Search for compositeness and leptophobic gauge bosons (with polarized beams)

In a first step, we explore the discovery and analysis potentials of the HERA collider, with and without polarized beams, in the search for electron-quark compositeness in the neutral current channel. Then we study the parity violating effects, for jet production in polarized $pp$ collisions at RHIC, which could be due to the presence of quark subconstituents or new massive gauge bosons. We emphasize that the measurement of spin asymmetries in such a polarized context could give some crucial informations on the chiral structure of these hypothetical new interactions.