Measurement of the Bjorken Sum at very low $Q^2$

A. Deur, J. P. Chen, S. E. Kuhn +17

We present new data on the Bjorken sum ${\overline{\Gamma }}_1^{p-n}(Q^2)$ at 4-momentum transfer $0.021\le Q^2\le 0.496$ GeV${}^2$. The data were obtained in two experiments performed a…