Relativistic calculations for NN-NΔscattering with pion andρexchange

The NN scattering Bethe-Salpeter equation is solved for $T=1\mathrm{}$ partial wave amplitudes up to 1 GeV lab energy. Coupling to $\mathrm{N}\Delta$ intermediate states is included by $\pi$ and $\rho$ exchange, while NN ↔ NN interactions are due to combined $\pi$, $\rho$, $\eta$, $\epsilon$, $\delta$, and $\omega$ mesons. Inclusion of $\rho$ exchange improves agreement with phase shift analysis in a systematic way.