  Measurements of the production of forward jets from transversely polarized
proton collisions at $\sqrt{s}=500$ GeV conducted at the Relativistic Heavy Ion
Collider (RHIC) are reported. Our measured jet cross section is consistent with
hard scattering expectations. Our measured analyzing power for forward jet
production is small and positive, and provides constraints on the Sivers
functions that are related to partonic orbital angular momentum through
theoretical models.
