# Some hadronic parameters of charmonia in $$\varvec{N_{\text {f}}=2}$$ lattice QCD

The European Physical Journal C, Dec 2018

The phenomenology of leptonic decays of quarkonia holds many interesting features: for instance, it can establish constraints on scenarios beyond the Standard Model with the Higgs sector enriched by a light CP-odd state. In the following paper, we report on a two-flavor lattice QCD study of the $$\eta _c$$ and $$J/\psi$$ decay constants, $$f_{\eta _c}=387(3)(3)\, {\mathrm{MeV}}$$ and $$f_{J/\psi }=399(4)(2)\, {\mathrm{MeV}}$$. We also examine some properties of the first radial excitation $$\eta _c(2S)$$ and $$\psi (2S)$$.

This is a preview of a remote PDF: https://link.springer.com/content/pdf/10.1140%2Fepjc%2Fs10052-018-6495-4.pdf

Gabriela Bailas, Benoît Blossier, Vincent Morénas. Some hadronic parameters of charmonia in $$\varvec{N_{\text {f}}=2}$$ lattice QCD, The European Physical Journal C, 2018, 1018, DOI: 10.1140/epjc/s10052-018-6495-4