Spin Orbit Correlations and the Structure of the Nucleon

Avagyan, Harut A.; Parsamyan, Bakur; Prokudin, Alexei

doi:10.1393/ncr/i2019-10155-3

Title: Spin Orbit Correlations and the Structure of the Nucleon

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Abstract

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 comprehensivemore »« less

Authors:

^[1]; Parsamyan, Bakur ^[2];

^[3]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Penn State Berks, Reading, PA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Publication Date:: Wed Jan 23 00:00:00 EST 2019

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1505611

Report Number(s):: JLAB-THY-18-2708; DOE/OR/23177-4449
Journal ID: ISSN 0393-697X

Grant/Contract Number:: AC05-06OR23177; NSF PHY-1623454

Resource Type:: Accepted Manuscript

Journal Name:: Rivista del Nuovo Cimento della Societa Italiana di Fisica

Additional Journal Information:: Journal Volume: 42; Journal Issue: 1; Journal ID: ISSN 0393-697X

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Avagyan, Harut A., Parsamyan, Bakur, and Prokudin, Alexei. Spin Orbit Correlations and the Structure of the Nucleon.  United States: N. p., 2019. 
Web.  doi:10.1393/ncr/i2019-10155-3.

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                    Avagyan, Harut A., Parsamyan, Bakur, & Prokudin, Alexei. Spin Orbit Correlations and the Structure of the Nucleon.  United States.  https://doi.org/10.1393/ncr/i2019-10155-3

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                    Avagyan, Harut A., Parsamyan, Bakur, and Prokudin, Alexei. Wed .  
"Spin Orbit Correlations and the Structure of the Nucleon".  United States.  https://doi.org/10.1393/ncr/i2019-10155-3.  https://www.osti.gov/servlets/purl/1505611.

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@article{osti_1505611,

  title        = {Spin Orbit Correlations and the Structure of the Nucleon},

  author       = {Avagyan, Harut A. and Parsamyan, Bakur and Prokudin, Alexei},

  abstractNote = {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 paper 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.},

  doi          = {10.1393/ncr/i2019-10155-3},

  journal      = {Rivista del Nuovo Cimento della Societa Italiana di Fisica},

  number       = 1,

  volume       = 42,

  place        = {United States},

  year         = {Wed Jan 23 00:00:00 EST 2019},

  month        = {Wed Jan 23 00:00:00 EST 2019}

}

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