A Portable Parton-Level Event Generator for the High-Luminosity LHC

Abstract

The rapid deployment of computing hardware different from the traditional CPU+RAM model in data centers around the world mandates a change in the design of event generators for the Large Hadron Collider, in order to provide economically and ecologically sustainable simulations for the high-luminosity era of the LHC. Parton-level event generation is one of the most computationally demanding parts of the simulation and is therefore a prime target for improvements. We present a production-ready leading-order parton-level event generation framework capable of utilizing most modern hardware and discuss its performance in the standard candle processes of vector boson and top-quark pair production with up to five additional jets.

Comments: Submission to SciPost, 32 pages, 11 figures, 2 tables; this is a new version that contains extended discussions and additional content, in particular the new appendix E on CPU vectorization