Abstract
At small inter-parton distances, double parton distributions receive their dominant contribution from the splitting of a single parton. We compute this mechanism at next-to-leading order in perturbation theory for all colour configurations of the observed parton pair. Rapidity divergences are handled either by using spacelike Wilson lines or by applying the δ regulator. We investigate the behaviour of the two-loop contributions in different kinematic limits, and we illustrate their impact in different channels.
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Diehl, M., Gaunt, J.R. & Plößl, P. Two-loop splitting in double parton distributions: the colour non-singlet case. J. High Energ. Phys. 2021, 40 (2021). https://doi.org/10.1007/JHEP08(2021)040
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DOI: https://doi.org/10.1007/JHEP08(2021)040