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First Two-Hadron Form Factor from QCD
We present the first QCD determination of an energy-dependent form factor for a two-hadron scattering state. In particular, we calculate the QCD contribution to the forward electromagnetic $π^+π^+ + γ\toπ^+π^+$ amplitude at $m_π\approx 400$~MeV using lattice QCD. Because lattice calculations are per
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