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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