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Measurement of meson transition form factors at BESIII
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abstract
Meson transition form factors describe the coupling of photons and hadrons. They are an important input to the calculations of the light-by-light scattering contribution of the anomalous magnetic moment of the muon. At the BESIII experiment in Beijing, the transition form factors of pseudoscalar mesons are studied in their Dalitz decays, in their radiative production in $e^+e^-$ annihilation, and in their production in two-photon scattering. All relevant kinematic regimes are covered. An overview of the recent results and the status of the ongoing analyses is provided.
Forward citations
Cited by 2 Pith papers
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Form factors of light pseudoscalar mesons from the perturbative QCD approach
Adding intrinsic transverse momentum distributions to perturbative QCD improves form-factor predictions at low momentum transfer and gives beta_pi^2 = 0.51, beta_K^2 = 0.30 GeV^-2, m_0^pi = 1.84 GeV.
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Data-driven analysis of the $\gamma\gamma^*\rightarrow\pi^0$ system using mathematical models and the role of feedback-loop dynamics
A two-parameter fit model yields a half-saturation relation that is algebraically trivial, and a claimed improved Belle fit that is not quantitatively demonstrated.
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