We highlight the progress, current status, and open challenges of QCD-driven physics, in
theory and in experiment. We discuss how the strong interaction is intimately connected to a …

Investigation at a φ-factory can shed light on several debated issues in particle physics. We
discuss:(i) recent theoretical development and experimental progress in kaon physics …

The γ p→ η p reaction has been measured with the Crystal Ball and TAPS multiphoton
spectrometers in the energy range from the production threshold of 707 MeV to 1.4 GeV (1 …

The dispersive analysis of the decay η → 3 π η→ 3 π is reviewed and thoroughly updated
with the aim of determining the quark mass ratio Q^ 2=(m_s^ 2-m_ ud^ 2)/(m_d^ 2-m_u^ 2) …

Coupled-channel dynamics for scattering and production processes in partial-wave
amplitudes is discussed from a perspective that emphasizes unitarity and analyticity. We …

The Dalitz decays η→ e+ e− γ and ω→ π 0 e+ e− have been measured in the γ p→ η p and
γ p→ ω p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron …

We present a unitary dispersive model for the η→ 3 π decay process based upon the Khuri-
Treiman equations which are solved by means of the Pasquier inversion method. The …

The isospin-breaking decay η→ 3π is an ideal tool to extract information on light quark mass
ratios from experiment. For a precise determination, however, a detailed description of the …

Recent experiments on η → 3 π η→ 3 π decays have provided an extremely precise
knowledge of the amplitudes across the Dalitz region which represent stringent constraints …

The η→ 3 π amplitude is sensitive to the quark mass difference mu-md and offers a unique
way to determine the quark mass ratio Q 2≡(ms 2-mud 2)/(md 2-mu 2) from experiment. We …