Beam functions for $N$-jettiness at N${}^3$LO in perturbative QCD

Daniel Baranowski, Arnd Behring, Kirill Melnikov +2

We present a calculation of all matching coefficients for $N$-jettiness beam functions at next-to-next-to-next-to-leading order (N${}^3$LO) in perturbative quantum chromodynamics (QC…