Short note

The European Physical Journal A - Hadrons and Nuclei

, Volume 9, Issue 1, pp 5-8

Photoproduction of neutral pion pairs from the proton

  • M. WolfAffiliated withII. Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany
  • , J. AhrensAffiliated withInstitut für Kernphysik, Johannes-Gutenberg-Universität Mainz, D-55099 Mainz, Germany
  • , R. BeckAffiliated withInstitut für Kernphysik, Johannes-Gutenberg-Universität Mainz, D-55099 Mainz, Germany
  • , V. HejnyAffiliated withII. Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany
  • , J.D. KellieAffiliated withDepartment of Physics and Astronomy, University of Glasgow, Glasgow G128QQ, UK
  • , M. KotullaAffiliated withII. Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany
  • , B. KruscheAffiliated withII. Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany
  • , V. KuhrAffiliated withII. Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, Germany
  • , R. LeukelAffiliated withInstitut für Kernphysik, Johannes-Gutenberg-Universität Mainz, D-55099 Mainz, Germany
    • , V. MetagAffiliated withII. Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany
    • , J.C. NacherAffiliated withDepartamento de Fısica Teórica and IFIC, Universidad de Valencia, 46100 Burjassot, Spain
    • , R. NovotnyAffiliated withII. Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany
    • , V. Olmos de LeónAffiliated withInstitut für Kernphysik, Johannes-Gutenberg-Universität Mainz, D-55099 Mainz, Germany
    • , R.O. OwensAffiliated withDepartment of Physics and Astronomy, University of Glasgow, Glasgow G128QQ, UK
    • , F. RamboAffiliated withII. Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, Germany
    • , A. SchmidtAffiliated withInstitut für Kernphysik, Johannes-Gutenberg-Universität Mainz, D-55099 Mainz, Germany
    • , M. SchumacherAffiliated withII. Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, Germany
    • , U. SiodlaczekAffiliated withPhysikalisches Institut, Universität Tübingen, D-72076 Tübingen, Germany
    • , H. StröherAffiliated withII. Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany
    • , J. WeißAffiliated withII. Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany
    • , F. WissmannAffiliated withII. Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, Germany

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Abstract:

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 μb at E γ = 740 MeV. Dalitz plots of m 20π0) versus m 2(p0) for seven bins of incident photon energy have been analysed. For E γ > 610 MeV, a strong contribution of a sequential decay is observed with the Δ(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.

PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions