Color-singlet J/psi production at O(alpha(6)(s)) in gamma decay
He, ZG; Wang, JX; 刘波(理)
刊名PHYSICAL REVIEW D
2010
卷号82期号:9页码:94033
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.82.094033
通讯作者[He, Zhi-Guo ; Wang, Jian-Xiong] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; [He, Zhi-Guo ; Wang, Jian-Xiong] Chinese Acad Sci, Ctr Theoret Phys, Sci Facil, Beijing 100049, Peoples R China ; [He, Zhi-Guo] Univ Barcelona, Fac Fis, Dept Estruct & Constituents Mat, E-08028 Barcelona, Catalonia, Spain ; [He, Zhi-Guo] Univ Barcelona, Inst Ciencies Cosmos, E-08028 Barcelona, Catalonia, Spain
文章类型Article
英文摘要To clarify the conflict between the theoretical predictions and experimental measurements of the inclusive J/psi production in gamma decay, we consider the alpha(6)(s) order color-singlet (CS) contributions of processes gamma -> J/psi + gg and gamma -> J/psi + gggg. Both the branching ratio and the J/psi momentum spectrum are calculated, and the branching ratio (4.7 x 10(-4)) is larger than the leading- order contribution (alpha(5)(s), gamma -> J/psi + c (c) over barg). Together with the QCD and QED leading- order contributions considered in our previous work, the CS prediction of the branching ratio for the direct J/psi production is Br(gamma -> J/psi(direct) + X) = 0.90(-0.31)(+0.49) X 10(-4), which is still about 3.8 times less than the CLEO measurement. We also obtain a preliminary CS prediction of R-cc = B(gamma -> J/psi + c (c) over bar + X)/B(gamma -> J/psi + X) and find that the value of 0.39(-0.20)(+0.21) is much larger than the color-octet prediction, and suggest to measure this quality in future experimental analysis.
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]Astronomy & Astrophysics ; Physics
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语种英语
WOS记录号WOS:000208475100003
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240885
专题中国科学院高能物理研究所_理论物理室_期刊论文
作者单位中国科学院高能物理研究所
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He, ZG,Wang, JX,Liu B. Color-singlet J/psi production at O(alpha(6)(s)) in gamma decay[J]. PHYSICAL REVIEW D,2010,82(9):94033.
APA He, ZG,Wang, JX,&刘波.(2010).Color-singlet J/psi production at O(alpha(6)(s)) in gamma decay.PHYSICAL REVIEW D,82(9),94033.
MLA He, ZG,et al."Color-singlet J/psi production at O(alpha(6)(s)) in gamma decay".PHYSICAL REVIEW D 82.9(2010):94033.
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