We report on the first lattice determination of the pseudoscalar meson
ηc light-cone distribution amplitude, using a set of three CLS Nf=2
ensembles at a pion mass mπ∼270MeV and lattice spacings a∼0.076fm, 0.066fm and 0.049fm. Employing Short
Distance Factorization, we extract the pseudo-DA on the lattice for Ioffe times
ν≤4.5, and the various lattice spacings allow us to take the continuum
limit. We employ a basis of Jacobi polynomials to parametrize the distribution
amplitude, which allows to express the matching to the pseudo distribution in
closed form, and we observe a strong effect which we attribute to the heavy
charm-quark mass.Comment: Contribution to the 40th International Symposium on Lattice Field
Theory (Lattice 2023), July 31st - August 4th, 2023. Fermi National
Accelerator Laborator