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arXiv · 0802.3198

Experimental study of isovector spin sum rules

A. Deur·P. Bosted·V. Burkert·D. Crabb·V. Dharmawardane·G. E. Dodge·T. A. Forest·K. A. Griffioen·S. E. Kuhn·R. Minehart·Y. Prok
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Abstract

We present the Bjorken integral extracted from Jefferson Lab experiment EG1b for $0.05<Q^{2}<2.92$ GeV$^2$. The integral is fit to extract the twist-4 element $f_{2}^{p-n}$ which appears to be relatively large and negative. Systematic studies of this higher twist analysis establish its legitimacy at $Q^{2}$ around 1 GeV$^{2}$. We also performed an isospin decomposition of the generalized forward spin polarizability $γ_{0}$. Although its isovector part provides a reliable test of the calculation techniques of Chiral Perturbation Theory, our data disagree with the calculations.

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A. Deur, P. Bosted, V. Burkert, D. Crabb, V. Dharmawardane, G. E. Dodge, T. A. Forest, K. A. Griffioen, S. E. Kuhn, R. Minehart, Y. Prok. 2008-09-24. Experimental study of isovector spin sum rules. https://doi.org/10.1103/physrevd.78.032001

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