Light-cone divergence in twist-3 correlation functions

被引：54
|
作者：
Gamberg, L. P.
Hwang, D. S.
Metz, A. [1 ]
Schlegel, M.
机构：
[1] Ruhr Univ Bochum, Inst Theoret Phys 2, D-44780 Bochum, Germany
[2] Sejong Univ, Dept Phys, Seoul 143747, South Korea
[3] Penn State Berks, Div Sci, Reading, PA 19610 USA
来源：
PHYSICS LETTERS B | 2006年 / 639卷 / 05期
关键词：
DEEP-INELASTIC SCATTERING; SINGLE-SPIN ASYMMETRIES; FINAL-STATE INTERACTIONS; ODD FRAGMENTATION FUNCTIONS; AZIMUTHAL ASYMMETRIES; PARTON DISTRIBUTIONS; TRANSVERSE-MOMENTUM; DRELL-YAN; SEMIINCLUSIVE DIS; HARD-SCATTERING;
D O I：
10.1016/j.physletb.2006.07.005
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
It is argued that the definition of the twist-3 transverse momentum dependent correlation functions must be modified if they contain light-like Wilson lines. In the framework of a simple spectator model of the nucleon we show explicitly the presence of a light-cone divergence for a specific twist-3 time-reversal odd parton density. This divergence emerges for all eight twist-3 T-odd correlators and appears also in the case of a quark target in perturbative QCD. The divergence can be removed by using non-light-like Wilson lines. Based on our results we argue that currently there exists no established factorization formula for transverse momentum dependent twist-3 observables in semi-inclusive DIS and related processes. (c) 2006 Elsevier B.V. All rights reserved.
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页码：508 / 512
页数：5
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