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Study of Charmonium(-like) Spectroscopy and Decay at BESIII

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arxiv 2209.15061 v2 pith:RECWO5GJ submitted 2022-09-29 hep-ex hep-ph

Study of Charmonium(-like) Spectroscopy and Decay at BESIII

classification hep-ex hep-ph
keywords lambdaprocesscharmoniumdecayomegastatebesiiimeasurement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The recent results on Charmonium and Charmonium-like states at BESIII are reviewed, including the observation of $\rm Z_{cs}(3985)$ state, the study of the new decay modes of $\psi_2(3823)$ state, observation of resonance structure in $\rm e^+e^- \to \pi^+\pi^-\psi_2(3823)$ process, the study of the $\rm e^+e^- \to K^+K^-J/\psi$ process, cross section measurement of $\rm e^+e^- \to \omega\pi^0$ and $\omega\eta$ process, branching fraction measurement of $\psi(3686)\to\bar{\Sigma}^0\Lambda + c.c.$ process. Decay channels for $\chi_{cJ} \to \Lambda\bar{\Lambda}$, $\chi_{cJ} \to \Lambda\bar{\Lambda}\eta$, $\psi(3686) \to \Lambda\bar{\Lambda}\omega$ and $\eta_c(2S)\to3(\pi^+\pi^-)$ are also discussed. The property of the spin singlet P wave Charmonium state, $\rm h_c$ is also reported.

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  1. Measurement of the branching fractions of $\chi_{cJ} \to \pi^{+}\pi^{-}\pi^{0}\pi^{0}$ via $\psi(3686) \to \gamma\chi_{cJ}$

    hep-ex 2026-04 accept novelty 2.0

    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.