Abstract
Light meson decays are used to investigate topics related to fundamental aspects of particle physics. Precision measurements of meson Dalitz decays give input to theoretical evaluations of the Hadronic Light-by-Light contribution (HLbL) to the anomalous magnetic moment of the muon. The A2 collaboration, using the Crystal Ball/TAPS setup at MAMI, has recently published several high precision results on transition form factors which are related to HLbL. Pseudoscalar η’ decays allow for studies of topics like ππ scattering lengths, effective field theories and fundamental symmetries. In 2014 the collaboration had a dedicated experimental campaign with one of its main goals to measure the dynamics of η’→ π0π0η with high precision. A brief overview of the experimental setup, physics motivations, analyses and results are given.
Highlights
Mesons and their properties continue to be of interest to the hadron and particle-physics communities
This proceeding will focus on four recent results from the A2 collaboration: the Dalitz decays π0 → e+e−γ [1], η → e+e−γ, ω → π0e+e− [2], and the decay η → π0π0η [3]
The proceeding structure is as follows: after the introduction a description of the Crystal Ball-TAPS experimental setup at MAMI is given, followed by the three physics channels related to the transition form factors (TFF) and the η → π0π0η channel
Summary
Mesons and their properties continue to be of interest to the hadron and particle-physics communities. The η meson and its decay modes play an important role in our understanding of Quantum ChromoDynamics (QCD) and its related phenomenological models. This proceeding will focus on four recent results from the A2 collaboration: the Dalitz decays π0 → e+e−γ [1], η → e+e−γ, ω → π0e+e− [2], and the decay η → π0π0η [3]. The proceeding structure is as follows: after the introduction (section 1) a description of the Crystal Ball-TAPS experimental setup at MAMI is given (section 2), followed by the three physics channels related to the TFFs and the η → π0π0η channel (sections 3 and 4, respectively).
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