Some hadronic parameters of charmonia in ${\mathbf{N}}_{\text{f}}=2$ lattice QCD

Abstract

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, $f_{{\eta }_c}$ and $f_{J\psi }$. We also examine some properties of the first radial excitation ${\eta }_c(2S)$ and $\psi (2S)$.

13 pages, 67 gigures. arXiv admin note: text overlap with arXiv:1711.05661