Exclusive production of pion pairs in gamma^* gamma collisions at large Q^2

Details Exclusive production of pion pairs in gamma^* gamma collisions at large Q^2 Exclusive production of pion pairs in gamma^* gamma collisions at large Q^2

2000-03-23

arxiv.org/abs/hep-ph/0003233v2

Phys.Rev.D62:073014,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version to be published in Phys Rev D

Scientific paper

10.1103/PhysRevD.62.073014

We perform a QCD analysis of the exclusive production of two mesons in gamma^* gamma collisions in the kinematical domain of large photon virtuality Q and small hadronic invariant mass W. This reaction is dominated by a scale invariant mechanism which factorizes into a perturbative subprocess, gamma^* gamma --> q qbar or gamma^* gamma --> g g, and a generalized two-meson distribution amplitude. We develop in detail the phenomenology of this process at e^+ e^- colliders. Using a simple model for the two-pion distribution amplitude, based on its general properties, we estimate the cross section for the kinematics accessible at BABAR, BELLE, CLEO and LEP.

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