Spin and chirality effects in antler-topology processes at high energy (Formula presented.) colliders

We perform a model-independent investigation of spin and chirality correlation effects in the antler-topology processes (Formula presented.) at high-energy (Formula presented.) colliders with polarized beams. Generally the production process (Formula presented.) can occur not only through the s-channel exchange of vector bosons, (Formula presented.), including the neutral Standard Model (SM) gauge bosons, (Formula presented.) and Z, but also through the s- and t-channel exchanges of new neutral states, (Formula presented.) and (Formula presented.), and the u-channel exchange of new doubly charged states, (Formula presented.). The general set of (non-chiral) three-point couplings of the new particles and leptons allowed in a renormalizable quantum field theory is considered. The general spin and chirality analysis is based on the threshold behavior of the excitation curves for (Formula presented.) pair production in (Formula presented.) collisions with longitudinal- and transverse-polarized beams, the angular distributions in the production process and also the production-decay angular correlations. In the first step, we present the observables in the helicity formalism. Subsequently, we show how a set of observables can be designed for determining the spins and chiral structures of the new particles without any model assumptions. Finally, taking into account a typical set of approximately chiral invariant scenarios, we demonstrate how the spin and chirality effects can be probed experimentally at a high-energy (Formula presented.) collider.