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First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p reaction

Authors :
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.
Fil'kov, L. V.
Glazier, D. I.
Gregor, R.
Hamilton, D.
Heid, E.
Hornidge, D.
Jaegle, I.
Jahn, O.
Jude, T. C.
Kellie, J. D.
Keshelashvili, I.
Kondratiev, R.
Korolija, M.
Kotulla, M.
Koulbardis, A.
Kruglov, S.
Krusche, B.
Lisin, V.
Livingston, K.
MacGregor, I. J. D.
Maghrbi, Y.
Manley, D. M.
Martinez-Fabregate, M.
McGeorge, J. C.
McNicoll, E. F.
Mekterovic, D.
Metag, V.
Micanovic, S.
Middleton, D.
Mushkarenkov, A.
Nefkens, B. M. K.
Nikolaev, A.
Novotny, R.
Ostrick, M.
Otte, P. B.
Oussena, B.
Pedroni, P.
Pheron, F.
Polonski, A.
Prakhov, S. N.
Robinson, J.
Rosner, G.
Rostomyan, T.
Schumann, S.
Sikora, M. H.
Sober, D.
Starostin, A.
Stakovsky, I. I.
Suarez, I. M.
Supek, I.
Tarbert, C.
Thiel, M.
Thomas, A.
Unverzagt, M.
Watts, D. P.
Werthmüller, D.
Zamboni, I.
Zehr., F.
Source :
Phys.Lett.B693:551-554,2010
Publication Year :
2010

Abstract

The circular photon asymmetry for pi0 eta 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 Delta(1700)D33 resonance. The measured asymmetry allows us to identify small contributions from positive-parity resonances via interference terms with the dominant D33 amplitude.<br />Comment: 11 pages, 3 figures, submitted to Phys.Lett. B

Subjects

Subjects :
Nuclear Experiment
High Energy Physics - Experiment
Nuclear Theory

Details

Database :
arXiv
Journal :
Phys.Lett.B693:551-554,2010
Publication Type :
Report
Accession number :
edsarx.1009.4093
Document Type :
Working Paper
Full Text :
https://doi.org/10.1016/j.physletb.2010.09.028
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