Les Houches 2023 -- Physics at TeV Colliders: Report on the Standard Model Precision Wishlist
Alexander Huss, Joey Huston, Stephen Jones, Mathieu Pellen, Raoul Röntsch
TL;DR
The paper addresses the gap between experimental precision at the LHC and the corresponding Standard Model predictions by updating the Les Houches precision wishlist. It surveys progress in fixed-order computations and the essential ingredients (PDFs, amplitudes, subtraction methods) since 2021, outlining remaining gaps to reach anticipated experimental accuracy. Key advances highlighted include first $2\to3$ hadron-collider calculations, development of $2$-loop $5$-point amplitudes, improved subtraction schemes, and automation of SM corrections including NLO EW, as well as public tools for distributing NNLO predictions. It also discusses PDF determinations, benchmarking across major sets, and strategies to handle missing $N^{3}$LO PDFs and higher-order uncertainties to minimize their impact on predictions. Together these provide a practical roadmap for future theory work to satisfy experimental demands.
Abstract
Les Houches returned to an in-person format in 2023 and the bi-yearly tradition of updating the standard model precision wishlist has continued. In this work we review recent progress (since Les Houches 2021) in fixed-order computations for LHC applications. In addition, necessary ingredients for such calculations such as parton distribution functions, amplitudes, and subtraction methods are discussed. Finally, we indicate processes and missing higher-order corrections that are required to reach the theoretical accuracy that matches the anticipated experimental precision.