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We compute the cross section for exclusive production of a photon associatedwith a heavy quarkonium H of charge-conjugation parity C=+1 from e+ e-annihilation into a virtual photon at the center-of-momentum energyroot-s=10.58 GeV. The NRQCD factorization formulas for the differential andtotal cross sections are obtained at leading order in the strong coupling andin the relative velocity of the heavy quark in the quarkonium rest frame. Thepredicted cross sections for the S-wave spin-singlet cases are about 80 fb and50 fb for H = eta_c and eta_c(2S), respectively. Among P-wave spin-tripletcharmonia, chi_{c1} has a particularly large cross section of about 14 fb. Thecross sections for bottomonium states eta_b and chi_{bJ} are about 3 fb. Arough estimate of the background reveals that the signal significances forcharmonium processes are sufficiently large enough to be detected with easewith the integrated luminosities available at the present B factories.

Exclusive heavy quarkonium + gamma production from e+ e- annihilation into a virtual photon