Prompt hadroproduction of ηc(1S, 2S) in the kT-factorization approach

Abstract

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.

Hadroproduction of scalar P -wave quarkonia in the light-front kT -factorization approach

“…The corresponding results differ at small transverse momenta p T , in the peak region of the distribution. A similar behaviour was observed recently for the production of η c in [14].…”

“…In the NRQCD matrix element we applied R (0) = 0.25 GeV 5/2 (the extracted value from the experimental radiative decay width, see table 6). In figure 12 we compare our results for χ c0 and χ b0 production with that for η c (1S) production from our recent analysis [14]. The cross section for χ c0 production is almost an order of magnitude smaller than that for η c (1S) production.…”

“…[5][6][7][8][9][10][11][12]. Here, we continue our investigation [13,14] of quarkonia production observables in the framework of the k ⊥ -factorisation approach [15][16][17][18][19] in the color-singlet formulation employing the light-front quarkonia wave functions. The previous works in refs.…”

“…In our recent study [13,14] we discussed inclusive production of pseudoscalar η c (1S, 2S) charmonia in proton-proton collisions. We explicitly calculated the corresponding electromagnetic γ * + γ * → η c (1S, 2S) form factors as functions of photon virtualities.…”

Intrinsic charm in the nucleon and charm production at large rapidities in collinear, hybrid and kT-factorization approaches

“…in the context of η c or χ c production [56,57] where the kinematics is similar. For Ω 2 we can take Ω 2 = min(m t , k 2 1t , k 2 2t ) or just Ω 2 = m 2 t .…”