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Malin Sjödahl

Malin Sjödahl

Senior lecturer, docent

Malin Sjödahl

Color matrix element corrections for parton showers

Author

  • Simon Plätzer
  • Malin Sjodahl
  • Johan Thorén

Summary, in English

We investigate the effects of keeping the full color structure for parton emissions in parton showers for both LEP and LHC. This is done within the Herwig 7 dipole shower, and includes gluon emission, gluon splitting, initial state branching processes, as well as hadronization. The subleading Nc terms are included as color matrix element corrections to the splitting kernels by evolving an amplitude-level density operator and correcting the radiation pattern for each parton multiplicity, up to a fixed number of full color emissions, after which a standard leading color shower takes over. Our results are compared to data for a wide range of LEP and LHC observables and show that the subleading Nc corrections tend to be small for most observables probing hard, perturbative dynamics, for both LEP and LHC. However, for some of these observables they exceed 10%. On soft physics we find signs of significantly larger effects.

Department/s

  • Theoretical Particle Physics - Has been reorganised

Publishing year

2018-11-05

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2018

Issue

11

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • QCD Phenomenology

Status

Published

Project

  • Innovative Network for Monte Carlo Event Generators for LHC Physics

ISBN/ISSN/Other

  • ISSN: 1029-8479