Parton branching at amplitude level

Jeffrey Forshaw, Jack Holguin, Simon Plätzer

Research output: Contribution to journalArticlepeer-review

Abstract

We present an algorithm that evolves hard processes at the amplitude level by dressing them iteratively with (massless) quarks and gluons. The algorithm interleaves collinear emissions with soft emissions and includes Coulomb/Glauber exchanges. It includes all orders in Nc, is spin dependent and is able to accommodate kinematic recoils. Although it is specified at leading logarithmic accuracy, the framework should be sufficient to go beyond. Coulomb exchanges make the factorisation of collinear and soft emissions highly non-trivial. In the absence of Coulomb exchanges, we show how factorisation works out and how a partial factorisation is manifest in the presence of Coulomb exchanges. Finally, we illustrate the use of the algorithm by deriving DGLAP evolution and computing the resummed thrust, hemisphere jet mass and gaps-between-jets distributions in e+e−.

Original languageEnglish
Number of pages54
JournalThe Journal of High Energy Physics
Volume2019
Issue number145
DOIs
Publication statusPublished - 26 Aug 2019

Keywords

  • hep-ph

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