Two-Loop Spacelike Splitting Amplitudes in Full-Color QCD

by Federico Buccioni

Monday Apr 13, 2026, 2:00 PM → 3:00 PM Europe/Zurich

4/3-006 - TH Conference Room (CERN)

The study of QCD scattering amplitudes in the collinear regime provides crucial insight into the factorization properties of hadronic cross sections. In this talk, I will present and discuss the first complete results for two-loop spacelike splitting amplitudes in full-color QCD. Our study confirms the universality of a class of contributions already found in N=4 super Yang--Mills (sYM) theory, and identify previously unknown sources of collinear factorization-violating (CFV) effects. Consistent with recent observations in N=4 sYM, all CFV contributions cancel in color-summed squared amplitudes, implying the universality of single-parton collinear factorization for jet cross sections at third order in QCD.

buccioni_QCD_CERN.pdf