Study of e+e- →ηφ via initial state radiation at Belle

Belle Collaboration

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Using 980 fb-1 of data collected on and around the (nS) (n=1, 2, 3, 4, 5) resonances with the Belle detector at the KEKB collider, we measure the cross section of e+e-→ηφ from threshold to 3.95 GeV via initial state radiation. There are clear φ(1680) and J/ψ signals but no significant φ(2170) signal in the ηφ final state. The branching fraction B[J/ψ→ηφ] is measured to be (7.2±0.8±0.5)×10-4. The resonant parameters of φ(1680) are determined to be mφ(1680)=(1696±8±10) MeV/c2 (statistical and systematic errors, respectively), Γφ(1680)=(175±13±16) MeV and, depending on the possible presence of predominantly constructive or destructive interference between φ(1680) and continuum production, Γφ(1680)e+e-·B[φ(1680)→ηφ] and B[φ(1680)→ηφ] are determined to be (75±10±11) eV and (25±12±2)% or (207±16±20) eV and (23±10±2)%, respectively. The upper limit for Γφ(2170)e+e-·B[φ(2170)→ηφ] is determined to be either 0.17 or 18.6 eV at the 90% confidence level.

Original languageEnglish
Article number012006
JournalPhysical Review D
Issue number1
Publication statusPublished - 2023 Jan 1

Bibliographical note

Publisher Copyright:
© 2023 authors. Published by the American Physical Society. 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.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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