Observation of η c ( 1 S , 2 S ) and χ c J decays to 2 ( π + π − ) η via ψ ( 3686 ) radiative transitions

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bloms, J.; Bortone, A.; Boyko, I.; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, T. T.; Chang, W. L.; Che, G. R.; Chelkov, G.; Chen, C.; Chen, Chao; Chen, G.; Chen, H. S.; Chen, M. L.; Chen, S. J.; Chen, S. M.; Chen, T.; Chen, X. R.; Chen, X. T.; Chen, Y. B.; Chen, Y. Q.; Chen, Z. J.; Cheng, W. S.; Choi, S. K.; Chu, X.; Cibinetto, G.; Coen, S. C.; Cossio, F.; Cui, J. J.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; de Boer, R. E.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, B.; Ding, X. X.; Ding, Y.; Ding, Y.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, S. X.; Duan, Z. H.; Egorov, P.; Fan, Y. L.; Fang, J.; Fang, S. S.; Fang, W. 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doi:10.1103/PhysRevD.111.052013

Observation of $η_{c} (1 S, 2 S)$ and $χ_{c J}$ decays to $2 (π^{+} π^{-}) η$ via $ψ (3686)$ radiative transitions

Journal Article · Mon Mar 31 00:00:00 EDT 2025 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.111.052013· OSTI ID:2543182

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bloms, J. more »

Based on $(2712.4 \pm 14.1) \times 10^{6}$ $ψ (3686)$ decays collected with the BESIII detector, we have observed, for the first time, the hadronic decays of S- and P-wave charmonium states into $2 (π^{+} π^{-}) η$ via radiative transitions from $ψ (3686)$ . The branching fraction of the decay $η_{c} (1 S) \to 2 (π^{+} π^{-}) η$ has a significant dependence on the interference pattern between $η_{c} (1 S)$ and non- $η_{c} (1 S)$ processes. We measure it in both the destructive and constructive interference scenarios for the first time. The mass and width of the $η_{c} (1 S)$ are measured to be $M = (2984.14 \pm 0.13 \pm 0.38) MeV / c^{2}$ and $Γ = (28.82 \pm 0.11 \pm 0.82) MeV$ , respectively. Clear signals for the decays of the $χ_{c J} (J = 0, 1, 2)$ and the $η_{c} (2 S)$ to $2 (π^{+} π^{-}) η$ are also observed for the first time, and the corresponding branching fractions are measured. The ratio of the branching fractions between the $η_{c} (2 S)$ and $η_{c} (1 S)$ decays is significantly lower than the theoretical prediction, which might suggest different dynamics in their decays.

Published by the American Physical Society 2025

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2543182

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 5 Vol. 111; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Observation of $η_{c} (1 S, 2 S)$ and $χ_{c J}$ decays to $2 (π^{+} π^{-}) η$ via $ψ (3686)$ radiative transitions