Search for rare radiative decays ofΦ-meson at VEPP-2M

  • V. P. Druzhinin
  • M. S. Dubrovin
  • S. I. Eidelman
  • V. B. Golubev
  • V. N. Ivanchenko
  • G. Ya. Kezerashvili
  • I. A. Koop
  • E. V. Pakhtusova
  • A. N. Peryshkin
  • S. I. Serednyakov
  • Yu. M. Shatunov
  • V. A. Sidorov
Article

Abstract

Results of the search for rare radiative decay modes of the ϕ-meson performed with the Neutral Detector at the VEPP-2M collider are presented. For the first time upper limits for the branching ratios of the following decay modes have been placed at 90% confidence level:
$$\begin{gathered} B(\phi \to \eta '\gamma )< 4 \cdot 10^{ - 4} , \hfill \\ B(\phi \to \pi ^0 \pi ^0 \gamma )< 10^{ - 3} , \hfill \\ B(\phi \to f_0 (975)\gamma )< 2 \cdot 10^{ - 3} , \hfill \\ B(\phi \to H\gamma )< 3 \cdot 10^{ - 4} , \hfill \\ \end{gathered} $$
whereH is a scalar (Higgs) boson with a mass 600 MeV<mH<1000 MeV, the real measurement isB(φHγB(H→2π0)<0.8·10-4, the quoted result is model dependent, as explained in the text,
$$\begin{gathered} B(\phi \to a\gamma ) \cdot B(a \to e^ + e^ - )< 5 \cdot 10^{ - 5} , \hfill \\ B(\phi \to a\gamma ) \cdot B(a \to \gamma \gamma )< 2 \cdot 10^{ - 3} , \hfill \\ \end{gathered} $$
wherea is a particle with a low mass and a short lifetime,
$$B(\phi \to a\gamma )< 0.7 \cdot 10^{ - 5} ,$$
wherea is a particle with a low mass not observed in the detector.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    V.B. Golubev et al.: Nucl. Instrum. Methods 227 (1984) 467Google Scholar
  2. 2.
    V.P. Druzhinin et al.: Phys. Lett. 144B (1984) 136Google Scholar
  3. 3.
    V.B. Golubev et al. Yad. Fiz. 41 (1985) 1176Google Scholar
  4. 4.
    V.B. Golubev et al.: Yad. Fiz. 44 (1986) 633Google Scholar
  5. 5.
    P.J. O'Donnell: Rev. Mod. Phys. 53 (1981) 673; Ya.I. Azimov: LINP preprint, LINP 819, Leningrad, 1982Google Scholar
  6. 6.
    V.M. Aulchenko et al.: INP preprint, INP 86-105Google Scholar
  7. 7.
    J.L. Rosner: Phys. Rev. D 27 (1983) 1101; H. Kolanoski: Proc. of the 1985 International Symposium on Lepton and Photon Interaction at High Energies, Kyoto (1986) 109; J.L. Rosner: ibid, Proc. of the 1985 International Symposium on Lepton and Photon Interaction at High Energies, Kyoto (1986)448; Sh.S. Eremyan, A.E. Nazaryan: Yad. Fiz. 42 (1986) 1303Google Scholar
  8. 8.
    S.I. Dolinsky et al.: Phys. Lett. 174B (1986) 453Google Scholar
  9. 9.
    Review of Particle Properties: Particle Data Group, 1986Google Scholar
  10. 10.
    V.A. Karnakov: Yad. Fiz. 42 (1985) 1001Google Scholar
  11. 11.
    J. Yellin: Phys. Rev. 147 (1966) 1080; S.M. Renard: Nuovo Cimento 62A (1969) 475Google Scholar
  12. 12.
    N.N. Achasov et al.: Usp. Fiz. Nauk. 142 (1984) 361Google Scholar
  13. 13.
    T. Barnes et al.: Phys. Lett. 183B (1987) 207Google Scholar
  14. 14.
    A.I. Vainshtein et al.: Usp. Fiz. Nauk. 131 (1980) 537Google Scholar
  15. 15.
    A.A. Anselm et al.: Usp. Fiz. Nauk. 145 (1985) 185Google Scholar
  16. 16.
    H. Wilczek: Phys. Rev. Lett. 39 (1977) 1304; S.N. Biswas: Phys. Rev. D 32 (1985) 1844Google Scholar
  17. 17.
    C. Edwards et al.: Phys. Rev. Lett. 48 (1982) 903Google Scholar
  18. 18.
    S. Youssef et al.: Phys. Lett. 139B (1984) 332; H. Albrecht et al.: Z. Phys. C — Particles and Fields 29 (1985) 167; D. Besson et al.: Phys. Rev. D 33 (1986) 360Google Scholar
  19. 19.
    M.B. Voloshin: Yad. Fiz. 44 (1986) 738; ibid M.B. Voloshin: Yad. Fiz., 45 (1987) 190Google Scholar
  20. 20.
    B.A. Bardeen et al.: Phys. Lett. 76B (1978) 580; A.A. Anselm, N.G. Uraltsev: Proceedings of the School of LINP, Leningrad (1985) 3Google Scholar
  21. 21.
    P. Fayet, M. Mszard: Phys. Lett. 104B (1981) 226Google Scholar
  22. 22.
    L.B. Okun: ITEF preprint, ITEF-149 (1983)Google Scholar
  23. 23.
    T. Mageras et al.: Phys. Rev. Lett. 56 (1986) 2672; T. Bowcock et al.: Phys. Rev. Lett. 56 (1986) 2676Google Scholar

Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • V. P. Druzhinin
    • 1
  • M. S. Dubrovin
    • 1
  • S. I. Eidelman
    • 1
  • V. B. Golubev
    • 1
  • V. N. Ivanchenko
    • 1
  • G. Ya. Kezerashvili
    • 1
  • I. A. Koop
    • 1
  • E. V. Pakhtusova
    • 1
  • A. N. Peryshkin
    • 1
  • S. I. Serednyakov
    • 1
  • Yu. M. Shatunov
    • 1
  • V. A. Sidorov
    • 1
  1. 1.Institute of Nuclear PhysicsNovosibirskUSSR

Personalised recommendations