First measurement of the circular beam asymmetry in the γ→pπ0ηp reaction

V. L. Kashevarov, A. Fix, P. Aguar-Bartolomé, L. K. Akasoy, J. R M Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghäuser, A. Braghieri, D. Branford, W. J. Briscoe, J. Brudvik, S. Cherepnya, R. F B Codling, B. T. Demissie, E. J. Downie, P. Drexler, L. V. Fil'kovD. I. Glazier, R. Gregor, D. Hamilton, E. Heid, D. Hornidge, I. Jaegle, O. Jahn, T. C. Jude, J. D. Kellie, I. Keshelashvili, R. Kondratiev, M. Korolija, M. Kotulla, A. Koulbardis, S. Kruglov, B. Krusche, V. Lisin, K. Livingston, I. J D MacGregor, Y. Maghrbi, D. M. Manley, M. Martinez-Fabregate, J. C. McGeorge, E. F. McNicoll, D. Mekterovic, V. Metag, S. Micanovic, D. Middleton, A. Mushkarenkov, B. M K Nefkens, A. Nikolaev, R. Novotny, M. Ostrick, P. B. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, S. N. Prakhov, J. Robinson, G. Rosner, T. Rostomyan, S. Schumann, M. H. Sikora, D. Sober, A. Starostin, I. I. Stakovsky, I. M. Suarez, I. Supek, C. Tarbert, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller, I. Zamboni, F. Zehr

Research output: Contribution to journalArticle

24 Citations (Scopus)


The circular photon asymmetry for π0η photoproduction on the proton was measured for the first time at the tagged photon facility of the MAMI C accelerator using the Crystal Ball/TAPS photon spectrometer. The experimental results are interpreted within a phenomenological isobar model that confirms the dominant role of the Δ(1700)D33 resonance. The measured asymmetry allows us to identify small contributions from positive-parity resonances via interference terms with the dominant D33 amplitude.

Original languageEnglish
Pages (from-to)551-554
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number5
Publication statusPublished - 18 Oct 2010


  • Baryon resonances
  • Polarization observables
  • Pseudoscalar meson photoproduction

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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  • Cite this

    Kashevarov, V. L., Fix, A., Aguar-Bartolomé, P., Akasoy, L. K., Annand, J. R. M., Arends, H. J., Bantawa, K., Beck, R., Bekrenev, V., Berghäuser, H., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R. F. B., Demissie, B. T., Downie, E. J., Drexler, P., ... Zehr, F. (2010). First measurement of the circular beam asymmetry in the γ→pπ0ηp reaction. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 693(5), 551-554.