Abstract
We compute in conventional dimensional regularisation the tree-level splitting amplitudes for a gluon parent which splits into four collinear partons. This is part of the universal infrared behaviour of the QCD scattering amplitudes at next-to-next-to-next-to-leading order (N3LO) in the strong coupling constant. Combined with our earlier results for a quark parent, this completes the set of tree-level splitting amplitudes required at this order. We also study iterated collinear limits where a subset of the four collinear partons become themselves collinear.
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ArXiv ePrint: 2007.05345
On leave from INFN, Laboratori Nazionali di Frascati, Italy. (Vittorio Del Duca)
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Del Duca, V., Duhr, C., Haindl, R. et al. Tree-level splitting amplitudes for a gluon into four collinear partons. J. High Energ. Phys. 2020, 93 (2020). https://doi.org/10.1007/JHEP10(2020)093
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DOI: https://doi.org/10.1007/JHEP10(2020)093