Abstract
Decays of the light mesons π0, η, ω, and η’ provide a unique laboratory to test fundamental aspects of hadron physics. Precision studies of such diverse topics as the light quark mass ratio, π−π scattering lengths, and searches for physics beyond the Standard Model are possible. Additionally, Dalitz decays of light mesons provide a way of measuring the electromagnetic meson transition formfactors in the time-like region. The A2 tagged photon facility at the Mainz Microtron provides a high yield of light mesons produced by photo-induced reactions on protons, which makes the experiment ideal for high precision measurements of meson decays. Presented here are the contributions made by the A2 collaboration to such studies.
Highlights
Studies of the interactions and properties of light mesons, π0, η, ω, and η′, provide insight to fundamental aspects of hadron physics
The largest contribution to the error comes from the strong sector, where data-driven approaches need input from experimental measurements of, among others, transition form factors (TFFs) of pseudoscalar mesons [5]
The A2 collaboration has published a high statistics result on the singly-virtual π0 TFF based on the measurement of the π0 Dalitz decay [18]
Summary
Studies of the interactions and properties of light mesons, π0, η, ω, and η′, provide insight to fundamental aspects of hadron physics They probe low-energy, and non-perturbative, QCD where models and effective field theories are used. These often require experimental measurements as input or for benchmarking. This text will discuss some of the important decay studies performed at the A2 experiment and the role they play in our understanding of low-energy QCD. Meson transition form factors (TFFs) describe the interaction between mesons and two real or virtual photons They provide a unique tool to study the electromagnetic structure of the mesons. The largest contribution to the error comes from the strong sector, where data-driven approaches need input from experimental measurements of, among others, TFFs of pseudoscalar mesons [5]
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