Perturbative QCD analysis of exclusive J/ψ+η_c production in e^+e^- annihilation

Details Perturbative QCD analysis of exclusive J/ψ+η_c production in e^+e^- annihilation Perturbative QCD analysis of exclusive J/ψ+η_c production in e^+e^- annihilation

2007-07-09

arxiv.org/abs/0707.1173v2

Phys.Rev.D76:094010,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 6figures; added 2 more figures; version to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.76.094010

We analyze the exclusive charmonium $J/\psi+\eta_c$ pair production in $e^+e^-$ annihilation using the nonfactorized perturbative QCD and the light-front quark model(LFQM) that goes beyond the peaking approximation. We effectively include all orders of higher twist terms in the leading order of QCD coupling constant and compare our nonfactorized analysis with the usual factorized analysis in the calculation of the cross section. We also calculate the quark distribution amplitudes, the Gegenbauer moments, and the decay constants for $J/\psi$ and $\eta_c$ mesons using our LFQM. Our nonfactorized result enhances the NRQCD result by a factor of $3\sim4$ at $\sqrt{s}=10.6$ GeV.

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