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We perform a dedicated study of the $q \bar{q}$-initiated two-loopelectroweak-QCD Drell-Yan scattering amplitude in dimensional regularizationschemes for vanishing light quark and lepton masses. For the relative order$\alpha$ and $\alpha_s$ one-loop Standard Model corrections, details of ourcomparison to the original literature are given. The infrared pole terms of themixed two-loop amplitude are governed by a known generalization of the dipoleformula and we show explicitly that exactly the same two-loop polarized hardscattering functions are obtained in both the standard 'tHooft-Veltman-Breitenlohner-Maison $\gamma_5$ scheme and Kreimer'santicommuting $\gamma_5$ scheme.

Mixed EW-QCD two-loop amplitudes for $q\bar{q} \to \ell^+\ell^-$ and $\gamma_5$ scheme independence of multi-loop corrections