Color-octet mechanism and J/psi polarization at LEP

Details Color-octet mechanism and J/psi polarization at LEP Color-octet mechanism and J/psi polarization at LEP

1997-01-03

arxiv.org/abs/hep-ph/9701208v2

Phys.Rev. D55 (1997) 6839-6843

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, minor changes, version to be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.55.6839

Polarized heavy quarkonium productions in $Z^0$ decays are considered. We find that polarizations of the produced quarkonia are independent of that of the parent Z^0 provided that one considers the energy distribution or the total production rate. Produced J/psi's via the color-octet and the color- singlet mechanisms are expected to be 19% and 29% longitudinally polarized, respectively. The energy dependence of eta_{1,8}(x)=\frac{dGamma_{1,8}^L}{dx} /\frac{dGamma_{1,8}}{d x} is very sensitive to the production mechanism, and therefore the measurement of \eta(x)_exp will be an independent probe of the color-octet mechanism.

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