- Physical Review Journals
All JournalsPhysics Magazine

Physical Review D

Reuse & Permissions

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4.0 International license. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

Export citation

Export citation

Choose format for download:

Download Citation
  • Open Access

Measurement of the e+e−→ηγ cross section near the ϕ(1020) resonance with the SND detector

M. N. Achasov1,2, A. E. Alizzi1,2, A. Yu. Barnyakov1,2, E. V. Bedarev1,2, K. I. Beloborodov1,2, A. V. Berdyugin1,2, A. G. Bogdanchikov1, A. A. Botov1, D. E. Chistyakov1,2 et al.

T. V. Dimova1,2, V. P. Druzhinin1,2, L. V. Kardapoltsev1,2,*, A. S. Kasaev1, A. A. Kattsin1, A. G. Kharlamov1,2, I. A. Koop1,2, A. A. Korol1,2, D. P. Kovrizhin1, A. S. Kupich1,2, A. P. Kryukov1, N. A. Melnikova1, N. Yu. Muchnoi1,2, A. E. Obrazovsky1, A. A. Oorzhak1,2, E. V. Pakhtusova1, I. A. Polomoshnov1,2, K. V. Pugachev1,2, S. A. Rastigeev1, Yu. A. Rogovsky1,2, A. I. Senchenko1, S. I. Serednyakov1,2, Yu. M. Shatunov1, D. A. Shtol1, Z. K. Silagadze1,2, K. D. Sungurov1,2,†, I. K. Surin1, Yu. V. Usov1, V. N. Zhabin1,2, Yu. M. Zharinov1, and V. V. Zhulanov1,2

  • *Contact author: l.v.kardapoltsev@inp.nsk.su
  • †Contact author: k.d.sungurov@inp.nsk.su
PDF

Phys. Rev. D 113, 052003 – Published 6 March, 2026

DOI: https://doi.org/10.1103/r45q-js3w

Abstract

In the experiment with the SND at the VEPP-2000  e+e− collider, the e+e−→ηγ cross section is measured in the energy range E=980–1060  MeV. The measurement is carried out in the η→2γ decay mode. Data with an integrated luminosity of 73  pb−1 collected in 2018 and 2024 are used in the analysis. The measured cross section is the most accurate to date and is higher compared to other measurements. From the fit to the cross section data with the vector meson dominance model, the value of the product of the branching fractions B(ϕ→e+e−)B(ϕ→ηγ) has been obtained.

View figure in article

Physics Subject Headings (PhySH)

Article Text

Supplemental Material

References (30)

  1. P. O’Donnel, Rev. Mod. Phys. 53, 673 (1981).
  2. G. Morpurgo, Phys. Rev. D 42, 1497 (1990).
  3. M. Benayoun, L. Delbuono, and F. Jegerlehner, Eur. Phys. J. C 80, 81 (2020); 80, 244(E) (2020).
  4. R. Escribano and J. Nadal, J. High Energy Phys. 05 (2007) 006.
  5. F. Ambrosino et al. (KLOE Collaboration), J. High Energy Phys. 07 (2009) 105.
  6. R. Escribano and E. Royo, Phys. Lett. B 807, 135534 (2020).
  7. V. Mathieu, N. Kochelev, and V. Vento, Int. J. Mod. Phys. E 18, 1 (2009).
  8. I. E. Halperin and A. Zhitnitsky, Phys. Rev. D 56, 7247 (1997).
  9. M. N. Achasov et al. (SND Collaboration), Eur. Phys. J. C 12, 25 (2000).
  10. M. N. Achasov et al. (SND Collaboration), Phys. Rev. D 76, 077101 (2007).
  11. R. R. Akhmetshin et al. (CMD-2 Collaboration), Phys. Lett. B 460, 242 (1999).
  12. R. R. Akhmetshin et al. (CMD-2 Collaboration), Phys. Lett. B 509, 217 (2001).
  13. R. R. Akhmetshin et al. (CMD-2 Collaboration), Phys. Lett. B 605, 26 (2005).
  14. M. N. Achasov et al., Nucl. Instrum. Methods Phys. Res., Sect. A 449, 125 (2000).
  15. V. M. Aulchenko et al., Nucl. Instrum. Methods Phys. Res., Sect. A 598, 102 (2009).
  16. A. Y. Barnyakov et al., Nucl. Instrum. Methods Phys. Res., Sect. A 598, 163 (2009).
  17. V. M. Aulchenko et al., Nucl. Instrum. Methods Phys. Res., Sect. A 598, 340 (2009).
  18. P. Y. Shatunov et al., Phys. Part. Nucl. Lett. 13, 995 (2016).
  19. E. A. Kuraev and V. S. Fadin, Sov. J. Nucl. Phys. 41, 466 (1985).
  20. G. Bonneau and F. Martin, Nucl. Phys. B27, 381 (1971).
  21. J. Allison et al. (GEANT Collaboration), Nucl. Instrum. Methods Phys. Res., Sect. A 835, 186 (2016).
  22. E. V. Abakumova et al., Nucl. Instrum. Methods Phys. Res., Sect. A 744, 35 (2014).
  23. M. N. Achasov et al. (SND Collaboration), Phys. Rev. D 110, 072001 (2024).
  24. G. Balossini, C. Bignamini, C. M. Carloni Calame, G. Montagna, O. Nicrosini, and F. Piccinini, Phys. Lett. B 663, 209 (2008).
  25. S. Navas et al. (Particle Data Group), Phys. Rev. D 110, 030001 (2024).
  26. N. N. Achasov, M. S. Dubrovin, V. N. Ivanchenko, A. A. Kozhevnikov, and E. V. Pakhtusova, Int. J. Mod. Phys. A 07, 3187 (1992).
  27. J. J. Dudek et al. (Hadron Spectrum Collaboration), Phys. Rev. D 88, 094505 (2013).
  28. M. N. Achasov et al. (SND Collaboration), Phys. At. Nucl. 86, 1157 (2023).
  29. V. M. Malyshev, arXiv:1505.01509.
  30. See Supplemental Material at http://link.aps.org/supplemental/10.1103/r45q-js3w for the correlation matrix of the measured e+e−→ηγ cross section.

Outline

Information

Phys. Rev. D 113, 052003– Published 6 March, 2026
  • Received 21 October 2025
  • Accepted 19 February 2026
Crossmark - Check for updates button
Creative Commons Logo

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.

Published by the American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation