Two ideas are presented in this work. First, we show that a more carefu treatment of the hard scattering amplitude in perturbative QCD is not necessarily in disagreement with the experimental data for the proton-proton spin asymmetry A, . The previous bound of A,,,, < 1/3 is attributed to the spectator approximation. NN NN ^J However, the perturbative framework of QCD cannot be reconciled with ...

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A modification of the one boson exchange (OBE) kernel for covariant spectator theory (CST) is presented and discussed. When applied to scattering two identical particles, previously used kernels either introduced spurious singularities, or removed them in an ad-hoc way. The new not only removes these but also maintains convergence two-body CST equation (sometimes called Gross equation) when des...