The g2 Structure Function

Burkardt, Matthias

doi:10.1063/1.3203298

Title: The g2 Structure Function

Full Record
Other Related Research

Abstract

Polarized structure functions at low $Q^2$ have the physical interpretation of (generalized) spin polarizabilities. At high $Q^2$, the polarized parton distribution $$g_2(x)$$ provides access to quark-gluon correlations in the nucleon. We discuss the interpretation of the $x^2$ moment of $$\bar{g}_2(x)$$ as an average transverse force on quarks in deep-inelastic scattering from a transversely polarized target. Qualitative connections with generalized parton distributions are emphasized. The $x^2$ moment of the chirally-odd twist-3 parton distribution $e(x)$ provides information on the dependence of the average transverse force on the transversity of the quark.

Authors:: Burkardt, Matthias

Publication Date:: Wed Jul 01 00:00:00 EDT 2009

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

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1018946

Report Number(s):: JLAB-THY-09-986; DOE/OR/23177-0724; arXiv:0905.4079
TRN: US1103507

DOE Contract Number:: AC05-06OR23177

Resource Type:: Conference

Journal Name:: AIP Conf.Proc.

Additional Journal Information:: Journal Volume: 1155; Conference: International Workshop on Positrons at Jefferson Lab (JPOS 09), Newport News, Virginia, 25-27 Mar 2009.

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DISTRIBUTION; POLARIZED TARGETS; POSITRONS; QUARKS; SCATTERING; SPIN; STRUCTURE FUNCTIONS

Citation Formats


                    Burkardt, Matthias. The g2 Structure Function.  United States: N. p., 2009. 
        Web.  doi:10.1063/1.3203298.

Copy to clipboard


                    Burkardt, Matthias. The g2 Structure Function.  United States.  https://doi.org/10.1063/1.3203298

Copy to clipboard


                    Burkardt, Matthias. 2009.  
        "The g2 Structure Function".  United States.  https://doi.org/10.1063/1.3203298.  https://www.osti.gov/servlets/purl/1018946.

Copy to clipboard


                    
@article{osti_1018946,

  title        = {The g2 Structure Function},

  author       = {Burkardt, Matthias},

  abstractNote = {Polarized structure functions at low $Q^2$ have the physical interpretation of (generalized) spin polarizabilities. At high $Q^2$, the polarized parton distribution $g_2(x)$ provides access to quark-gluon correlations in the nucleon. We discuss the interpretation of the $x^2$ moment of $\bar{g}_2(x)$ as an average transverse force on quarks in deep-inelastic scattering from a transversely polarized target. Qualitative connections with generalized parton distributions are emphasized. The $x^2$ moment of the chirally-odd twist-3 parton distribution $e(x)$ provides information on the dependence of the average transverse force on the transversity of the quark.},

  doi          = {10.1063/1.3203298},

  url          = {https://www.osti.gov/biblio/1018946},
  journal      = {AIP Conf.Proc.},
number       = ,

  volume       = 1155,

  place        = {United States},

  year         = {Wed Jul 01 00:00:00 EDT 2009},

  month        = {Wed Jul 01 00:00:00 EDT 2009}

}

Copy to clipboard

Conference:

View Conference

https://doi.org/10.1063/1.3203298

Other availability

Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

The g{sub 2} Structure Function

Journal Article Burkardt, Matthias - AIP Conference Proceedings

Polarized structure functions at low Q{sup 2} have the physical interpretation of (generalized) spin polarizabilities. At high Q{sup 2}, the polarized parton distribution g{sub 2}(x) provides access to quark-gluon correlations in the nucleon. We discuss the interpretation of the x{sup 2} moment of g-bar{sub 2}(x) as an average transverse force on quarks in deep-inelastic scattering from a transversely polarized target. Qualitative connections with generalized parton distributions are emphasized. The x{sup 2} moment of the chirally-odd twist-3 parton distribution e(x) provides information on the dependence of the average transverse force on the transversity of the quark.
https://doi.org/10.1063/1.3203298
Transverse Force on Quarks in DIS

Journal Article Burkardt, Matthias - Physical Review D

The $x^2$-moment of the twist-3 polarized parton distribution $$g_2(x)$$ is related to the transverse force acting on the active quark in deep-inelastic scattering off a transversely polarized nucleon immediately after it has absorbed the virtual photon. Lattice calculations of the corresponding matrix element as well as experimental measurements of $$g_2(x)$$ are used to estimate sign and magnitude of this force. Similarly, the $x^2$-moment of the chirally odd twist-3 unpolarized parton distribution $e(x)$ can be related to the transverse force experienced by a transversely polarized quark ejected from a transversely polarized nucleon.
Full Text Available
New Results on Nucleon Spin Structure

Conference Chen, Jian-Ping

Recent precision spin structure data from Jefferson Lab have significantly advanced our knowledge of nucleon structure in the valence quark (high-x) region and improved our understanding of higher-twist effects, spin sum rules and quark-hadron duality. First, results of a precision measurement of the neutron spin asymmetry, A{sub 1}{sup n}, in the high-x region are discussed. The new data shows clearly, for the first time, that A{sub 1}{sup n} becomes positive at high x. They provide crucial input for the global fits to world data to extract polarized parton distribution functions. Preliminary results on A{sub 1}{sup p} and A{sub 1}{sup d}more »« less
Full Text Available
Beam Spin Asymmetry Measurements of Deeply Virtual $$π$$⁰ Production with CLAS12

Journal Article Kim, A.; Diehl, S.; Joo, K.; ... - Physics Letters. B

The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive $$π$$⁰ production in a wide kinematic region with the photon virtualities $$Q$$² up to 8 GeV² and the Bjorken scaling variable $$x$$_$$B$$ in the valence regime. The data were collected by the CE BAF Large Acceptance Spectrometer (CLAS12) at Jefferson Lab with longitudinally polarized 10.6 GeV electrons scattered on an unpolarized liquid-hydrogen target. Sizable asymmetry values indicate a substantial contribution from transverse virtual photon amplitudes to the polarized structure functions. The interpretation of these measurements in terms of the Generalized Parton Distributions (GPDs) demonstrates theirmore »« less
https://doi.org/10.1016/j.physletb.2024.138459

Full Text Available
Measurements of $d_{2}^{n}$ and $A_{1}^{n}$ : Probing the neutron spin structure

Journal Article Flay, D.; Posik, M.; Parno, D.; ... - Physical Review D

We report on the results of the E06-014 experiment performed at Jefferson Lab in Hall A, where a precision measurement of the twist-3 matrix element $$d_2$$ of the neutron ($$d_{2}^{n}$$) was conducted. This quantity represents the average color Lorentz force a struck quark experiences in a deep inelastic electron scattering event off a neutron due to its interaction with the hadronizing remnants. This color force was determined from a linear combination of the third moments of the spin structure functions $$g_1$$ and $$g_2$$ on $$^{3}$$He after nuclear corrections had been applied to these moments. The kinematics included two average $$Q^{2}$$more »« less
Cited by 25
https://doi.org/10.1103/PhysRevD.94.052003

Full Text Available

Similar Records