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We study the processes γγ → ηc → η'K+K, η'π+π, and ηπ+π using a data sample of 519 fb−1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e collider at center-of-mass energies at and near the ϒ(nS) (n = 2, 3, 4) resonances. This is the first observation of the decay ηc → η'K+K and we measure the branching fraction Γ(ηc → η' K+K)=(Γ(ηcη'π+π) = 0.644 ± 0.039stat 0.032sys. Significant interference is observed between γγ → ηc → ηπ+π and the nonresonant two-photon process γγ → ηπ+π. A Dalitz plot analysis is performed of ηc decays to η'K+K,η'π+π, and ηπ+π. Combined with our previous analysis of ηc KK̅ π, we measure the K * 0 (1430) parameters and the ratio between its η' K and πK couplings. The decay ηc → η' π+π is dominated by the f0(2100) resonance, also observed in J=ψ radiative decays. A new a0(1700) → ηπ resonance is observed in the ηcηπ+π- channel. We also compare ηc decays to η and η' final states in association with scalar mesons as they relate to the identification of the scalar glueball.

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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

APA Citation

Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., … Wu, S. L. (2021). Light meson spectroscopy from Dalitz plot analyses of . Physical Review D, 104(7).

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