Double-real contribution to the quark beam function at N${}^3$LO QCD

Abstract

We compute the master integrals required for the calculation of the double-real emission contributions to the matching coefficients of 0-jettiness beam functions at next-to-next-to-next-to-leading order in perturbative QCD. As an application, we combine these integrals and derive the double-real gluon emission contribution to the matching coefficient $I_{qq}(t,z)$ of the quark beam function.

arXiv comment28 pages, 1 figure; updated ancillary file (accessible through url in the section "Results")

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