NLO Impact Factors for Heavy quarkonium production: S-wave case

by Dr Maxim Nefedov (Ben Gurion University of Negev, Beer-Sheva, Israel)

Friday 20 Mar 2026, 13:00 → 14:00 Europe/Helsinki

We present the first complete next-to-leading-order calculation of the impact factors for hadroproduction of the 1S0[1]​, 1S0[8]​, and 3S1[8]​  NRQCD states within the BFKL formalism. We complete the recent virtual-correction computation presented in JHEP 12 (2024) 129 by that of the real-emission contributions. We observe the cancellation of the soft divergences between these real- and virtual-emission contributions and we note that the surviving collinear singularities are compatible with factorisation up to one loop for a novel class of processes where BFKL resummation can be applied. Our work indeed represents the first complete NLO quarkonium impact factor in the BFKL framework and paves the way to first next-to-leading-logarithmic-precision studies for hadroproduction of forward-backward quarkonium associated production at hadron colliders.

Nefedov_Juvaskyla-2026.pdf