Signature for Color-Octet Production of $J/ψ$ in $e^+ e^-$ Annihilation

Details Signature for Color-Octet Production of $J/ψ$ in $e^+ e^-$ Annihilation Signature for Color-Octet Production of $J/ψ$ in $e^+ e^-$ Annihilation

1995-08-25

arxiv.org/abs/hep-ph/9508373v2

Phys.Rev.Lett.76:730-733,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

Some discussions, axis of the figure, address of one of the Authors (E. Braaten) changed; to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.76.730

The inclusive cross section for the production of $J/\psi$ in $e^+ e^-$ annihilation is studied using a recently developed factorization formalism. In addition to the conventional color-singlet contribution, we include contributions from $c \bar c$ pairs that are produced at short distances in color-octet states. The color-octet contributions are suppressed by the smaller probability for the color-octet $c \bar c$ pair to evolve into a state that includes a $\psi$, but they may dominate near the upper endpoint of the $\psi$ energy spectrum. The signature for the color-octet contribution is a dramatic change in the angular distribution of the $\psi$ near the endpoint.

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