Pionic and hidden-color, six-quark contributions to the deuteron b1 structure function

The b(1) structure function is an observable feature of a spin-1 system sensitive to non-nucleonic components of the target nuclear wave function. The contributions of exchanged pions in the deuteron are estimated and found to be of measurable size for values of x of about 0.1. A simple model for a hidden-color, six-quark configuration (with similar to 0.15% probability to exist in the deuteron) is proposed and found to give substantial contributions for values of x > 0.2. Good agreement with Hermes data is obtained. Predictions are made for an upcoming JLab experiment. The Close and Kumano sum rule is investigated and found to be a useful guide to understanding various possible effects that may contribute.