First measurement of the circular beam asymmetry in the γ→p→π0ηp reaction

Autor: M. Kotulla, M. H. Sikora, A. Koulbardis, E. J. Downie, I.I. Stakovsky, D. G. Middleton, P. Aguar-Bartolomé, D. Branford, Yasser Maghrbi, C. M. Tarbert, T. Rostomyan, M. Ostrick, A. Nikolaev, L. K. Akasoy, W. J. Briscoe, A. N. Mushkarenkov, B. M. K. Nefkens, D. Werthmüller, A. Braghieri, F. Zehr, M. Martinez-Fabregate, R. F. B. Codling, J. D. Kellie, D. Mekterovic, S. P. Kruglov, R. Beck, D. I. Glazier, I. Jaegle, R. Kondratiev, R. Gregor, I. Zamboni, B. Demissie, B. Oussena, D. P. Watts, I. M. Suarez, K. Bantawa, V. S. Bekrenev, I. Keshelashvili, D. I. Sober, V. Metag, J. Robinson, F. Pheron, M. Unverzagt, I. J. D. MacGregor, A. Starostin, S. Cherepnya, E. Heid, D. Hornidge, L. V. Fil'kov, A. Polonski, V. L. Kashevarov, H. Berghäuser, K. Livingston, T. C. Jude, P. Pedroni, Jason Brudvik, J. R. M. Annand, Sasa Micanovic, H. J. Arends, A. Fix, E. F. McNicoll, G. Rosner, S. Schumann, R. W. Novotny, P. B. Otte, B. Krusche, Michaela Thiel, D. M. Manley, M. Korolija, S. N. Prakhov, Andy Thomas, J. C. McGeorge, V. Lisin, O. Jahn, David Hamilton, P. Drexler, I. Supek
Rok vydání: 2010
Předmět:
Zdroj: Physics Letters B. 693:551-554
ISSN: 0370-2693
Popis: The circular photon asymmetry for π 0 η 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 ) D 33 resonance. The measured asymmetry allows us to identify small contributions from positive-parity resonances via interference terms with the dominant D 33 amplitude.
Databáze: OpenAIRE
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