We discuss the Λ b-polarization of the bottom baryon Λ b in its production and in its decay. Standard Model predictions for b-quark polarization on the Z-peak are reviewed, including beam-quark orientation effects and O( α s) radiative corrections to the polarization. The b-quark polarization is expected to be handed over to the Λ b into which it fragments with a high degree of efficiency. We present several spin-momentum correlation measures of the spin of the Λ b with the momenta of its decay products in its inclusive semileptonic decay. We estimate the strengths of the spin-momentum correlations in the Free Quark Decay (FQD) model and find that some of the measures provide good or very good analyzing power for measuring the polarization of the Λ b.
Nuclear Physics B Proceedings Supplements
- Pub Date:
- June 1996
- High Energy Physics - Phenomenology
- Lecture given at the conference "Production and Decay of Hyperons, Charm and Beauty Hadrons", Strassbourg, France, September 5-8, 1995