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Central exclusive production of $\eta_c$ and $\chi_{c0}$ in the light-front k$_{\perp}$-factorization approach

Izabela Babiarz, Roman Pasechnik, Wolfgang Schäfer, Antoni Szczurek

SciPost Phys. Proc. 8, 118 (2022) · published 13 July 2022

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We study the exclusive production of $J^{PC}=0^{++}, 0^{--}$ charmonium states in proton-proton collisions at the LHC energies. The amplitudes for $g^*g^*→\chi_{c0}$ as well as for$ gg→\eta_c$ mechanisms are derived in the kT-factorization approach. The $pp \to pp\eta_c$ reaction is discussed for the first time. We observe a substantial contribution from the nonperturbative domain of gluon virtualities, especially for $\eta_c$ production. To model the nonperturbative region better, we utilize models of the unintegrated gluon distribution based on parametrizations of the color dipole cross-section.

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