Improved variables for measuring the $Lambda_b$ polarization

Details Improved variables for measuring the $Lambda_b$ polarization Improved variables for measuring the $Lambda_b$ polarization

1995-12-17

arxiv.org/abs/hep-ph/9512330v1

Phys.Rev. D53 (1996) 6186-6194

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 4 uuencoded figures, REVTeX

Scientific paper

10.1103/PhysRevD.53.6186

We discuss a few possible strategies for measuring the polarization of the $\Lambda_{\mathrm{b}}$ baryons produced in $e^+e^-$-annihilation at the $\mathrm{Z}$ resonance through their inclusive semileptonic decays. After reviewing the existing methods, a new method is proposed, based on the ratio of the averages of the squared electron and neutrino energy, including both perturbative and nonperturbative corrections. This variable minimizes the statistical error on the $\Lambda_{\mathrm{b}}$ polarization, while keeping the systematic theoretical errors at the level of 1-2%. A number of other polarization-sensitive variables are also discussed, such as averages of ratios of the electron and neutrino energy and the distribution in the difference of the electron and neutrino rapidities.

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