Based on (2712.4+-14.3) × 10^6 ψ(3686) events, we investigate four hadronic decay modes of the P-wave charmonium spin-singlet state h_c(1P1) → h+h-π0/η (h = π or K) via the process ψ(3686) → π0h_c at BESIII. The h_c → π+π-π0 decay is observed with a significance of 9.6σ after taking into account systematic uncertainties. Evidences for h_c → K+K-π0 and h_c → K+K-η are found with significances of 3.5σ and 3.3σ, respectively, after considering the systematic uncertainties. The branching fractions of these decays are measured to be B(h_c -> π+π-π0) = (1.36+-0.16+-0.14)×10^-3, B(h_c →K+K-π0) = (3.26+-0.84+-0.36)×10^-4, and B(h_c → K+K-η) = (3.13+-1.08+-0.38) × 10^-4, where the first uncertainties are statistical and the second are systematic. No significant signal of h_c → π+π-η is found, and the upper limit of its decay branching fraction is determined to be B(h_c → π+π-η) < 4.0 × 10^-4 at the 90% confidence level.
Measurements of the branching fractions of the P-wave charmonium spin-singlet state hc (1P1) →h+h-π0/η
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2024-01-01
Abstract
Based on (2712.4+-14.3) × 10^6 ψ(3686) events, we investigate four hadronic decay modes of the P-wave charmonium spin-singlet state h_c(1P1) → h+h-π0/η (h = π or K) via the process ψ(3686) → π0h_c at BESIII. The h_c → π+π-π0 decay is observed with a significance of 9.6σ after taking into account systematic uncertainties. Evidences for h_c → K+K-π0 and h_c → K+K-η are found with significances of 3.5σ and 3.3σ, respectively, after considering the systematic uncertainties. The branching fractions of these decays are measured to be B(h_c -> π+π-π0) = (1.36+-0.16+-0.14)×10^-3, B(h_c →K+K-π0) = (3.26+-0.84+-0.36)×10^-4, and B(h_c → K+K-η) = (3.13+-1.08+-0.38) × 10^-4, where the first uncertainties are statistical and the second are systematic. No significant signal of h_c → π+π-η is found, and the upper limit of its decay branching fraction is determined to be B(h_c → π+π-η) < 4.0 × 10^-4 at the 90% confidence level.| File | Dimensione | Formato | |
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PhysRevD.110.032023.pdf
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