arXiv:1009.4093·v2·Nuclear Experiment
First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p 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🇬🇧
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.
Comments: 11 pages, 3 figures, submitted to Phys.Lett. B