Small-x resummation from Glauber SCET

• Aditya Pathak (DESY)

Room: A.1.01/03 - Alps The high energy limit of QCD is a storehouse of rich phenomenology. In this limit, perturbative series receive logarithmic (small-x) enhancements associated with wide-rapidity separations necessitating their all-order resummation. However, reliably and comprehensively incorporating the next-to-leading logarithmic (NLL) corrections associated with this limit consistent with collinear resummation and PDF factorization has been a longstanding challenge. Existing approaches rely somewhat heavily on the simplifications that break down beyond leading logarithmic accuracy, making their higher-order extension challenging. In this talk I will describe recent progress in tacking this problem using the Glauber extension of soft collinear effective theory (SCET). In my work [JHEP 09 (2023) 089], I derived a factorization theorem for small-x resummation in DIS. This work constitutes the first resummation via EFT in the high energy limit and has provided a promising approach for higher order extension. I will also briefly comment on first steps towards computing the NLL small-x logarithms in this approach.