Aubert, B. et al. (2009) Measurement of the γγ*→π0 transition form factor. Physical Review D, 80 (5). 052002. ISSN 1550-7998
Abstract

We study the reaction e+e-→e+e-π0 in the single tag mode and measure the differential cross section dσ/dQ2 and the γγ*→π0 transition form factor in the momentum transfer range from 4 to 40  GeV2. At Q2>10  GeV2 the measured form factor exceeds the asymptotic limit predicted by perturbative QCD. The analysis is based on 442  fb-1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e- center-of-mass energies near 10.6 GeV.

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