[RBRC Seminar] Color-glass condensate beyond the Gaussian approximation

by Jan Penttala

Thursday May 1, 2025, 12:30 PM → 2:30 PM US/Eastern

2-160 (https://bnl.zoomgov.com/j/1600983728?pwd=RAD7OLcqre7Ycsp6JfFp6HAnpyLxex.1)

In the high-energy limit, perturbative calculations in QCD are conveniently done using the dipole picture which factorizes the scattering amplitude into a perturbative part and the nonperturbative scattering off the nuclear target, described using correlators of Wilson lines. These correlators can be computed in the color-glass condensate effective field theory by using a Gaussian probability distribution for the color density of the target. In this talk, I will discuss a generalization of the Gaussian approximation to a generic probability distribution for the color field strength that is local in the transverse coordinates and the light-cone time. I will show how to compute the dipole amplitude in this model and outline the generalization to higher-order correlators. I will also discuss a specific model based on stable probability distributions and show that the small-dipole behavior of the dipole amplitude is modified from quadratic to a generic power law.