A measurement of the π0, η and η′ electromagnetic form factors

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. J. 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-Wiesmann, H. Küster, H. Müller, K. H. Ranitzsch, H. Schneider, W. de Boer, G. Buschhorn, G. Grindhammer, B. Gunderson, C. 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We present measurement of the π0γ*γ, ηγ*γ and η′γ*γ form factors. The π0-form factor is for the first time observed in the space-like region. The transition form factor of the η-meson is determined from its decay modes π+π-π0, π+π-γ and the neutral decay mode γγ. The decay of the η′ is observed in the decay channels ργ, ηπ+π- with η→γγ and in the four charged prong final state stemming from ηπ+π- with the η decaying into π+π-0/γ). All form factors agree well with a simple ρ-pole predicted by the vector meson dominance model and also with the QCD inspired Brodsky-Lepage model.

Original languageEnglish
Pages (from-to)401-409
Number of pages9
JournalEuropean Physical Journal C
Issue number3
StatePublished - Sep 1991


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