Precision Measurements of Aⁿ1 in the Deep Inelastic Regime

Authors

D. S. Parno
D. Flay
M. Posik
M. Canan, Old Dominion University
C. Hyde, Old Dominion University
The Jefferson Lab Hall A Collaboration

Document Type

Article

Publication Date

2015

DOI

10.1016/j.physletb.2015.03.067

Publication Title

Physics Letters B

Volume

744

Pages

309-314

Abstract

We have performed precision measurements of the double-spin virtual-photon asymmetry A₁ on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer and a longitudinally and transversely polarized ³He target. Our data cover a wide kinematic range 0.277 <= x <= 0.548 at an average Q² value of 3.078(GeV/c)², doubling the available high-precision neutron data in this xrange. We have combined our results with world data on proton targets to make a leading-order extraction of the ratio of polarized-to-unpolarized parton distribution functions for up quarks and for down quarks in the same kinematic range. Our data are consistent with a previous observation of an Aⁿ₁zero crossing near x = 0.5. We find no evidence of a transition to a positive slope in (Δd + Δ¯d)/(d +¯d) up to x = 0.548.

Comments

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), funded by SCOAP³.

Original Publication Citation

Parno, D. S., Flay, D., Posik, M., Allada, K., Armstrong, W., Averett, T., . . . Zheng, X. (2015). Precision measurements of Aⁿ₁ in the deep inelastic regime. Physics Letters B, 744, 309-314. doi:10.1016/j.physletb.2015.03.067

ORCID

0000-0001-7282-8120 (Hyde)

Repository Citation

Parno, D. S.; Flay, D.; Posik, M.; Canan, M.; Hyde, C.; and The Jefferson Lab Hall A Collaboration, "Precision Measurements of Aⁿ1 in the Deep Inelastic Regime" (2015). Physics Faculty Publications. 149.
https://digitalcommons.odu.edu/physics_fac_pubs/149