Comments on a new `full colour' parton shower

Abstract

A new parton shower algorithm has been presented with the claim of providing soft-gluon resummation at `full colour' (arXiv:2001.11492). In this paper we show that the algorithm does not succeed in this goal. We show that full colour accuracy requires the Sudakov factors to be defined at amplitude level and that the simple parton-shower unitarity argument employed in arXiv:2001.11492 is not sufficient.

arXiv comment7 pages

References in corpus (7)

• Subleading Nc improved Parton Showers
• Parton showers with quantum interference: leading color, with spin
• Parton showers with more exact color evolution
• Color matrix element corrections for parton showers
• Summing Large-N Towers in Colour Flow Evolution
• Hemisphere jet mass distribution at finite $N_c$
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Cited by in corpus (4)

• Resummation and simulation of soft gluon effects beyond leading colour
• Numerical resummation at subleading color in the strongly ordered soft gluon limit
• Designing Observables for Quantum Interference in Jets at Subleading Color
• Towards Colour Flow Evolution at Two Loops