Left-right spin asymmetry in lN ↑ → hX

被引：23

作者：

Gamberg, Leonard ^{[1
]}

Kang, Zhong-Bo ^{[2
]}

Metz, Andreas ^{[3
]}

Pitonyak, Daniel ^{[4
]}

Prokudin, Alexei ^{[5
]}

机构：

[1] Penn State Berks, Div Sci, Reading, PA 19610 USA

[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[3] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA

[4] Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA

[5] Jefferson Lab, Newport News, VA 23606 USA

来源：

PHYSICAL REVIEW D | 2014年 / 90卷 / 07期

基金：

美国国家科学基金会;

关键词：

SINGLE-SPIN; HARD-SCATTERING; DRELL-YAN; PI-X; FRAGMENTATION; PHYSICS;

D O I：

10.1103/PhysRevD.90.074012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider the inclusive production of hadrons in lepton-nucleon scattering. For a transversely polarized nucleon this reaction shows a left-right azimuthal asymmetry, which we compute in twist-3 collinear factorization at leading order in perturbation theory. All nonperturbative parton correlators of the calculation are fixed through information from other hard processes. Our results for the left-right asymmetry agree in sign with recent data for charged pion production from the HERMES Collaboration and from Jefferson Lab. However, the magnitude of the computed asymmetries tends to be larger than the data. Potential reasons for this outcome are identified. We also give predictions for future experiments and highlight in particular the unique opportunities at an electron ion collider.

引用

页数：12

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