Photoproduction of neutral pion pairs from the proton

Wolf, M. and Ahrens, J. and Beck, R. and Hejny, V. and Kellie, J. D. and Kotulla, M. and Krusche, B. and Kuhr, V. and Leukel, R. and Metag, V. and Nacher, J. C. and Novotny, R. and de Leon, V. O. and Owens, R. O. and Rambo, F. and Schmidt, A. and Schumacher, M. and Siodlaczek, U. and Stroher, H. and Weiss, J. and Wissmann, F.. (2000) Photoproduction of neutral pion pairs from the proton. The European physical journal. A, Hadrons and nuclei, Vol. 9, H. 1. pp. 5-8.

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Official URL: http://edoc.unibas.ch/dok/A5261969

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Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass analysis. From threshold up to 370 MeV the total cross-section does not exceed 30 nb. For higher energies it shows a smooth rise until it reaches a maximum of about 10 mub at E-gamma = 740 MeV. Dalitz plots Of m(2)(pi (0), pi (0)) versus m(2)(p, pi (0)) for seven bins of incident photon energy have been analysed. For E-gamma < 610 MeV, a strong contribution of a sequential decay is observed with the Delta (1232)-resonance as intermediate state. A comparison to model calculations shows that these sequential decays presumably originate from the D-13(1520)- and also the P-11(1440)-resonance.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
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 13:55

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