The European Physical Journal A - Hadrons and Nuclei

, Volume 9, Issue 1, pp 5–8

Photoproduction of neutral pion pairs from the proton

  • M. Wolf
  • J. Ahrens
  • R. Beck
  • V. Hejny
  • J.D. Kellie
  • M. Kotulla
  • B. Krusche
  • V. Kuhr
  • R. Leukel
  • V. Metag
  • J.C. Nacher
  • R. Novotny
  • V. Olmos de León
  • R.O. Owens
  • F. Rambo
  • A. Schmidt
  • M. Schumacher
  • U. Siodlaczek
  • H. Ströher
  • J. Weiß
  • F. Wissmann
Short note

DOI: 10.1007/s100500070048

Cite this article as:
Wolf, M., Ahrens, J., Beck, R. et al. Eur Phys J A (2000) 9: 5. doi:10.1007/s100500070048

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 Eγ = 740 MeV. Dalitz plots of m20π0) versusm2(p0) for seven bins of incident photon energy have been analysed. For Eγ > 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 D13(1520) and also the P11(1440)-resonance.

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

Copyright information

© Società Italiana di Fisica and Springer-Verlag 2000

Authors and Affiliations

  • M. Wolf
    • 1
  • J. Ahrens
    • 2
  • R. Beck
    • 2
  • V. Hejny
    • 1
  • J.D. Kellie
    • 3
  • M. Kotulla
    • 1
  • B. Krusche
    • 1
  • V. Kuhr
    • 4
  • R. Leukel
    • 2
  • V. Metag
    • 1
  • J.C. Nacher
    • 6
  • R. Novotny
    • 1
  • V. Olmos de León
    • 2
  • R.O. Owens
    • 3
  • F. Rambo
    • 4
  • A. Schmidt
    • 2
  • M. Schumacher
    • 4
  • U. Siodlaczek
    • 5
  • H. Ströher
    • 1
  • J. Weiß
    • 1
  • F. Wissmann
    • 4
  1. 1.II. Physikalisches Institut, Universität Gießen, D-35392 Gießen, GermanyDE
  2. 2.Institut für Kernphysik, Johannes-Gutenberg-Universität Mainz, D-55099 Mainz, GermanyDE
  3. 3.Department of Physics and Astronomy, University of Glasgow, Glasgow G128QQ, UKGB
  4. 4.II. Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, GermanyDE
  5. 5.Physikalisches Institut, Universität Tübingen, D-72076 Tübingen, GermanyDE
  6. 6.Departamento de Fısica Teórica and IFIC, Universidad de Valencia, 46100 Burjassot, SpainES