Description
Over the past few years, it has become increasingly clear that standard soft-collinear factorization does not hold for hadron-collider observables in general. This breakdown is caused by Glauber effects, which destroy strict collinear factorization and color coherence. They impact many observables: Not only do they induce Super-Leading Logarithms (SLLs) in non-global jet cross sections, but Coherence-Violating Logarithms (CVLs) affect even the simplest global event shapes. In my talk, I will show how coherence violation can be systematically analyzed and accounted for in factorization theorems based on Soft-Collinear Effective Theory, and I will derive the leading CVL for N-jettiness. I will also explain an intricate mechanism that restores PDF factorization below the lowest perturbative scale in non-global observables.