The non-first-order-factorizable contributions to the three-loop single-mass operator matrix elements A^(3)_Qg and ∆A^(3)_Qg
elements to three-loop order, A(3) Qg and ∆A(3) Qg, are calculated in the single- mass case. For the 2F1-related master integrals of the problem, we use a semi-analytic method based on series expansions and [...] highly precise series expansions to obtain the imaginary part of the physical amplitude for x ∈]0, 1] at a high relative accuracy. We compare the present results both with previous analytic results, the …
