Higher-order corrections to exclusive production of charmonia at B factories

Abstract

As a test of the color-singlet mechanism of the nonrelativistic QCD (NRQCD) factorization approach, we consider the exclusive two-quarkonium productions in electron-positron annihilation e+ e- -> eta_c + gamma and e+ e- -> J/psi + J/psi at B factories. The cross sections are computed to the next-to-leading order in alpha_s and are resummed to all orders in half the relative velocity v of the charm quark in each meson rest frame. The available theoretical prediction of the cross section for e+ e- -> J/psi + eta_c at the same level of theoretical accuracies is consistent with the available experimental data. Those for e+ e- -> eta_c + gamma and e+ e- -> J/psi + J/psi that are computed new in this work can be tested against the data from future super B factories.

9 pages, to appear in the proceedings of The 5th International Workshop on Charm Physics (Charm 2012)

References in corpus (8)

• Improved determination of color-singlet nonrelativistic QCD matrix elements for S-wave charmonium
• QCD corrections to J/psi plus eta_c production in e+e- annihilation at sqrt{s}=10.6 GeV
• QCD corrections to double J/ψproduction in e+e- annihilation at \sqrt{s}=10.6 GeV
• NRQCD matrix elements for S-wave bottomonia and Gamma[eta_b(nS) -> gamma gamma] with relativistic corrections
• $O({\alpha }_s{v}^2)$ Corrections to Hadronic and Electromagnetic Decays of ${}^1{S}_0$ Heavy Quarkonium
• Factorization theorems for exclusive heavy-quarkonium production
• Exclusive heavy quarkonium + gamma production from e+ e- annihilation into a virtual photon
• Relativistic corrections to the axial vector and vector currents in the bar{b}c meson system at order alpha_s