Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-10-04
Phys.Rev.D77:094018,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 2 figures, minor corrections, version published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.77.094018
We present a new calculation, in the nonrelativistic QCD (NRQCD) factorization formalism, of the relativistic corrections to the double-charmonium cross section sigma[e+ e- -> J/psi+eta_c] at the energy of the Belle and BABAR experiments. In comparison with previous work, our calculation contains several refinements. These include the use of the improved results for the nonperturbative NRQCD matrix elements, the resummation of a class of relativistic corrections, the use of the vector-meson-dominance method to calculate the fragmentation contribution to the pure QED amplitude, the inclusion of the effects of the running of alpha, and the inclusion of the contribution that arises from the interference between the relativistic corrections and the corrections of next-to-leading order in alpha_s. We also present a detailed estimate of the theoretical uncertainty. We conclude that the discrepancy between the theoretical prediction for sigma[e+e- -> J/psi+eta_c] and the experimental measurements has been resolved.
Bodwin Geoffrey T.
Lee Jungil
Yu Chaehyun
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