BESIII reports improved branching fractions for χ_c0, χ_c1, and χ_c2 to four pions of (3.10, 1.16, 1.92) × 10^{-2} respectively, with ρ⁺ρ⁻ as the dominant intermediate state.
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Measurement of the branching fractions of $\chi_{cJ} \to \pi^{+}\pi^{-}\pi^{0}\pi^{0}$ via $\psi(3686) \to \gamma\chi_{cJ}$
BESIII reports improved branching fractions for χ_c0, χ_c1, and χ_c2 to four pions of (3.10, 1.16, 1.92) × 10^{-2} respectively, with ρ⁺ρ⁻ as the dominant intermediate state.