Orateur
Description
Based on the recently obtained result [1] for the virtual corrections for the impact factor $g+R \to c\bar{c}$ ($R$-Reggeized gluon) with the $c\bar{c}$ pair being in the $^1S_0^{[1]}$ state, which is relevant for the forward-rapidity production of the $\eta_c$ meson, we compute the real-emission correction to this impact factor: $g+R \to c\bar{c}+g$ analyze the structure and cancellation of the IR divergences between real-emission and virtual corrections and the rapidity divergence in the combined result. The result had been obtained with the help of the tilted Wilson line regularisation for rapidity divergences, but the relation with other regularisation prescriptions (BFKL, $k^+$ cut, $k^-$ cut) will be presented.
[1] M.Nefedov https://arxiv.org/abs/2309.09608
