Photoproduction of $η_c$ in NRQCD

Details Photoproduction of $η_c$ in NRQCD Photoproduction of $η_c$ in NRQCD

1999-02-13

arxiv.org/abs/hep-ph/9902338v1

Phys.Rev.Lett.83:4490-4493,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, revtex, 4 ps figures

Scientific paper

10.1103/PhysRevLett.83.4490

We present a calculation for the photoproduction of $\eta_c$ under the framework of NRQCD factorization formalism. We find a quite unique feature that the color-singlet contribution to this process vanishes at not only the leading order but also the next to leading order perturbative QCD calculations and that the dominant contribution comes from the color-octet ${}^1S_0^{(8)}$ subprocess. The nonperturbative color-octet matrix element of ${}^1S_0^{(8)}$ of $\eta_c$ is related to that of ${}^3S_1^{(8)}$ of $J/\psi$ by the heavy quark spin symmetry, and the latter can be determined from the direct production of $J/\psi$ at large transverse momentum at the Fermilib Tevatron. We then conclude that the measurement of this process may clarify the existing conflict between the color-octet prediction and the experimental result on the $J/\psi$ photoprodution.

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