Four-denominator angular phase-space integrals are computed to O(epsilon^0) in dimensional regularization and expressed in GPLs for massless and massive momenta.
Schellekens, PERTURBATIVE QCD AND LEPTON PAIR PRODUCTION (6, 1981)
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Angular phase-space integrals with four denominators through Mellin--Barnes
Four-denominator angular phase-space integrals are computed to O(epsilon^0) in dimensional regularization and expressed in GPLs for massless and massive momenta.