Prompt hadroproduction of ηc(1S, 2S) in the kT-factorization approach
Izabela Babiarz, Roman Pasechnik, Wolfgang Schäfer, Antoni Szczurek
Abstract
A bstract In this work, we present a thorough analysis of η c (1 S, 2 S ) 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 (1 S, 2 S ) 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 $$ c\overline{c} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> <mml:mover> <mml:mi>c</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> interaction potential consistent with the meson spectra. We compare our results for η c (1 S ) to measurements by the LHCb collaboration and present predictions for η c (2 S ) production.