Speaker
Description
The predictions relevant for two recent measurements by ATLAS have highlighted the necessity of developing methods to systematically tackle the intricate behaviour of large logarithmic corrections in the perturbative series in order for predictions to be accurate and useful. Specifically, the analysis of the processes of the production of at least two jets ($pp\to jj$ [https://arxiv.org/abs/2405.20206]) and the production of a hard photon or an electroweak vector boson in association with at least two jets ($pp\to\{\gamma,Z,W}+jj$ [https://arxiv.org/abs/2403.02793]) all indicate systematic deviations from data with increasing partonic collision energy for e.g. fixed order perturbative predictions. Perturbative predictions taking into account the source of the large logarithmic corrections at high energies on the other hand obtain stable predictions of data [https://arxiv.org/abs/2403.02793, https://arxiv.org/abs/2506.17438].
While the high energy logarithmic corrections to the perturbative series have been studied for some time, this is the first conclusive demonstration of the need for their inclusion in standard analyses at the LHC. The predictions for photon+dijets taking into account the effects of high energy resummation was presented in https://arxiv.org/abs/2506.17438. In this talk we will present new results for the process Z+dijets, which confirm the dominance of the logarithmic terms in the NLO fixed-order results, and confirm the resolution of the logarithmic problem by an all-order resummation, which also compares favouably to experimental data. Finally, we discuss the merits of scale choices in fixed-order calculations of order the partonic collision energy.