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Probing partonic structure in gamma* gamma -> pi pi near threshold
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Hadron pair production gamma* gamma -> h hbar in the region where the c.m. energy is much smaller than the photon virtuality can be described in a factorized form, as the convolution of a partonic handbag diagram and generalized distribution amplitudes which are new non-perturbative functions describing the exclusive fragmentation of a quark-antiquark pair into two hadrons. Scaling behavior and a selection rule on photon helicity are signatures of this mechanism. The case where h is a pion is emphasized.
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Cited by 1 Pith paper
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Revealing chiral-odd two-meson generalized distribution amplitudes in $e^- e^+ \to (\pi \pi) (\pi \pi)$ reactions
The paper proposes using two-photon exchange interference in e+e- to (pi pi)(pi pi) to access chiral-odd dimeson GDAs that encode spin-orbit correlations in spin-zero mesons.
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