Resummation of relativistic corrections to e{sup +}e{sup -}{yields}J/{psi}+{eta}{sub c}
- High Energy Physics Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439 (United States)
- Department of Physics, Korea University, Seoul 136-701 (Korea, Republic of)
We present a new calculation, in the nonrelativistic QCD (NRQCD) factorization formalism, of the relativistic corrections to the double-charmonium cross section {sigma}[e{sup +}e{sup -}{yields}J/{psi}+{eta}{sub 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}{sub s}. We also present a detailed estimate of the theoretical uncertainty. We conclude that the discrepancy between the theoretical prediction for {sigma}[e{sup +}e{sup -}{yields}J/{psi}+{eta}{sub c}] and the experimental measurements has been resolved.
- OSTI ID:
- 21250124
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 77, Issue 9; Other Information: DOI: 10.1103/PhysRevD.77.094018; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHARMONIUM
COMPARATIVE EVALUATIONS
CORRECTIONS
CROSS SECTIONS
ELECTRON-POSITRON COLLISIONS
ETA MESONS
FACTORIZATION
FORECASTING
FRAGMENTATION
INTERFERENCE
J PSI-3097 MESONS
MATRIX ELEMENTS
QUANTUM CHROMODYNAMICS
QUANTUM ELECTRODYNAMICS
RELATIVISTIC RANGE
VECTOR MESONS