Speaker
Description
A.V. Anufriev
Samara National Research University, Samara, 443086, Russia
V.A. Saleev
Samara National Research University, Samara, 443086, Russia and
Joint Institute for Nuclear Research, Dubna, 141980 Russia
Study of charmonium production at high energy in proton-proton collisions is important test of perturbative QCD, factorization approach and hadronization model in a heavy quark sector. There are many sets of experimental data for $J/\psi$, $\psi(2S)$ and $\chi_{cJ}$ production cross sections [1]. Oppositely, the only results of direct measurements was published by LHCb Collaboration for $\eta_c$ production cross section and transverse momentum spectrum [2]. In the article, we predict $\eta_c$ production cross sections on energies in range from $\sqrt{s}=27$ GeV up to 13 TeV for present and future proton-proton colliders to estimate opportunity of their experimental measurements. We perform our study using different factorization approaches such as Collinear Parton Model (CPM), Transverse Momentum Depended Parton Model (TMD PM) [3], Generalized Parton Model (GMP) and Parton Reggeization Approch (PRA) [4]. $\eta_c$ production cross section is also sensitive to hadronization model of $c\bar c-$pair in the final $\eta_c-$meson. We compare predictions for $\eta_c$ production cross sections using different hadronization models: Color Singlet Model, NRQCD approach and Color Evaporation Model (CEM).
[1] E. Chapon, D. d'Enterria, B. Ducloue, M. G. Echevarria, et al. Prospects for quarkonium studies at the high-luminosity LHC, Prog. Part. Nucl. Phys. 122 (2022), 103906
[2] R. Aaij, C. Abellan Beteta, B. Adeva et al. Measurement of the $\eta_c$(1S) production cross-section in proton-proton collisions via the decay $\eta_c$(1S)$\rightarrow$ $p\bar{p}$. The Eur. Phys. J. C vol. 75, 311 (2015), 579 (2017).
[3] J. Collins Foundations of perturbative QCD. Camb. Monogr. Part. Phys. Nucl. Phys. Cosmol. 32, 1-624 (2011).
[4] V. A. Saleev, M. A. Nefedov and A. V. Shipilova, Prompt $J/\psi$ production in the Regge limit of QCD: From Tevatron to LHC, Phys. Rev. D 85 (2012), 074013
