Two loop QCD corrections to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si12.svg"> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:mo>→</mm

Within the framework of NRQCD, the two-loop QCD corrections to the short-distance coefficient for the process e + e − → J / ψ + η c have been obtained in asymptotic expansion over r = 16 m c 2 / s up to r 15 , sufficient for phenomenological studies. The obtained leading logarithmic terms can facilitate the resummation of large logarithms. We provide cross section predictions in both on-shell and M S ‾ mass schemes, including μ R uncertainties. Both mass schemes give similar results, consistent with experimental data.