Download or read book Exclusive Production of Pion Pairs In[gamma]*[gamma] Collisions at Large Q[sup 2]. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors 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][r[underscore]arrow] q[anti q] or[gamma]*[gamma][r[underscore]arrow] gg, and a generalized two-meson distribution amplitude. The authors develop in detail the phenomenology of this process at e[sup+]e[sup[minus]] colliders. Using a simple model for the two-pion distribution amplitude, based on its general properties, the authors estimate the cross section for the kinematics accessible at BABAR, BELLE, CLEO and LEP.