Investigation of the electromagnetic structure of ηand η′ mesons by two-photon interactions

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, B. A. Barnett, D. A. Bauer, A. Bay, G. J. Bobbink, C. D. Buchanan, A. Buijs, D. O. Caldwell, H. Y. Chao, S. B. Chun, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, M. Daoudi, K. A. DerbyJ. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, F. C. Erné, K. H. Fairfield, J. M. Hauptman, W. Hofmann, J. Hylen, T. Kamae, H. S. Kaye, R. W. Kenney, S. Khacheryan, R. R. Kofler, W. G J Langeveld, J. G. Layter, W. T. Lin, F. L. Linde, S. C. Loken, A. Lu, G. R. Lynch, R. J. Madaras, B. D. Magnuson, G. E. Masek, L. G. Mathis, J. A J Matthews, S. J. Maxfield, E. S. Miller, W. Moses, D. R. Nygren, P. J. Oddone, H. P. Paar, Sung Keun Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, B. C. Shen, J. R. Smith, J. S. Steinman, R. W. Stephens, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, S. Toutounchi, R. Van Tyen, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, W. A. Wenzel, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin

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Abstract

The TPC/Two-Gamma facility at the SLAC e+e- storage ring PEP was used to study the reactions γγ* → η and γγ* → η′. The ηγ*γ and η′γ*γ transition form factors were measured as functions of Q2, the negative of the invariant mass squared of the tagged photon, in the range 0.1 < Q2 < 7 GeV2. These determinations of the electromagnetic structure of the η and η′ mesons are consistent with both vector-meson dominance and QCD. They also provide new measurements of the pseudoscalar mixing angle and decay constants.

Original languageEnglish
Pages (from-to)172-175
Number of pages4
JournalPhysical Review Letters
Volume64
Issue number2
Publication statusPublished - 1990 Jan 8

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Aihara, H., Alston-Garnjost, M., Avery, R. E., Barbaro-Galtieri, A., Barker, A. R., Barnett, B. A., ... Zeitlin, C. (1990). Investigation of the electromagnetic structure of ηand η′ mesons by two-photon interactions. Physical Review Letters, 64(2), 172-175.