Towards higher-order calculations of quarkonia production with -factorization: P-wave charmoniaS. P. Baranov, A. V. Lipatov, A. A. Prokhorov and X. ChenEur. Phys. J. C, 84 4 (2024) 348DOI: https://doi.org/10.1140/epjc/s10052-024-12690-0