A QCD factorization and resummation formula for the threshold logarithms in double-deeply virtual Compton scattering is derived, and its two-loop leading-power coefficient function agrees with an independent explicit calculation.
The perturbative limit of the two-pion distribution amplitude
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abstract
We consider pion pair production in two-photon collisions, gamma* gamma -> pi+ pi-, at large photon virtuality Q^2 and center-of-mass energy \sqrt{s} in the hard-scattering picture. In the limit where s is large but s << Q^2 we derive an expression for the two-pion light-cone distribution in terms of the conventional pion distribution amplitudes. Our result reproduces the well-known scaling behavior, helicity selection rule and symmetry relations in this regime.
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Threshold resummation for double-deeply virtual Compton scattering
A QCD factorization and resummation formula for the threshold logarithms in double-deeply virtual Compton scattering is derived, and its two-loop leading-power coefficient function agrees with an independent explicit calculation.