Speaker
Description
Status of Next-to-Leading order calculation of the High-Energy Factorization coefficient function for the inclusive heavy-quarkonium photoproduction will be presented. The one-loop correction to the leading-order process:
R(q1) + gamma(q) -> c\bar{c} [1S0^(8)],
where R-Reggeized gluon with four-momentum q1=x1P1+qT1, qT1.P1=0, will be discussed within an effective-action framework described in Ref.[1]. An important new ingredient of the calculation is the rapidity-divergent one-loop integral with massive internal line, which should be calculated. An important cross-check of factorization is possible with this process, since the known one-loop rapidity divergence should factorize-out, despite color-octet final-state.
The LL BFKL analysis of the energy-dependence of total cross-section of eta_c production can be also discussed in the talk.
References:
[1] M.A.Nefedov, Computing one-loop corrections to effective vertices with two scales in the EFT for Multi-Regge processes in QCD,
Nucl. Phys. B \textbf{946}, 114715 (2019)
doi:10.1016/j.nuclphysb.2019.114715
[arXiv:1902.11030 [hep-ph]].
