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

Krambrich, D. and Zehr, F. and Fix, A. and Roca, L. and Aguar, P. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and Beck, R. and Bekrenev, V. and Boillat, B. and Braghieri, A. and Branford, D. and Briscoe, W. J. and Brudvik, J. and Cherepnya, S. and Codling, R. and Downie, E. J. and Dexler, P. and Glazier, D. I. and Grabmayr, P. and Gregor, R. and Heid, E. and Hornidge, D. and Jahn, O. and Kashevarov, V. L. and Knezevic, A. and Kondratiev, R. and Korolija, M. and Kotulla, M. and Krusche, B. and Kulbardis, A. and Lang, M. and Lisin, V. and Livingston, K. and Lugert, S. and MacGregor, I. J. D. and Manley, D. M. and Martinez, M. and McGeorge, J. C. and Mekterovic, D. and Metag, V. and Nefkens, B. M. K. and Nikolaev, A. and Pedroni, P. and Pheron, F. and Polonski, A. and Prakhov, S. N. and Price, J. W. and Rosner, G. and Rost, M. and Rostomyan, T. and Schumann, S. and Sober, D. and Starostin, A. and Supek, I. and Tarbert, C. M. and Thomas, A. and Unverzagt, M. and Walcher, Th. and Watts, D. P.. (2009) Beam-helicity asymmetries in double-pion photoproduction off the proton. Physical review letters, Vol. 103, H. 5 , 052002, 5 S..

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Official URL: http://edoc.unibas.ch/dok/A5261906

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Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz in the three isospin channels (gamma) over right arrowp -< pi(+)pi(0)n, (gamma) over right arrowp -< pi(0)pi(0)p and (gamma) over right arrowp -< pi(+)pi(-)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 pi(0) mesons were detected in a 4 pi 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:53

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