Renormalon-chain contributions to two-point correlators of nonlocal quark currents and light-meson distribution amplitudes

Abstract

In the framework of QCD sum rules, we study the endpoint slopes of the leading-twist distribution amplitudes in the large-$\beta_0$ approximation for the pion and the longitudinally polarized $\rho$ meson. To this end, we compute the two-point massless correlator of non-local composite vector quark currents with the gluon lines dressed by chains of one-loop fermion bubbles. This correlator depends on the Bjorken fraction $x$ associated with the composite current and, within the large-$\beta_0$ approximation, provides the dominant contribution in each order of perturbation theory. We derive an inequality for the second Gegenbauer moments of these distribution amplitudes that agrees with predictions from lattice QCD.