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Next-to-leading-order QCD correction to inclusive J/psi(Y) production in Z(0) decay
Li R(李荣); Wang JX(王建雄); Li, R; Wang, JX
2010
发表期刊PHYSICAL REVIEW D
卷号82期号:5页码:54006
通讯作者[Li, Rong] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; CAS, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China
文章类型Article
摘要In this paper, we study the J/psi(Y) production in Z boson decay in a color-singlet model (CSM). We calculate the next-to-leading-order (NLO) QCD correction to Z -> quarkonium + Q (Q) over bar, the dominant contribution in the CSM, with the vector and axial-vector parts in the ZQ (Q) over bar vertex being treated separately. The results show that the vector and axial-vector parts have the same K factor (the ratio of the NLO result to the leading-order result) 1.13 with the renormalization scale mu = 2m(c) and m(c) 1.5 GeV, and the K factor falls to 0.918 when applying the Brodsky, Lepage, and Mackenzie (BLM) renormalization scale scheme with obtained mu(BLM) 2.28 GeV and m(c) = 1.5 GeV. By including the contributions from the next-dominant ones, the photon and gluon fragmentation processes, the branching ratio for Z -> J/psi prompt + X is (7.3-10.0) x 10(-5) with the uncertainty consideration for the renormalization scale and charm quark mass. The results are about one-half of the central value of the experimental measurement 2.1 x 10(-4). Furthermore, the J/psi energy distribution in our calculation cannot describe the experimental data. Therefore, even at QCD NLO, the contribution to Z -> J/psi(prompt) + X from the CSM cannot fully account for the experimental measurement. And there should be contributions from other mechanisms, such as the color-octet (COM) contributions. We define Rc (c) over bar = Gamma(Z-J/psi c (c) over barX)/Gamma(Z -> J/psi X) and obtain R-cc = 0.84 for only the CSM contribution and R-cc = 0.49 for COM and CSM contributions together. Then the Rcc measurement could be used to clarify the COM contributions.
学科领域Astronomy & Astrophysics; Physics
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
DOI10.1103/PhysRevD.82.054006
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语种英语
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000281644100001
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240660
专题理论物理室
作者单位中国科学院高能物理研究所
推荐引用方式
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Li R,Wang JX,Li, R,et al. Next-to-leading-order QCD correction to inclusive J/psi(Y) production in Z(0) decay[J]. PHYSICAL REVIEW D,2010,82(5):54006.
APA 李荣,王建雄,Li, R,&Wang, JX.(2010).Next-to-leading-order QCD correction to inclusive J/psi(Y) production in Z(0) decay.PHYSICAL REVIEW D,82(5),54006.
MLA 李荣,et al."Next-to-leading-order QCD correction to inclusive J/psi(Y) production in Z(0) decay".PHYSICAL REVIEW D 82.5(2010):54006.
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