Light meson decays at BESIII
Beihang University, Beijing, 100083, People’s Republic of China
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Published online: 1 February 2019
The BESIII experiment has accumulated the world’s largest data samples of 1.3 billion J/ψ events and 0.45 billion ψ(3686) events, which provide a unique opportunity to investigate light meson decays. The η and η′ decays are sensitive tools for investigations of π − π and η − π interactions, symmetry breaking, and serve as a test of chiral perturbation theory. In recent years considerable results on η and η′ decays were achieved at the BESIII experiment. In this proceeding, we present the significant progresses on amplitude analyses of Dalitz decays η' → 3π,η' → ηππ, and radiative decay η' → γπ+π−, η' → γγπ0. Additionally, the mixing is an important probe to the nature of those two lightest scalar mesons. The first observation of mixing is also presented, which will help to improve the understanding of the nature of and f0(980).
© The Authors, published by EDP Sciences, 2019
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