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A framework for second-order parton showers

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arxiv 1611.00013 v3 pith:JHYZEK3F submitted 2016-10-31 hep-ph

Hai Tao Li , Peter Skands This is my paper
classification hep-ph
keywords alphasframeworkimplementationkernelspartonsecond-ordershowersaccurate
verification ladder T0 review T1 audit T2 compute T3 formal
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A framework is presented for including second-order perturbative corrections to the radiation patterns of parton showers. The formalism allows to combine O(alphaS^2)-corrected iterated 2->3 kernels for "ordered" gluon emissions with tree-level 2->4 kernels for "unordered" ones. The combined Sudakov evolution kernel is thus accurate to O(alphaS^2). As a first step towards a full-fledged implementation of these ideas, we develop an explicit implementation of 2->4 shower branchings in this letter.

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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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