Abstract
We consider Zγ production in hadronic collisions and present the first computation of next-to-next-to-leading order accurate predictions consistently matched to parton showers (NNLO+PS). Spin correlations, interferences and off-shell effects are included by calculating the full process pp → ℓ+ℓ−γ. We extend the recently developed MiNNLOPS method to genuine 2 → 2 hard scattering processes at the LHC, which paves the way for NNLO+PS simulations of all diboson processes. This is the first 2 → 2 NNLO+PS calculation that does not require an a-posteriori multi-differential reweighting. We find that both NNLO corrections and matching to parton showers are crucial for an accurate simulation of the Zγ process. Our predictions are in very good agreement with recent ATLAS data.
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Lombardi, D., Wiesemann, M. & Zanderighi, G. Advancing MıNNLOPS to diboson processes: Zγ production at NNLO+PS. J. High Energ. Phys. 2021, 95 (2021). https://doi.org/10.1007/JHEP06(2021)095
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DOI: https://doi.org/10.1007/JHEP06(2021)095