Cross section measurement and spin-parity analysis of the reaction γγ → ωϱ

H. J. Behrend, L. Criegee, J. H. Field, G. Franke, H. Jung, J. Meyer, O. Podobrin, V. Schröder, G. G. Winter, P. J. Bussey, A. J. Campbell, D. Hendry, S. Lumsdon, I. O. Skillicorn, J. Ahme, V. Blobel, M. Feindt, H. Fenner, J. Harjes, J. H. KöhneJ. H. Peters, H. Spitzer, T. Weihrich, W. D. Apel, J. Engler, G. Flügge, D. C. Fries, J. Fuster, K. Gamerdinger, P. Grosse-Weismann, H. Küster, H. Müller, K. H. Ranitzsch, H. Schneider, W. de Boer, G. Buschhorn, G. Grindhammer, B. Gunderson, Ch Kiesling, R. Kotthaus, H. Kroha, D. Lüers, H. Oberlack, P. Schacht, S. Scholz, W. Wiedenmann, M. Davier, J. F. Grivaz, J. Haissinski, V. Journé, F. Le Diberder, J. J. Veillet, K. Blohm, R. George, M. Goldberg, O. Hamon, F. Kapusta, L. Poggioli, M. Rivoal, G. d'Agostini, F. Ferrarotto, M. Iacovacci, G. Shooshtari, B. Stella, G. Cozzika, Y. Ducros, G. Alexander, A. Beck, G. Bella, J. Grunhaus, A. Klatchko, A. Levy, C. Milsténe

Research output: Contribution to journalArticlepeer-review


We present results of an analysis of the reaction γγ→ωρ{variant} in the two-photon process e+e-→ε{lunate}+e- +-π0 in the untagged mode. The cross section is largely compatible with previous determinations; however, we do not confirm the enhancement claimed at 1.9 GeV. All observed ω's are accompanied by ρ{variant}'s in the recoiling ππ spectrum. An angular correlation analysis shows that the data is not dominated by a single spin-parity state, thus establishing severe constraints on qqqq models which predict JP = 2+.

Original languageEnglish
Pages (from-to)505-513
Number of pages9
JournalPhysics Letters B
Issue number3-4
StatePublished - 28 Mar 1991


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