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Parton showers beyond leading logarithmic accuracy

Authors
  • Dasgupta, Mrinal
  • Dreyer, Frédéric A.
  • Hamilton, Keith
  • Monni, Pier Francesco
  • Salam, Gavin P.
  • Soyez, Gregory
Publication Date
Mar 13, 2020
Source
HAL-ENAC
Keywords
Language
English
License
Unknown
External links

Abstract

Parton showers are among the most widely used tools in collider physics. Despite their key importance, none so far has been able to demonstrate accuracy beyond a basic level known as leading logarithmic (LL) order, with ensuing limitations across a broad spectrum of physics applications. In this letter, we propose criteria for showers to be considered next-to-leading logarithmic (NLL) accurate. We then introduce new classes of shower, for final-state radiation, that satisfy the main elements of these criteria in the widely used large-$N_C$ limit. As a proof of concept, we demonstrate these showers' agreement with all-order analytical NLL calculations for a range of observables, something never so far achieved for any parton shower.

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