The European Physical Journal A

, Volume 33, Issue 2, pp 133–146 | Cite as

Photoproduction of η -mesons off protons

  • The CB-ELSA Collaboration
  • O. Bartholomy
  • R. Bogendörfer
  • V. Credé
  • I. Fabry
  • A. V. Anisovich
  • G. Anton
  • R. Bantes
  • Y. A. Beloglazov
  • R. Castelijns
  • A. Ehmanns
  • J. Ernst
  • H. Flemming
  • A. Fösel
  • M. Fuchs
  • Ch. Funke
  • R. Gothe
  • A. B. Gridnev
  • E. Gutz
  • S. Höffgen
  • I. Horn
  • J. Hößl
  • J. Junkersfeld
  • H. Kalinowsky
  • F. Klein
  • E. Klempt
  • H. Koch
  • M. Konrad
  • B. Kopf
  • B. Krusche
  • J. Langheinrich
  • H. Löhner
  • I. V. Lopatin
  • J. Lotz
  • H. Matthäy
  • D. Menze
  • J. Messchendorp
  • V. A. Nikonov
  • D. V. Novinski
  • M. Ostrick
  • H. van Pee
  • A. K. Radkov
  • A. V. Sarantsev
  • S. Schadmand
  • C. Schmidt
  • H. Schmieden
  • B. Schoch
  • G. Suft
  • V. V. Sumachev
  • T. Szczepanek
  • U. Thoma
  • D. Walther
  • Ch. Weinheimer
Regular Article - Experimental Physics

Abstract.

Photoproduction of η -mesons was studied with the Crystal-Barrel detector at ELSA for photon energies in the range from 0.75 to 3GeV. Total and differential cross-sections are presented. The η mesons are detected in two decay modes, in η → 2γ and in η → 3π0 → 6γ . The cross-sections vary slowly as functions of energy and η production angle suggesting that only few resonances make significant contributions to the cross-section. For photon energies above 1.5GeV, the differential cross-sections show a strong forward peak due to meson exchanges in the t channel. A comparison of the η -photoproduction cross-sections with SAID and MAID as well as with a partial-wave analysis performed on our data in combination with other data sets shows good agreement. The Bonn-Gatchina partial-wave analysis suggests that the largest contribution to η photoproduction for energies below 3GeV proceeds via three resonances, the well-known N(1535)S11 , via N(1720)P13 , and a newly suggested N(2070)D15 .

PACS.

13.30.-a Decays of baryons 13.60.Le Meson production 14.20.Gk Baryon resonances with S = 0  

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • The CB-ELSA Collaboration
  • O. Bartholomy
    • 1
  • R. Bogendörfer
    • 2
  • V. Credé
    • 1
    • 3
  • I. Fabry
    • 1
  • A. V. Anisovich
    • 1
    • 4
  • G. Anton
    • 2
  • R. Bantes
    • 5
  • Y. A. Beloglazov
    • 4
  • R. Castelijns
    • 6
  • A. Ehmanns
    • 1
  • J. Ernst
    • 1
  • H. Flemming
    • 7
  • A. Fösel
    • 2
  • M. Fuchs
    • 1
  • Ch. Funke
    • 1
  • R. Gothe
    • 5
  • A. B. Gridnev
    • 4
  • E. Gutz
    • 1
  • S. Höffgen
    • 5
  • I. Horn
    • 1
  • J. Hößl
    • 2
  • J. Junkersfeld
    • 1
  • H. Kalinowsky
    • 1
  • F. Klein
    • 5
  • E. Klempt
    • 1
  • H. Koch
    • 7
  • M. Konrad
    • 5
  • B. Kopf
    • 7
  • B. Krusche
    • 8
  • J. Langheinrich
    • 5
  • H. Löhner
    • 6
  • I. V. Lopatin
    • 4
  • J. Lotz
    • 1
  • H. Matthäy
    • 7
  • D. Menze
    • 5
  • J. Messchendorp
    • 9
  • V. A. Nikonov
    • 1
    • 4
  • D. V. Novinski
    • 4
  • M. Ostrick
    • 5
  • H. van Pee
    • 1
  • A. K. Radkov
    • 4
  • A. V. Sarantsev
    • 1
    • 4
  • S. Schadmand
    • 9
  • C. Schmidt
    • 1
  • H. Schmieden
    • 5
  • B. Schoch
    • 5
  • G. Suft
    • 2
  • V. V. Sumachev
    • 4
  • T. Szczepanek
    • 1
  • U. Thoma
    • 1
    • 9
  • D. Walther
    • 1
    • 5
  • Ch. Weinheimer
    • 1
  1. 1.Helmholtz-Institut für Strahlen- und KernphysikUniversität BonnGermany
  2. 2.Physikalisches InstitutUniversität ErlangenGermany
  3. 3.Department of PhysicsFlorida State UniversityTallahasseeUSA
  4. 4.Petersburg Nuclear Physics InstituteGatchinaRussia
  5. 5.Physikalisches InstitutUniversität BonnGermany
  6. 6.Kernfysisch Versneller InstituutGroningenThe Netherlands
  7. 7.Institut für Experimentalphysik IUniversität BochumGermany
  8. 8.Institut für PhysikUniversität BaselSwitzerland
  9. 9.II. Physikalisches InstitutUniversität GießenGermany

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