Aad, G.Abbott, B.Beddal, Andrew JohnÇetin, Serkant AliÖztürk, Sertaç2022-09-082022-09-082022Aad, G., Abbott, B., Beddal, A. J., Cetin, S. A., Ozturk, S. (2022). Modelling and computational improvements to the simulation of single vector-boson plus jet processes for the ATLAS experiment. Journal of High Energy Physics, (8).1029-8479https://doi.org/10.1007/JHEP08(2022)089https://hdl.handle.net/20.500.12713/3130This paper presents updated Monte Carlo configurations used to model the production of single electroweak vector bosons (W, Z/gamma*) in association with jets in proton-proton collisions for the ATLAS experiment at the Large Hadron Collider. Improvements pertaining to the electroweak input scheme, parton-shower splitting kernels and scale-setting scheme are shown for multi-jet merged configurations accurate to next-to-leading order in the strong and electroweak couplings. The computational resources required for these set-ups are assessed, and approximations are introduced resulting in a factor three reduction of the per-event CPU time without affecting the physics modelling performance. Continuous statistical enhancement techniques are introduced by ATLAS in order to populate low cross-section regions of phase space and are shown to match or exceed the generated effective luminosity. This, together with the lower per-event CPU time, results in a 50% reduction in the required computing resources compared to a legacy set-up previously used by the ATLAS collaboration. The set-ups described in this paper will be used for future ATLAS analyses and lay the foundation for the next generation of Monte Carlo predictions for single vector-boson plus jets production.eninfo:eu-repo/semantics/openAccessHadron-Hadron ScatteringArticle8WOS:0008386759000022-s2.0-85135791758Q110.1007/JHEP08(2022)089Q2