QCD Corrections to e+e-→J/ψ plus gg at B Factories

被引：77
作者：
Ma, Yan-Qing [1 ,2 ]
Zhang, Yu-Jie [1 ,2 ]
Chao, Kuang-Ta [1 ,2 ,3 ]
机构：
[1] Peking Univ, Dept Phys, Beijing 100871, Peoples R China
[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
[3] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 16期
基金：
中国国家自然科学基金;
关键词：
J/PSI PRODUCTION; E(+)E(-); ANNIHILATION;
D O I：
10.1103/PhysRevLett.102.162002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In heavy quarkonium production, the measured ratio R-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(+)e(-)-> J/psi+gg can enhance the cross section by about 20%. Together with the calculated NLO result for e(+)e(-)-> J/psi+cc, we show that the NLO corrections can significantly improve the fit to the ratio R-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(+)e(-)-> J/psi+gg with the observed cross section for e(+)e(-)-> J/psi+non-(cc) is expected to provide unique information on the issue of color-octet contributions.
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页数：4
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