Transverse spin structure of hadrons from lattice QCD

被引：5

作者：

Broemmel, D. ^{[1
]}

Diehl, A. ^{[1
]}

Goeckeler, A. ^{[1
]}

Haegler, Ph. ^{[1
]}

Horsley, R. ^{[1
]}

Nakamura, Y. ^{[1
]}

Pleiter, D. ^{[1
]}

Rakow, P. E. L. ^{[1
]}

Schaefer, A. ^{[1
]}

Schierholz, G. ^{[1
]}

Stueben, H. ^{[1
]}

Zanotti, J. M. ^{[1
]}

机构：

[1] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

来源：

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 61, NO 1 | 2008年 / 61卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

lattice QCD; GPDs; transverse spin;

D O I：

10.1016/j.ppnp.2007.12.035

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

This paper presents recent lattice QCD calculations of transverse spin densities of quarks in hadrons.(2) Based on our simulation results for the tensor generalized form factors, we find substantial correlations between spin and coordinate degrees of freedom in the nucleon and the pion. They lead to strongly distorted transverse spin densities of quarks in the nucleon and a surprisingly non-trivial transverse spin structure of the pion. Following recent arguments by Burkardt [M. Burkardt, Phys. Rev. D 72 (2005) 094020], our results imply that the Boer-Mulders function h (perpendicular to)(1), describing correlations of the transverse spin and intrinsic transverse momentum of quarks, is large and negative for up-quarks in the proton and the pi(+). This supports the recent hypothesis that all Boer-Mulders functions are alike [arXiv:0705.1573], and also provides additional motivation for future studies of azimuthal asymmetries in pi p Drell-Yan production at, e.g., COMPASS. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：73 / 80

页数：8

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