33rd International Workshop on Deep Inelastic Scattering and Related Subjects (DIS2026)

Complete NLO BFKL impact factors for quarkonium hadroproduction in NRQCD: the case of ${}^1 S_0^{[1]}$, ${}^1S_0^{[8]}$, and ${}^3S_1^{[8]}$ states

5 May 2026, 15:10

20m

Sala SATURNO A, First Floor (Hotel Carlton)

Talk WG2 Small-x, Diffraction and Vector Mesons WG2 Small-x, diffraction and vector mesons

Speaker

Michael Fucilla

Description

Based on: https://arxiv.org/abs/2601.04142

We present the first complete next-to-leading-order calculation of the impact factors for hadroproduction of the ${}^1S_0^{[1]}$, ${}^1S_0^{[8]}$, and ${}^3S_1^{[8]}$ NRQCD states
within the BFKL formalism. We complete the recent virtual-correction computation presented in \href{https://doi.org/10.1007/JHEP12(2024)129}{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.

Presentation materials

Fucilla.pdf