Single spin asymmetries in $γ^* γ\to πππ$ at large Q^2

Details Single spin asymmetries in $γ^* γ\to πππ$ at large Q^2 Single spin asymmetries in $γ^* γ\to πππ$ at large Q^2

2000-07-03

arxiv.org/abs/hep-ph/0007014v1

Phys.Lett. B496 (2000) 76-82

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 12 pages

Scientific paper

10.1016/S0370-2693(00)01279-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.

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