Light Meson Spectroscopy from Dalit Plot Analyses of ηc Decays to η'K⁺K⁻ ,η'π⁺ π⁻ , and η π ⁺ π ⁻ Produced in Two-Photon Interactions

Author(s)

J. P. Lees
V. Poireau
V. Tisserand
E. Grauges
A. Palano
G. Eigen
D. N. Brown
Yu. G. Kolomensky
M. Fritsch
H. Koch
T. Schroeder
R. Cheaib
C. Hearty
T. S. Mattison
J. A. McKenna
R. Y. So
V. E. Blinov
A. R. Buzykaev
V. P. Druzhinin
Milind Purohit, University of South CarolinaFollow
Et. Al.

Document Type

Article

Abstract

We study the processes γγ → η_c → 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 η_c → η'K⁺K⁻ and we measure the branching fraction Γ(η_c → η' K⁺K⁻)=(Γ(η_c → η'π⁺π⁻) = 0.644 ± 0.039_stat 0.032_sys. 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 η_c decays to η'K⁺K⁻,η'π⁺π⁻, and ηπ⁺π⁻. Combined with our previous analysis of η_c → KK̅ π, we measure the K ^* ₀ (1430) parameters and the ratio between its η' K and πK couplings. The decay η_c → 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 η_c → ηπ⁺π^- channel. We also compare η_c decays to η and η' final states in association with scalar mesons as they relate to the identification of the scalar glueball.

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevD.104.072002

Publication Info

Published in Physical Review D, Volume 104, Issue 7, 2021.

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.

Rights

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). https://doi.org/10.1103/physrevd.104.072002