DOE OSTI · 3365688
Accelerating LHC event generation with simplified pilot runs and fast PDFs
Abstract
High-precision calculations are an indispensable ingredient for the success of the LHC physics programme, yet their poor computing efficiency has been a growing cause for concern, threatening to become a paralysing bottleneck in the coming years. We present solutions to eliminate the apprehension by focussing on two major components of generalpurpose Monte Carlo event generators: the evaluation of parton distribution functions, and the generation of perturbative matrix elements. We show that for the cost-driving event samples employed by the ATLAS experiment to model omnipresent, irreducible Standard Model backgrounds, such as weak boson or top-quark pair production in association with jets, these computational components dominate the overall run time by up to 80 %. We demonstrate that a reduction of the computing footprint of LHAPDF and SHERPA by factors of around 40 can be achieved for multi-leg NLO event generation.
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Bothmann, Enrico [Gottingen U.], Buckley, Andy [Glasgow U.], Christidi, Ilektra A. [U. Coll. London], Gütschow, Christian [University Coll. London] (ORCID:000000030857794X), Höche, Stefan [Fermilab], Knobbe, Max [Gottingen U.; Glasgow U.], Martin, Tim [Warwick U.], Schönherr, Marek [Durham U., IPPP]. 2026-01-01. Accelerating LHC event generation with simplified pilot runs and fast PDFs. https://doi.org/10.1088/1742-6596%2F3206%2F1%2F012119
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