Fragmentation, factorization and infrared poles in heavy quarkonium production

被引：82

作者：

Nayak, GC ^{[1
]}

Qiu, JW

Sterman, G

机构：

[1] SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

来源：

PHYSICS LETTERS B | 2005年 / 613卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/j.physletb.2005.03.031

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We explore the role of soft gluon exchange in heavy quarkonium production at large transverse momentum. We find uncanceled infrared poles at NNLO that are not matched by conventional NRQCD matrix elements. We show, however, that gauge invariance and factorization require that conventional NRQCD production operators be modified to include non-Abelian phases or Wilson lines. With appropriately modified operators, factorization is restored at NNLO. We also argue that, in the absence of special cancellations, infrared poles at yet higher orders may require the inclusion of additional nonlocal operators, not present in the NRQCD expansion in relative velocity. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：45 / 51

页数：7

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