High-energy logarithms and precision at the LHC
Abstract
We address the breakdown of fixed-order perturbation theory due to logarithms in s/pt2 for processes involving two jets or more at the energies currently explored at the LHC. The problem manifests itself in various ways: an obvious breakdown of the perturbative series for some kinematic distributions, highly asymmetric scale variations in other distributions, and the need for an artificially large renormalisation scale to even achieve numerical stability. As we demonstrate, the problem is solved through the resummation of these high-energy logarithms. The customary choice of a large renormalisation scale of mj1j2 offers no systematic resolution. This breakdown in fixed order predictions is illustrated for the production of Z+dijets. We show that resummed predictions obtained using \HighEJ matched to fixed order obtain accurate predictions for all the relevant distributions investigated in a recent ATLAS measurement.
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BibTeX
@misc{andersen2026highenergy,
title = {{High-energy logarithms and precision at the LHC}},
author = {Jeppe R. Andersen and Sebastian Jaskiewicz and Andreas Maier and Jennifer M. Smillie},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.36023},
eprint = {2609.36023},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.36023},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - High-energy logarithms and precision at the LHC
AU - Jeppe R. Andersen
AU - Sebastian Jaskiewicz
AU - Andreas Maier
AU - Jennifer M. Smillie
PY - 2026
DA - 2026/09/28
PB - arXiv
DO - 10.48550/arxiv.2609.36023
UR - https://arxiv.org/abs/2609.36023
AB - We address the breakdown of fixed-order perturbation theory due to logarithms in s/p_t^2 for processes involving two jets or more at the energies currently explored at the LHC. The problem manifests itself in various ways: an obvious breakdown of the perturbative series for some kinematic distributions, highly asymmetric scale variations in other distributions, and the need for an artificially large renormalisation scale to even achieve numerical stability. As we demonstrate, the problem is solved through the resummation of these high-energy logarithms. The customary choice of a large renormalisation scale of m_j_1j_2 offers no systematic resolution. This breakdown in fixed order predictions is illustrated for the production of Z+dijets. We show that resummed predictions obtained using \HighEJ matched to fixed order obtain accurate predictions for all the relevant distributions investigated in a recent ATLAS measurement.
ER -