Helicity-Dependent Showers and Matching with VINCIA
Andrew J. Larkoski, Juan J. Lopez-Villarejo, Peter Skands
TL;DR
This paper introduces a helicity-dependent antenna-shower formalism compatible with VINCIA's matching approach, improving computational efficiency for high multiplicity parton showers in particle physics simulations.
Contribution
It develops a novel helicity-dependent formalism for antenna showers and integrates it with VINCIA's matrix-element matching, enhancing speed and accuracy.
Findings
Significant speed-up in high multiplicity simulations
Successful implementation of sector and global showers
Effective helicity-dependent matching for complex decays
Abstract
We present an antenna-shower formalism that includes helicity dependence for massless partons. The formalism applies to both traditional (global) showers and to sector-based variants. We combine the shower with VINCIA's multiplicative approach to matrix-element matching, generalized to operate on each helicity configuration separately. The result is a substantial gain in computational speed for high parton multiplicities. We present an implementation of both sector and global showers, with min and max variations, and helicity-dependent tree-level matching applied for vector bosons or Higgs decay to q qbar plus up to 4 gluons and for Higgs decay to up to 5 gluons.
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