Improved branching fractions for η' → π⁺π⁻π⁺π⁻ ((8.56±0.34)×10^{-5}) and η' → π⁺π⁻π⁰π⁰ ((2.12±0.16)×10^{-4}), upper limit <1.24×10^{-5} on η' → 4π⁰, and first extraction of α=1.22±0.37 from amplitude analysis.
If more than one candidate combination is found, that one with the smallest χ2 8C is retained
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Improved measurement of the decays $\eta' \to \pi^{+}\pi^{-}\pi^{+(0)}\pi^{-(0)}$ and search for the rare decay $\eta' \to 4\pi^{0}$
Improved branching fractions for η' → π⁺π⁻π⁺π⁻ ((8.56±0.34)×10^{-5}) and η' → π⁺π⁻π⁰π⁰ ((2.12±0.16)×10^{-4}), upper limit <1.24×10^{-5} on η' → 4π⁰, and first extraction of α=1.22±0.37 from amplitude analysis.