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题名: NRQCD factorization and universality of NRQCD matrix elements
作者: Ma, JP ;  Si, ZG
刊名: PHYSICS LETTERS B
出版日期: 2005
卷号: 625, 期号:40910, 页码:67-75
关键词: TO-LEADING ORDER ;  ROOT S=1.8 TEV ;  HEAVY QUARKONIUM ;  P(P)OVER-BAR COLLISIONS ;  GLUON FRAGMENTATION ;  J/PSI ;  QCD ;  ANNIHILATION ;  DECAY
学科分类: Physics
通讯作者: Ma, JP , Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China.
部门归属: Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; Shandong Univ, Dept Phys, Jinan 250100, Shandong, Peoples R China
英文摘要: The approach of nonrelativistic QCD (NRQCD) factorization was proposed to study inclusive production of a quarkonium. It is widely used and successful. However, a recent study of gluon fragmentation into a quarkonium at two-loop level,shows that the factorization is broken. It is suggested that the color-octet NRQCD matrix elements should be modified by adding a gauge link to restore the factorization. The modified matrix elements may have extra soft-divergences at one-loop level which the unmodified cannot have, and this can lead to a violation of the universality of these matrix elements. In this letter, we examine in detail the NRQCD factorization for inclusive quarkonium production in e+e(-) annihilation at one-loop level. Our results show that the factorization can be made without the modification of NRQCD matrix elements and it can also be made for relativistic corrections. It turns out that the suggested gauge link will not lead to nonzero contributions to color-octet NRQCD matrix elements at one-loop level and at any order of v. Therefore the universality holds at least at one-loop level. (c) 2005 Elsevier B.V. All rights reserved.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000232169300011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13736
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Ma, JP,Si, ZG. NRQCD factorization and universality of NRQCD matrix elements[J]. PHYSICS LETTERS B,2005,625(40910):67-75.
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