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Helicity-Dependent Showers and Matching with VINCIA

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arxiv 1301.0933 v2 pith:N7WCLCTP submitted 2013-01-05 hep-ph

Andrew J. Larkoski , Juan J. Lopez-Villarejo , Peter Skands This is my paper
classification hep-ph
keywords matchingshowersdecayformalismglobalgluonshelicityhelicity-dependent
verification ladder T0 review T1 audit T2 compute T3 formal
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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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  1. Sudakov evolution without unitarity

    hep-ph 2025-06 accept novelty 7.0 of 10

    Sunshine removes Sudakov factors from parton-shower sampling by keeping every intermediate state, giving direct tree-level expansions and enabling tests of matrix-element corrections.

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