Measurements of the Meson-Photon Transition Form Factors of Light Pseudoscalar Mesons at Large Momentum Transfer

Abstract

Using the CLEO~II detector, we have measured the differential cross sections for exclusive two-photon production of light pseudoscalar mesons ${\pi }^0$, $\eta$, and ${\eta }^{\prime }$. From our measurements we have obtained the form factors associated with the electromagnetic transitions ${\gamma }^{\ast }\gamma$ $\to$ meson. We have measured these form factors in the momentum transfer ranges from 1.5 to 9, 20, and 30 GeV${}^2$ for ${\pi }^0$, $\eta$, and ${\eta }^{\prime }$, respectively, and have made comparisons to various theoretical predictions.

30 page postscript file, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

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• Use and Misuse of QCD Sum Rules in Heavy-to-light Transitions: the Decay $B\to \rho e\nu$ Reexamined
• Transverse Momentum and Sudakov Effects in Exclusive QCD Processes: gamma* gamma pi0 Form Factor

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