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Photoproduction of pi(0)pi(0)- and pi(0)pi(+)-pairs off the proton from threshold to the second resonance region

Zehr, F. and Krusche, B. 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. F. B. and Downie, E. J. and Drexler, P. and Glazier, D. I. and Fil`kov, L. V. and Fix, A. and Gregor, R. and Heid, E. and Hornidge, D. and Jaegle, I. and Jahn, O. and Kashevarov, V. L. and Knezevic, A. and Kondratiev, R. and Korolija, M. and Kotulla, M. and Krambrich, D. 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 Maghrbi, Y. and Martinez, M. and McGeorge, J. C. and Mekterovic, D. and Metag, V. and Nefkens, B. M. K. and Nikolaev, A. and Ostrick, M. and Pedroni, P. and Pheron, F. and Polonski, A. and Prakhov, S. 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.. (2012) Photoproduction of pi(0)pi(0)- and pi(0)pi(+)-pairs off the proton from threshold to the second resonance region. The European physical journal. A, Hadrons and nuclei, Vol. 48, H. 7. p. 98.

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Official URL: http://edoc.unibas.ch/dok/A6070659

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Abstract

Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing p pi(0)pi(0) and n pi(+)pi(0) final states from the threshold region up to 800 MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550 MeV-820 MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4 pi solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer-Verlag
ISSN:1434-6001
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:01 Mar 2013 11:13
Deposited On:01 Mar 2013 11:09

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