CSS and CGC: making sense of longitudinal momentum fraction vs longitudinal resolution in high energy evolution

by Alex Kovner (University of Connecticut (US))

Thursday 20 Feb 2025, 10:30 → 12:30 Europe/Zurich

4/3-001 (CERN)

I explain how to evolve observables which depend on two longitudinal momentum variables (momentum $x$ and resolution $\zeta$) at high energy. I show that such observables evolve according to JIMWLK equation up to rapidity  $\ln 1/x$, while further evolution up to $\zeta$ is given by the double logarithmic CSS equation.

CSS@CERN.pdf