Prompt hadroproduction of η_c(1S, 2S) in the k_T-factorization approach

Summary, in English

In this work, we present a thorough analysis of η_c(1S, 2S) quarkonia hadroproduction in k_⊥-factorisation in the framework of the light-front potential approach for the quarkonium wave function. The off-shell matrix elements for the g^*g^*η_c(1S, 2S) vertices are derived. We discuss the importance of taking into account the gluon virtualities. We present the transverse momentum distributions of η_c for several models of the unintegrated gluon distributions. Our calculations are performed for four distinct parameterisations for the cc¯ interaction potential consistent with the meson spectra. We compare our results for η_c(1S) to measurements by the LHCb collaboration and present predictions for η_c(2S) production.