Towards High-Energy Factorization at Full NLO for Quarkonium Production
Abstract
Heavy-quarkonium hadroproduction at the LHC can access kinematic configurations in which the partonic center-of-mass energy is much larger than the quarkonium mass and transverse momentum. Fixed-order predictions may become unstable in this regime because large logarithms of the collision energy are not resummed. Extending high-energy factorization beyond leading logarithms requires process-dependent impact factors at next-to-leading order (NLO). We report the first complete NLO BFKL impact factors, with exact heavy-quark-mass dependence, for the production of the NRQCD states 1S0[1], 1S0[8], and 3S1[8]. The real-emission calculation is combined with the previously known virtual corrections through a local subtraction procedure. Soft singularities cancel, initial-state collinear poles are absorbed into the parton distributions, and rapidity divergences are removed by BFKL factorization. These results provide the ingredients needed for full-NLL studies of forward quarkonium and of quarkonium-associated production with a large rapidity separation.
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BibTeX
@misc{fucilla2026towards,
title = {{Towards High-Energy Factorization at Full NLO for Quarkonium Production}},
author = {Michael Fucilla and Jean-Philippe Lansberg and Maxim Nefedov and Lech Szymanowski and Samuel Wallon},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.15942},
eprint = {2609.15942},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.15942},
}
RIS
TY - UNPB
TI - Towards High-Energy Factorization at Full NLO for Quarkonium Production
AU - Michael Fucilla
AU - Jean-Philippe Lansberg
AU - Maxim Nefedov
AU - Lech Szymanowski
AU - Samuel Wallon
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2609.15942
UR - https://arxiv.org/abs/2609.15942
AB - Heavy-quarkonium hadroproduction at the LHC can access kinematic configurations in which the partonic center-of-mass energy is much larger than the quarkonium mass and transverse momentum. Fixed-order predictions may become unstable in this regime because large logarithms of the collision energy are not resummed. Extending high-energy factorization beyond leading logarithms requires process-dependent impact factors at next-to-leading order (NLO). We report the first complete NLO BFKL impact factors, with exact heavy-quark-mass dependence, for the production of the NRQCD states ^1S_0^[1], ^1S_0^[8], and ^3S_1^[8]. The real-emission calculation is combined with the previously known virtual corrections through a local subtraction procedure. Soft singularities cancel, initial-state collinear poles are absorbed into the parton distributions, and rapidity divergences are removed by BFKL factorization. These results provide the ingredients needed for full-NLL studies of forward quarkonium and of quarkonium-associated production with a large rapidity separation.
ER -