Abstract
We present next-to-leading order perturbative QCD predictions for four-jet-like event-shape observables in hadronic Higgs decays. To this end, we take into account two Higgs-decay categories: involving either the Yukawa-induced decay to a \({\text{b}}\overline{{\text{b}} }\) pair or the loop-induced decay to two gluons via an effective Higgs-gluon-gluon coupling. We present results for distributions related to the event-shape variables thrust minor, light-hemisphere mass, narrow jet broadening, D-parameter, and Durham four-to-three-jet transition variable. For each of these observables we study the impact of higher-order corrections and compare their size and shape in the two Higgs-decay categories. We find large NLO corrections with a visible shape difference between the two decay modes, leading to a significant shift of the peak in distributions related to the H → gg decay mode.
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Acknowledgments
The authors are grateful to Stefano Pozzorini for helpful advices on the renormalisation schemes used in OpenLoops2. The authors also wish to thank Damien Geissbühler for his contribution to the computation of observables in the Hgg category at an early stage of this project. CTP and AG are supported by the Swiss National Science Foundation (SNF) under contract 200021-197130 and by the Swiss National Supercomputing Centre (CSCS) under project ID ETH5f. CW is supported by the National Science Foundation through awards NSF-PHY-1652066 and NSF-PHY-201402.
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Gehrmann-De Ridder, A., Preuss, C.T. & Williams, C. Four-jet event shapes in hadronic Higgs decays. J. High Energ. Phys. 2024, 104 (2024). https://doi.org/10.1007/JHEP03(2024)104
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DOI: https://doi.org/10.1007/JHEP03(2024)104