Published January 1, 2014 | Version v1
Miscellaneous

A precision measurement of the neutron2: probing the color force

  • 1. Temple Univ., Philadelphia, PA (United States)

Description

The g2 nucleon spin-dependent structure function measured in electron deep inelastic scattering contains information beyond the simple parton model description of the nucleon. It provides insight into quark-gluon correlations and a path to access the confining local color force a struck quark experiences just as it is hit by the virtual photon due to the remnant di-quark. The quantity d2, a measure of this local color force, has its information encoded in an x2 weighted integral of a linear combination of spin structure functions g1 and g2 and thus is dominated by the valence-quark region at large momentum fraction x. To date, theoretical calculations and experimental measurements of the neutron d2 differ by about two standard deviations. Therefore, JLab experiment E06-014, performed in Hall A, made a precision measurement of this quantity at two mean four momentum transfers values of 3.21 and 4.32 GeV2. Double spin asymmetries and absolute cross-sections were measured in both DIS and resonance regions by scattering longitudinally polarized electrons at beam energies of 4.74 and 5.89 GeV from a longitudinally and transversely polarized 3He target. Results for the absolute cross-sections and spin structure functions on 3He will be presented in the dissertation, as well as results for the neutron d2 and extracted color forces

Availability note (English)

Available from https://misportal.jlab.org/ul/publications/downloadFile.cfm?pub_id=13193; PURL: http://www.osti.gov/servlets/purl/1133070/

Additional details

Publishing Information

Imprint Pagination
560 p.
Report number
JLAB-PHY--14-1888

Optional Information

Contract/Grant/Project number
AC05-06OR23177
Funding organization
USDOE Office of Science, Nuclear Physics (United States)
Secondary number(s)
OSTIID--1133070; DOE/OR/23177--3080