Ying-Jia Gao

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One of the most challenging open problems in heavy quarkonium physics is the double charm production in e+e- annihilation at B factories. The measured cross section of e+e- --> J/psi + eta(c) is much larger than leading order (LO) theoretical predictions. With the nonrelativistic QCD factorization formalism, we calculate the next-to-leading order (NLO) QCD(More)
In the framework of QCD factorization, we study the B meson exclusive decays B → χcJK where the spin-triplet P-wave charmonium states χcJ(J = 0, 1, 2) are described by the color-singlet nonrelativistic wave functions. We find that for these decays (except χc1) there are infrared divergences arising from nonfactorizable vertex corrections as well as(More)
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