Document Type

Article

Publication Date

2014

DOI

10.1103/PhysRevD.90.012009

Publication Title

Physical Review D

Volume

90

Issue

1

Pages

012009 (1-8)

Abstract

We present a significantly improved determination of the Bjorken sum for 0.6 ≤ Q2 ≤ 4.8 GeV2 using precise new gp1 and gd1 data taken with the CLAS detector at Jefferson Lab. A higher-twist analysis of the Q2 dependence of the Bjorken sum yields the twist-4 coefficient f p-n2= -0.064 ± 0.009 ± 0.032 0.036. This leads to the color polarizabilities χ p-n E= -0.032 ± 0.024 and χp-nB= 0.032 ± 0.013. The strong force coupling is determined to be α MSS (M2Z) = 0.1123 ± 0.0061, which has an uncertainty a factor of 1.5 smaller than earlier estimates using polarized deep inelastic scattering (DIS) data. This improvement makes the comparison between alpha sub(s) extracted from polarized DIS and other techniques a valuable test of QCD.

Comments

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Original Publication Citation

Deur, A., Prok, Y., Burkert, V., Crabb, D., Girod, F. X., Griffioen, K. A., . . . Kvaltine, N. (2014). High precision determination of the Q² evolution of the Bjorken sum. Physical Review D, 90(1), 012009. doi:10.1103/PhysRevD.90.012009

ORCID

0000-0003-2243-6836 (Kuhn)

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