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Challenges in Monte Carlo event generator software for High-Luminosity LHC

arXiv:2004.13687
CERN-LPCC-2020-002

FERMILAB-PUB-20-183-SCD-T
MCNET-20-15

by: Valassi, Andrea (CERN) et al.

Abstract:
We review the main software and computing challenges for the Monte Carlo physics event generators used by the LHC experiments, in view of the High-Luminosity LHC (HL-LHC) physics programme. This paper has been prepared by the HEP Software Foundation (HSF) Physics Event Generator Working Group as an input to the upcoming LHCC review of HL-LHC computing, which is scheduled to start in May 2020.

Comments on a new `full colour' parton shower

arXiv:2003.06399
MAN/HEP/2020/001
UWTHPH-2020-9
MCnet-20-10

by: Holguin, Jack (Manchester U.) et al.

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.