau (τ̃ ) decay is naturally polarized. Pτ depends on the left–right mixing of the τ̃ and the gaugino–higgsino mixing of the neutralino. The polarization Pτ could be measured from the energy distribution of the decay products of τ at future e+e− colliders. A measurement of Pτ and of the τ̃ production cross section allows to determine both these mixing angles. E...

mental process by which virtually all organisms obtain energy. For this reason, biochemists are interested in electrochemically characterizing proteins that make up electron transport pathways. They are also interested in understanding at a molecular level how a protein’s structure influences its electron transfer function. In this study, the electron transfer protein rubredoxin (F1) from the d...