Vincia for Hadron Colliders

Understand

We present the first public implementation of antenna-based QCD initial- and final-state showers.

• The shower kernels are $2\to 3$ antenna functions, which capture not only the collinear dynamics but also the leading soft (coherent) singularities of QCD matrix elements.
• We define the evolution measure to be inversely proportional to the leading poles, hence gluon emissions are evolved in a $p_\perp$ measure inversely proportional to the eikonal, while processes that only contain a single pole (e.g., $g\to q\bar{q}$) are evolved in virtuality.
• Non-ordered emissions are allowed, suppressed by an additional power of $1/Q^2$.