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We present the results of a lattice study of the second moment of thelight-cone pion distribution amplitude using two flavors of dynamical (clover)fermions on lattices of different volumes and pion masses down to $m_\pi\sim150 \, \mathrm {MeV}$. At lattice spacings between $0.06 \, \mathrm {fm}$ and$0.08 \, \mathrm {fm}$ we find for the second Gegenbauer moment the value $a_2= 0.1364(154)(145)$ at the scale $\mu=2 \, \mathrm {GeV}$ in the$\overline{\mathrm{MS}}$ scheme, where the first error is statistical includingthe uncertainty of the chiral extrapolation, and the second error is theestimated uncertainty coming from the nonperturbatively determinedrenormalization factors.

Second Moment of the Pion Light-cone Distribution Amplitude from Lattice QCD