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Measurement of the [formula omitted],η, [formula omitted]Transition Form Factors at BABAR

Authors
Journal
Nuclear Physics B - Proceedings Supplements
0920-5632
Publisher
Elsevier
Volume
234
Identifiers
DOI: 10.1016/j.nuclphysbps.2012.12.032
Keywords
  • Two-Photon Physics
  • Transition Form Factor
  • Pseudoscalar Meson
Disciplines
  • Physics

Abstract

Abstract Measurements of the transition form factors of the pseudoscalar mesons π0, η, η′ have been carried out by the BABAR collaboration at the SLAC B-factory PEP-II. The form factors F(Q2) were measured in two-photon processes covering the kinematic range 4 GeV2<Q2<40 GeV2. For the π0 form factor, results are significantly higher than predicted by Brodsky and Lepage assuming an asymptotic distribution amplitude. Data also suggest that the asymptotic regime of QCD is reached only at relatively high Q2. We also report on measurements of the η and η′ transition form factors, which happen to feature a significantly different Q2 behaviour than the one of the neutral pion.

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