Evidence of the e⁺ e^-→ f₁(1285) reaction with the CMD-3 detector at VEPP-2000

@misc{solodov2026evidence,
  title = {{Evidence of the $e^+ e^-\to f_1(1285)$ reaction with the CMD-3 detector at VEPP-2000}},
  author = {E. P. Solodov and R. R. Akhmetshin and A. N. Amirkhanov and A. V. Anisenkov and V. M. Aulchenko and N. S. Bashtovoy and E. V. Bedarev and D. E. Berkaev and A. E. Bondar and A. V. Bragin and D. E. Chistyakov and V. S. Denisov and E. A. Eminov and D. A. Epifanov and L. B. Epshteyn and A. L. Erofeev and G. V. Fedotovich and L. B. Fomin and A. O. Gorkovenko and A. A. Grebenuk and S. S. Gribanov and D. N. Grigoriev and F. V. Ignatov and V. L. Ivanov and A. S. Kasaev and S. V. Karpov and V. F. Kazanin and I. A. Koop and A. A. Korobov and A. N. Kozyrev and P. P. Krokovny and A. S. Kuzmin and T. A. Kuznetsov and I. B. Logashenko and P. A. Lukin and K. Yu. Mikhailov and I. V. Obraztsov and V. G. Petrochenko and N. A. Petrov and A. S. Popov and S. A. Rastigeev and Yu. A. Rogovsky and A. A. Ruban and A. E. Ryzhenenkov and A. V. Semenov and V. E. Shebalin and D. N. Shemyakin and B. A. Shwartz and D. B. Shwartz and M. V. Timoshenko and V. M. Titov and A. A. Talyshev and S. S. Tolmachev and A. I. Vorobiov and D. S. Zhadan and Yu. V. Yudin},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2608.03417},
  eprint = {2608.03417},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.03417},
  note = {CC0},
}

TY  - UNPB
TI  - Evidence of the e^+ e^-→ f_1(1285) reaction with the CMD-3 detector at VEPP-2000
AU  - E. P. Solodov
AU  - R. R. Akhmetshin
AU  - A. N. Amirkhanov
AU  - A. V. Anisenkov
AU  - V. M. Aulchenko
AU  - N. S. Bashtovoy
AU  - E. V. Bedarev
AU  - D. E. Berkaev
AU  - A. E. Bondar
AU  - A. V. Bragin
AU  - D. E. Chistyakov
AU  - V. S. Denisov
AU  - E. A. Eminov
AU  - D. A. Epifanov
AU  - L. B. Epshteyn
AU  - A. L. Erofeev
AU  - G. V. Fedotovich
AU  - L. B. Fomin
AU  - A. O. Gorkovenko
AU  - A. A. Grebenuk
AU  - S. S. Gribanov
AU  - D. N. Grigoriev
AU  - F. V. Ignatov
AU  - V. L. Ivanov
AU  - A. S. Kasaev
AU  - S. V. Karpov
AU  - V. F. Kazanin
AU  - I. A. Koop
AU  - A. A. Korobov
AU  - A. N. Kozyrev
AU  - P. P. Krokovny
AU  - A. S. Kuzmin
AU  - T. A. Kuznetsov
AU  - I. B. Logashenko
AU  - P. A. Lukin
AU  - K. Yu. Mikhailov
AU  - I. V. Obraztsov
AU  - V. G. Petrochenko
AU  - N. A. Petrov
AU  - A. S. Popov
AU  - S. A. Rastigeev
AU  - Yu. A. Rogovsky
AU  - A. A. Ruban
AU  - A. E. Ryzhenenkov
AU  - A. V. Semenov
AU  - V. E. Shebalin
AU  - D. N. Shemyakin
AU  - B. A. Shwartz
AU  - D. B. Shwartz
AU  - M. V. Timoshenko
AU  - V. M. Titov
AU  - A. A. Talyshev
AU  - S. S. Tolmachev
AU  - A. I. Vorobiov
AU  - D. S. Zhadan
AU  - Yu. V. Yudin
PY  - 2026
DA  - 2026/10/31
PB  - arXiv
DO  - 10.48550/arxiv.2608.03417
UR  - https://arxiv.org/abs/2608.03417
AB  - A search for the e^+ e^-→ f_1(1285) reaction is performed with the CMD-3 detector at the VEPP-2000 collider. Data from a scan in the center-of-mass energy range Ec.m.=1.20--1.36 GeV with 109.1 pb^−1 of the integrated luminosity is used. A dedicated 51.7 pb^−1 have been collected at the f_1(1285) resonance peak energy Ec.m.=1282 MeV, where 26.5 ± 7.4 events have been found in the e^+ e^-→ηπ^0π^0 reaction. No indication of the signal is observed in the scan data. We interpret the result as a statistical 4.5σ evidence of the C-even resonance production in the e^+ e^-→ f_1(1285)→ηπ^0π^0 reaction via the two-photon interaction. The production cross section is found to be σ(e^+ e^-→ f_1) = 0.074 ± 0.021 ± 0.010 nb, and the corresponding branching fraction to the e^+ e^- pair is B(f_1(1285)→ e^+e^-) = (8.3 ± 2.3 ± 1.1)× 10^−9.
ER  -