XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects

Central exclusive production of ηc and χc0 in the light-front kT-factorization approach

15 Apr 2021, 09:12

18m

Virtual (Stony Brook, NY)

Contributed Talk Small-x, Diffraction and Vector Mesons Small-x, Diffraction and Vector Mesons

Speaker

Izabela Babiarz (Institute of Nuclear Physics Polish Academy of Sciences)

Description

We study the exclusive production of $J^{PC}=0^{++}$ and $0^{--}$ charmonium states in proton-proton collisions at the LHC energies. The amplitudes for $gg\to {\chi }_{c0}$ as well as for $gg\to {\eta }_c$ mechanisms are derived in the $k_T$-factorization approach. The $pp\to pp{\eta }_c$ reaction is discussed for the first time. We have discussed rapidity and transverse momentum distributions as well as such correlation observables as the distribution in relative azimuthal angle and $(t_1,t_2)$ distributions.The latter two observables are very different for the scalar and pseudoscalar meson.
We present the numerical results for the key observables in the framework of potential models for the light-front quarkonia wave functions. We also discuss how different are the absorptive corrections for both considered cases.
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.

Based on:
I.Babiarz, R.Pasechnik, W.Schafer and A.Szczurek,
"Central exclusive production of scalar and pseudoscalar charmonia in the light-front $k_T$-factorization approach", Phys. Rev. D $\mathbf{\text{102}}$, 114028 (2020)[arXiv:2008.05462 [hep-ph]].

Presentation materials

Babiarz_DIS2021.pdf

Youtube Link