We study charmonium and bottomonium as relativistic bound states in a
light-front quantized Hamiltonian formalism. The effective Hamiltonian is based
on light-front holography. We use a recently proposed longitudinal confinement
to complete the soft-wall holographic potential for the heavy flavors. The spin
structure is generated from the one-gluon exchange interaction with a running
coupling. The adoption of asymptotic freedom improves the spectroscopy compared
with previous light-front results. Within this model, we compute the mass
spectroscopy, decay constants and the r.m.s. radii. We also present a detailed
study of the obtained light-front wave functions and use the wave functions to
compute the light-cone distributions, specifically the distribution amplitudes
and parton distribution functions. Overall, our model provides a reasonable
description of the heavy quarkonia.Comment: 28 pages, 17 figures, 5 tables. Supplemental Materials are provided
in the source file under "Other formats" (see also "Ancillary files"