%0 Journal Article
%T Single spin asymmetries in $¦Ã^* ¦Ã\to ¦Ð¦Ð¦Ð$ at large Q^2
%A B. Pire
%A O. V. Teryaev
%J Physics
%D 2000
%I arXiv
%R 10.1016/S0370-2693(00)01279-X
%X The $\gamma^* \gamma \to \pi \pi \pi$ reaction is analysed in QCD at large photon virtuality Q and small hadronic mass W. Its amplitude factorizes in a $3 \pi$ generalized distribution amplitude and a hard subprocess $\gamma^* \gamma \to q \bar q$ or $\gamma^* \gamma \to g g$. The interference of this process with a Brehmsstrahlung process in e e or $e \gamma$ collisions gives rise to interesting single spin asymmetries, particularly when W is near the $\omega$ mass.
%U http://arxiv.org/abs/hep-ph/0007014v1