Inclusive production of η′ (958) and fo (975) mesons in the υ energy region

H. Albrecht, H. Ehrlichmann, T. Hamacher, R. P. Hofmann, T. Kirchhoff, A. Nau, S. Nowack, H. Schröder, H. D. Schulz, M. Walter, R. Wurth, R. D. Appuhn, C. Hast, H. Kolanoski, A. Kosche, A. Lange, A. Lindner, R. Mankel, M. Schieber, T. SiegmundB. Spaan, H. Thurn, D. Töpfer, A. Walther, D. Wegener, A. Zimmermann, M. Bittner, P. Eckstein, M. Paulini, K. Reim, H. Wegener, R. Mundt, T. Oest, R. Reiner, W. Schmidt-Parzefall, W. Funk, J. Stiewe, S. Werner, K. Ehret, W. Hofmann, A. Hüpper, S. Khan, K. T. Knöpfle, M. Seeger, J. Spengler, D. I. Britton, C. E.K. Charlesworth, K. W. Edwards, E. R.F. Hyatt, H. Kapitza, P. Krieger, D. B. MacFarlane, P. M. Patel, J. D. Prentice, P. R.B. Saull, K. Tzamariudaki, R. G. Van de Water, T. S. Yoon, D. Reßing, M. Schmidtler, M. Schneider, K. R. Schubert, K. Strahl, R. Waldi, S. Weseler, G. Kernel, P. Križan, E. Križnič, T. Podobnik, T. Živko, V. Balagura, I. Belyaev, S. Chechelnitsky, M. Danilov, A. Droutskoy, Yu Gershtein, A. Golutvin, I. Gorelov, G. Kostina, V. Lubimov, P. Pakhlov, F. Ratnikov, S. Semenov, V. Shibaev, V. Soloshenko, I. Tichomirov, Yu Zaitsev

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12 Scopus citations


The inclusive production cross sections of η′ (958) and fo (975) mesons are measured in e+e- annihilation in the nonresonant continuum around {Mathematical expression} GeV and in decays of the υ resonances using the ARGUS detector. For η′ (958) mesons, a production ratio of η′ (958)/ηdir=0.35±0.24, with ηdir=η-BR(η′→ηX)·η′, is determined in direct υ(1 S) decays, which can be partially explained by the pseudoscalar singlet/octet mixing. For fo(975) production, we obtain a production ratio of fo(975)/p(770)°=0.17±0.030 in direct υ(1 S) decays. In its production features, the fo(975) behaves like an ordinary meson, though a K {Mathematical expression} molecule nature cannot be excluded. The substantial production yield of the fo(975) meson demonstrates the important effect of feeddown from mesons beyond the basic multiples on pseudoscalar and vector meson production.

Original languageEnglish
Pages (from-to)199-206
Number of pages8
JournalZeitschrift für Physik C Particles and Fields
Issue number2
StatePublished - Jun 1993
Externally publishedYes


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