Charge Symmetry Breaking in Spin Dependent Parton Distributions and the   Bjorken Sum Rule
  We present the first determination of charge symmetry violation (CSV) in the spin-dependent parton distribution functions of the nucleon. This is done by determining the first two Mellin moments of the spin-dependent parton distribution functions of the octet baryons from N_f = 2 + 1 lattice simulations. The results are compared with predictions from quark models of nucleon structure. We discuss the contribution of partonic spin CSV to the Bjorken sum rule, which is important because the CSV contributions represent the only partonic corrections to the Bjorken sum rule. 
I. C. Clo\"et, R. Horsley, J. T. Londergan, Y. Nakamura, D. Pleiter,   P. E. L. Rakow, G. Schierholz, H. St\"uben, A. W. Tho...
hep-lat hep-ph nucl-th