Threshold factorization of the Drell-Yan quark-gluon channel and two-loop soft function at next-to-leading power

Alessandro Broggio, Sebastian Jaskiewicz, Leonardo Vernazza

We present a factorization theorem of the partonic Drell-Yan off-diagonal processes $g\bar{q}(qg)\to {\gamma }^{\ast }+X$ in the kinematic threshold regime $z=Q^2/\hat{s}\to 1$ at general…