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Evolution of parton showers and parton distribution functions

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arxiv 2002.04125 v2 pith:LRVLT627 submitted 2020-02-10 hep-ph

Zoltán Nagy , Davison E. Soper This is my paper · ORCID
classification hep-ph
keywords partondistributionfunctionspropertydeductorevolutionexamineinitial
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Initial state evolution in parton shower event generators involves parton distribution functions. We examine the probability for the system to evolve from a higher scale to a lower scale without an initial state splitting. A simple argument suggests that this probability, when multiplied by the ratio of the parton distributions at the two scales, should be independent of the parton distribution functions. We call this the PDF property. We examine whether the PDF property actually holds using Pythia and Deductor. We also test a related property for the Deductor shower and discuss the physics behind the results.

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  1. Soft-gluon coupling and the TMD parton branching Sudakov form factor

    hep-ph 2024-12 conditional novelty 6.0 of 10

    The parton branching TMD framework is upgraded from NLL to NNLL accuracy using the soft-gluon physical coupling, with the Collins-Soper kernel evaluated at NNLL.

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