Partial wave analysis of πproduction in two-photon collisions at LEP

  • V. A. Schegelsky
  • A. V. SarantsevEmail author
  • A. V. Anisovich
  • M. P. Levchenko
Hadron Physics


The reaction γγ → π+π-π0 with quasi-real photons is studied with a total integrated luminosity of 663pb^-1, collected by the L3 detector at LEP at center-of-mass energies from 183 to 209GeV. The results of an energy-dependent partial wave analysis in the mass region 1.1≤M+π-π0)≤2.2GeV are presented. The reaction is dominated by a 2(1320) formation. A strong signal consistent with the first radial excitation of the isovector tensor state, a 2(1700), is present and confirms the previous L3 observation. Its two-photon partial width is found to be \( \Gamma_{{\gamma\gamma}}^{}\) Br(3π) = 0.37+0.12 -0.08keV, the relative branching ratio of ρ(770)π to f 2(1270)π is 3.4±0.4. For all observed states the product of γγ partial width and 3π branching ratios is measured.


11.80.Et Partial-wave analysis 13.60.Le Meson production 13.25.-k Hadronic decays of mesons 14.40.-n Mesons 


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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • V. A. Schegelsky
    • 1
  • A. V. Sarantsev
    • 1
    Email author
  • A. V. Anisovich
    • 1
  • M. P. Levchenko
    • 1
  1. 1.Petersburg Nuclear Physics InstituteGatchinaRussia

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