# Physics PAN Seminar: Helicity-dependent generalization of the JIMWLK evolution

This event is in the past.

**Date:**February 21, 2020

**Time:**3:30 p.m. - 4:30 p.m.

**Location:**Physics & Astronomy Department - Liberal Arts and Sciences #312

**Category:**Seminar

**Helicity-dependent generalization of the JIMWLK evolution**

Florian Cougoulic, The Ohio State University

Abstract*The small-x evolution equations for the quark and gluon helicity distribution have recently been constructed by finding sub-eikonal corrections to the eikonal shock wave formalism. Those equations are written for correlators of infinite light-cone Wilson lines along with the so-called polarized Wilson lines. Those equations close in the large $N_c$-limit ($N_c$ is the number of quark colors), but also in the large $N_c & N_f$-limit ($N_f$ is the number of quark flavors). However, in the shock wave formalism, no closed form can be obtained for arbitrary value of $N_c$ and $N_f$.**For the unpolarized case, the generalization of the Balitsky-Kovchegov equation is done by the Jalilian-Marian—Iancu—McLerran—Weigert—Leonidov—Kovner (JIMWLK) functional evolution equation. Such an approach for the small-x evolution of the helicity is beneficial for numerical evaluation at finite $N_c$ and $N_f$ (beyond previously used limit), and for the evaluation of helicity-dependent operator with an arbitrary number of Wilson lines. We derive an analogue of the JIMWLK evolution equation for the small-x evolution of helicity distributions and obtain an evolution equation for the target weight functional.*

## Contact

Gojko Vujanovic

6147492893