Are there approximate relations among transverse momentum dependent distribution functions?

被引：54
作者：
Avakian, H. [1 ]
Efremov, A. V. [2 ]
Goeke, K. [3 ]
Metz, A. [3 ,4 ]
Schweitzer, P. [3 ]
Teckentrup, T. [3 ]
机构：
[1] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA
[2] Joint Inst Nucl Res, Dubna 141980, Russia
[3] Ruhr Univ Bochum, Inst Theoret Phys 2, D-44780 Bochum, Germany
[4] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA
来源：
PHYSICAL REVIEW D | 2008年 / 77卷 / 01期
关键词：
D O I：
10.1103/PhysRevD.77.014023
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Certain exact relations among transverse momentum dependent parton distribution functions due to QCD equations of motion turn into approximate ones upon the neglect of pure twist-3 terms. On the basis of available data from HERMES, we test the practical usefulness of one such "Wandzura-Wilczek-type approximation," namely, of that connecting h(1L)(perpendicular to(1)a)(x) to h(L)(a)(x), and discuss how it can be further tested by future CLAS and COMPASS data.
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页数：9
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