Spin orbit correlations and the structure of the nucleon

被引：17

作者：

Avakian, H. ^{[1
]}

Parsmyan, B. ^{[2
]}

Prokudin, A. ^{[1
,3
]}

机构：

[1] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[2] CERN, CH-1211 Geneva 23, Switzerland

[3] Penn State Berks, Reading, PA 19610 USA

来源：

RIVISTA DEL NUOVO CIMENTO | 2019年 / 42卷 / 01期

基金：

美国国家科学基金会;

关键词：

DEEP-INELASTIC-SCATTERING; ODD DISTRIBUTION-FUNCTIONS; MONTE-CARLO GENERATOR; DRELL-YAN; AZIMUTHAL ASYMMETRIES; PARTON DISTRIBUTIONS; FRAGMENTATION FUNCTIONS; TRANSVERSE-MOMENTUM; SIVERS ASYMMETRIES; CHIRAL-ODD;

D O I：

10.1393/ncr/i2019-10155-3

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Extensive experimental measurements of spin and azimuthal asymmetries in various processes have stimulated theoretical interest and progress in the studies of the nucleon structure. The interpretation of experimental data in terms of parton distribution functions, generalized to describe transverse momentum and spatial parton distributions, is one of the main remaining challenges of modern nuclear physics. These new parton distribution and fragmentation functions encode the motion and the position of partons and are often referred to as three-dimensional distributions describing the three-dimensional (3D) structure of the nucleon. Understanding of the production mechanism and performing phenomenological studies compatible with factorization theorems using minimal model assumptions are goals of the analysis of the experimental data. HERMES and COMPASS Collaborations and experiments at Jefferson Lab have collected a wealth of polarized and unpolarized Semi-Inclusive Deep Inelastic Scattering (SIDIS) data. These data play a crucial role in current understanding of nucleon spin phenomena as they cover a broad kinematical range. The Jefferson Lab 12 GeV upgrade data on polarized and unpolarized SIDIS will have a remarkably higher precision at large parton fractional momentum x compared to the existing data. We argue that both experimental and phenomenological communities will benefit from the development of a comprehensive extraction framework that will facilitate the extraction of the 3D nucleon structure, help understand various assumptions in extraction and data analysis, help to insure the model independence of the experimental data and validate the extracted functions. In this review we present the latest developments in the field of the spin asymmetries with emphasis on observables beyond the leading twist in SIDIS, indispensable for studies of the complex 3D nucleon structure, and discuss different components involved in precision extraction of the 3D partonic distribution and fragmentation functions.

引用

页码：1 / 48

页数：48

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