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We present the calculation of all non-planar master integrals that are neededto describe production of two off-shell vector bosons in collisions of twomassless partons through NNLO in perturbative QCD. The integrals are computedanalytically using differential equations in external kinematic variables andexpressed in terms of Goncharov polylogarithms. These results provide the lastmissing ingredient needed for the computation of two-loop amplitudes thatdescribe the production of two gauge bosons with different invariant masses inhadron collisions.

Non-planar master integrals for the production of two off-shell vector bosons in collisions of massless partons