A Crucial Test for Color-Octet Production Mechanism in Z^0 Decays

Abstract

The direct production rates of $D$-wave charmonia in the decays of $Z^0$ is evaluated. The color-octet production processes $Z^0{\to }^3{D}_J(c\bar{c})q\bar{q}$ are shown to have distinctively large branching ratios, the same order of magnitude as that of $J/\psi$ prodution, as compared with other $D$-wave charmonium production mechanisms. This may suggest a crucial channel to test the color-octet mechanism as well as to observe the $D$-wave charmonium states in $Z^0$ decays. In addition, a signal for the ${}^3{D}_J$ charmonium as strong as $J/\psi$ or ${\psi }^{\prime }$ with large transverse momentum at the Tevatron should also be observed.

14 pages in LaTex (3 figures in PS-file)

References in corpus (12)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Color-octet quarkonia production
• Color-Octet Fragmentation and the psi' Surplus at the Tevatron
• Quarkonium Wave Functions at the Origin
• Perturbative QCD Fragmentation Functions for $B_c$ and $B_c^{\ast }$ Production
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• Gluon Fragmentation into P-wave Heavy Quarkonium
• Fragmentation contribution to quarkonium production in hadron collision
• Color-Octet Quarkonium Production at the $Z$ Pole
• Quarkonium production and decays
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