A partial wave analysis of the reaction γγ → π+π-π0

H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, H. D. Schulz, M. Walter, R. Wurth, C. Hast, H. Kapitza, H. Kolanoski, A. Kosche, A. Lange, A. Lindner, M. Schieber, T. SiegmundH. Thurn, D. Töpfer, D. Wegener, C. Frankl, J. Graf, M. Schmidtler, M. Schramm, K. R. Schubert, R. Schwierz, B. Spaan, R. Waldi, K. Reim, H. Wegener, R. Eckmann, H. Kuipers, O. Mai, R. Mundt, T. Oest, R. Reiner, W. Schmidt-Parzefall, J. Stiewe, S. Werner, K. Ehret, W. Hofmann, A. Hüpper, K. T. Knöpfle, J. Spengler, P. Krieger, D. B. MacFarlane, J. D. Prentice, P. R.B. Saull, K. Tzamariudaki, R. G. Van De Water, T. S. Yoon, M. Schneider, S. Weseler, M. Bračko, G. Kernel, P. Križan, E. Križnič, G. Medin, T. Podobnik, T. Živko, V. Balagura, S. Barsuk, I. Belyaev, R. Chistov, M. Danilov, V. Eiges, L. Gershtein, Yu Gershtein, A. Golutvin, O. Igonkina, I. Korolko, G. Kostina, D. Litvintsev, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu Zaitsev

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18 Scopus citations


The two-photon reaction γγ → π+π-π0 was investigated by the ARGUS collaboration. The reaction is dominated by the formation of the a2(1320) meson. A value of Γγγ = (0.96 ± 0.03 ± 0.13) keV was obtained for its radiative width, in good agreement with the world average. The fraction of γγ-helicity 0 in the a2 two-photon width was found to be equal to (6.7 ± 2.2)%. It allows a discrimination among models that describe the dynamics in the two-photon production of tensor mesons. An upper limit of Γγγ·Br(ρ±π ) < 0.54 keV (90% c.l.) was obtained for the resonance π(1300). The partial wave analysis revealed almost a complete absence of the wave with spin and parity JP = 2-. We also observe no significant enhancement in the π+π-π0 invariant mass spectrum that could be attributed to the two-photon production of the π2(1670). The obtained upper limit Γγγ2(1670)) < 0.19 keV at the 90% confidence level is in contradiction with two previous observations.

Original languageEnglish
Pages (from-to)469-477
Number of pages9
JournalZeitschrift für Physik C Particles and Fields
Issue number3
StatePublished - 1997
Externally publishedYes


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