The analysis of the colour structure of two-gluon DPDs is incomplete in the original manuscript and needs to be extended. Consider a quantity with four adjoint indices that transforms like an overall colour singlet. One can first couple the indices pairwise to one of the combinations R = 1, A, S, 10, 10, 27. An overall singlet is then obtained if the colour representations two index pairs are in conjugate colour representations. This includes the cases where one pair is in the antisymmetric octet and the other in the symmetric octet. These cases were omitted in , see equations (6.a), (6.b) and (7) in that work. This mistake was repeated in equation (2.121) of .
Bibliographical noteErratum to: Transverse momentum in double parton scattering: factorisation, evolution and matching (Journal of High Energy Physics, (2018), 2018, 1, (44), DOI 10.1007/JHEP01(2018)044).
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