QCD factorization in $\gamma*\gamma \to \pi\pi$ and $\gamma* N \to \pi\pi N$ - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Conference Papers Year : 1999

QCD factorization in $\gamma*\gamma \to \pi\pi$ and $\gamma* N \to \pi\pi N$

M. Diehl
  • Function : Author
Thierry Gousset
O. V. Terayev
  • Function : Author


Exclusive two-pion production near threshold in the collision of a highly virtual photon with a real one offers a new possibility to unravel the partonic content of hadrons. We explain the dynamics of this regime, i.e. the separation of the amplitude in terms of partonic diagrams computable in QCD perturbation theory and generalized distribution amplitudes, which are nonperturbative functions describing the exclusive transition of a parton pair into two hadrons. The same quantities also appear in gamma* N -> pi pi N in the kinematical regime where the momentum transfer of the nucleon and the invariant mass of the pion pair are both small; this allows to extend the QCD analysis of exclusive rho electroproduction outside the resonance region of the two produced pions.

Dates and versions

in2p3-00195516 , version 1 (11-12-2007)



M. Diehl, Thierry Gousset, B. Pire, O. V. Terayev. QCD factorization in $\gamma*\gamma \to \pi\pi$ and $\gamma* N \to \pi\pi N$. International Nuclear Physics Conference INPC 98, Aug 1998, Paris, France. pp.576c-579c, ⟨10.1016/S0375-9474(00)88503-6⟩. ⟨in2p3-00195516⟩
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