QCD Corrections to e{sup +}e{sup -}{yields}J/{psi}+gg at B Factories
- Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)
In heavy quarkonium production, the measured ratio R{sub cc}={sigma}[J/{psi}+cc+X]/{sigma}[J/{psi}+X] at B factories is much larger than existing theoretical predictions. To clarify this discrepancy, in nonrelativistic QCD we find the next-to-leading-order (NLO) QCD correction to e{sup +}e{sup -}{yields}J/{psi}+gg can enhance the cross section by about 20%. Together with the calculated NLO result for e{sup +}e{sup -}{yields}J/{psi}+cc, we show that the NLO corrections can significantly improve the fit to the ratio R{sub cc}. The effects of leading logarithm resummation near the end point on the J/{psi} momentum distribution and total cross section are also considered. Comparison of the calculated cross section for e{sup +}e{sup -}{yields}J/{psi}+gg with the observed cross section for e{sup +}e{sup -}{yields}J/{psi}+non-(cc) is expected to provide unique information on the issue of color-octet contributions.
- OSTI ID:
- 21316634
- Journal Information:
- Physical Review Letters, Vol. 102, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.102.162002; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
Similar Records
Next-to-Leading-Order QCD Corrections to e{sup +}e{sup -}{yields}J/{psi}gg at the B Factories
Double-Charm Production e{sup +}e{sup -}{yields}J/{psi}+cc at B Factories with Next-to-Leading-Order QCD Corrections