  We present a complete set of helicity-dependent 2->3 antenna functions for
QCD initial- and final- state radiation. The functions are implemented in the
Vincia shower Monte Carlo framework and are used to generate showers for
hadron-collider processes in which helicities are explicitly sampled (and
conserved) at each step of the evolution. Although not capturing the full
effects of spin correlations, the explicit helicity sampling does permit a
significantly faster evaluation of fixed-order matrix-element corrections. A
further speed increase is achieved via the implementation of a new fast library
of analytical MHV amplitudes, while matrix elements from Madgraph are used for
non-MHV configurations. A few examples of applications to QCD 2->2 processes
are given, comparing the newly released Vincia 2.200 to Pythia 8.226.

High Energy Physics - Phenomenology