Beam-helicity asymmetries in double-pion photoproduction off the proton

Krambrich, D. et al. (2009) Beam-helicity asymmetries in double-pion photoproduction off the proton. Physical Review Letters, 103(5), 052002. (doi:10.1103/PhysRevLett.103.052002)

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Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz in the three isospin channels γ⃗ p→π<sup>+</sup>π<sup>0</sup>n, γ⃗ p→π<sup>0</sup>π<sup>0</sup>p, and γ⃗ p→π<sup>+</sup>π<sup>−</sup>p. The circularly polarized photons, produced from bremsstrahlung of longitudinally polarized electrons, were tagged with the Glasgow magnetic spectrometer. Charged pions and the decay photons of π0 mesons were detected in a 4π electromagnetic calorimeter which combined the Crystal Ball detector with the TAPS detector. The precisely measured asymmetries are very sensitive to details of the production processes and are thus key observables in the modeling of the reaction dynamics.

Item Type:Articles
Glasgow Author(s) Enlighten ID:McGeorge, Dr John and Downie, Dr Evangeline and Livingston, Dr Kenneth and MacGregor, Professor Douglas and Annand, Dr John and Glazier, Dr Derek and Rosner, Professor Guenther
Authors: Krambrich, D., Zehr, F., Fix, A., Roca, L., Aguar, P., Ahrens, J., Annand, J.R.M., Arends, H.J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W.J., Brudvik, J., Cherepnya, S., Codling, R., Downie, E.J., Dexler, P., Glazier, D.I., Grabmayr, P., Gregor, R., Heid, E., Hornidge, D., Jahn, O., Kashevarov, V.L., Knezevic, A., Kondratiev, R., Korolija, M., Kotulla, M., Krusche, B., Kulbardis, A., Lang, M., Lisin, V., Livingston, K., Lugert, S., MacGregor, I.J.D., Manley, D.M., Martinez, M., McGeorge, J.C., Mekterovic, D., Metag, V., Nefkens, B.M.K., Nikolaev, A., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S.N., Price, J.W., Rosner, G., Rost, M., Rostomyan, T., Schumann, S., Sober, D., Starostin, A., Supek, I., Tarbert, C.M., Thomas, A., Unverzagt, M., Walcher, T., and Watts, D.P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114

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