Intrinsic quark transverse momentum in the nucleon from lattice QCD

被引：81
作者：
Haegler, Ph. [1 ]
Musch, B. U. [1 ]
Negele, J. W. [2 ]
Schaefer, A. [3 ]
机构：
[1] Tech Univ Munich, Dept Phys, Inst Theoret Phys T39, D-85747 Garching, Germany
[2] MIT, Ctr Theoret Phys, Boston, MA 02130 USA
[3] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany
来源：
EPL | 2009年 / 88卷 / 06期
关键词：
SPIN; ASYMMETRIES;
D O I：
10.1209/0295-5075/88/61001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A better understanding of transverse momentum (k(perpendicular to)) dependent quark distributions in a hadron is needed to interpret several experimentally observed large angular asymmetries and to clarify the fundamental role of gauge links in non-Abelian gauge theories. Based on manifestly non-local gauge-invariant quark operators we introduce process-independent k(perpendicular to) distributions and study their properties in lattice QCD. We find that the longitudinal and transverse momentum dependence approximately factorize, in contrast to the behavior of generalized parton distributions. The resulting quark k(perpendicular to) probability densities for the nucleon show characteristic dipole deformations due to correlations between intrinsic k(perpendicular to) and the quark or nucleon spin. Our lattice calculations are based on N-f = 2 + 1 mixed action propagators of the LHP Collaboration. Copyright (C) EPLA, 2009
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