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The European Physical Journal A

, Volume 33, Issue 2, pp 169–184 | Cite as

Measurement of η photoproduction on the proton from threshold to 1500 MeV

  • The GRAAL Collaboration
  • O. Bartalini
  • V. Bellini
  • J. P. Bocquet
  • P. Calvat
  • M. Capogni
  • L. Casano
  • M. Castoldi
  • A. D'Angelo
  • J. -P. Didelez
  • R. Di Salvo
  • A. Fantini
  • D. Franco
  • C. Gaulard
  • G. Gervino
  • F. Ghio
  • G. Giardina
  • B. Girolami
  • A. Giusa
  • M. Guidal
  • E. Hourany
  • R. Kunne
  • A. Lapik
  • P. Levi Sandri
  • A. LleresEmail author
  • F. Mammoliti
  • G. Mandaglio
  • D. Moricciani
  • A. N. Mushkarenkov
  • V. Nedorezov
  • L. Nicoletti
  • C. Perrin
  • C. Randieri
  • D. Rebreyend
  • F. Renard
  • N. Rudnev
  • T. Russew
  • G. Russo
  • C. Schaerf
  • M. -L. Sperduto
  • M. -C. Sutera
  • A. Turinge
  • V. Vegna
Regular Article - Experimental Physics

Abstract.

Beam asymmetry and differential cross-section for the reaction γp → ηp were measured from production threshold to 1500MeV photon laboratory energy. The two dominant neutral decay modes of the η -meson, η → 2γ and η → 3π0 , were analyzed. The full set of measurements is in good agreement with previously published results. Our data were compared with three models. They all fit satisfactorily the results but their respective resonance contributions are quite different. The possible photoexcitation of a narrow state N(1670) was investigated and no evidence was found.

PACS.

13.60.Le Meson production 13.88.+e Polarization in interactions and scattering 25.20.Lj Photoproduction reactions 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • The GRAAL Collaboration
  • O. Bartalini
    • 2
    • 9
  • V. Bellini
    • 12
    • 5
  • J. P. Bocquet
    • 1
  • P. Calvat
    • 1
  • M. Capogni
    • 2
    • 9
  • L. Casano
    • 9
  • M. Castoldi
    • 7
  • A. D'Angelo
    • 2
    • 9
  • J. -P. Didelez
    • 14
  • R. Di Salvo
    • 9
  • A. Fantini
    • 2
    • 9
  • D. Franco
    • 2
    • 9
  • C. Gaulard
    • 4
  • G. Gervino
    • 3
    • 10
  • F. Ghio
    • 8
    • 11
  • G. Giardina
    • 6
    • 15
  • B. Girolami
    • 8
    • 11
  • A. Giusa
    • 12
    • 6
  • M. Guidal
    • 14
  • E. Hourany
    • 14
  • R. Kunne
    • 14
  • A. Lapik
    • 13
  • P. Levi Sandri
    • 4
  • A. Lleres
    • 1
    Email author
  • F. Mammoliti
    • 12
    • 6
  • G. Mandaglio
    • 6
    • 15
  • D. Moricciani
    • 9
  • A. N. Mushkarenkov
    • 13
  • V. Nedorezov
    • 13
  • L. Nicoletti
    • 2
    • 9
    • 1
  • C. Perrin
    • 1
  • C. Randieri
    • 12
    • 5
  • D. Rebreyend
    • 1
  • F. Renard
    • 1
  • N. Rudnev
    • 13
  • T. Russew
    • 1
  • G. Russo
    • 12
    • 6
  • C. Schaerf
    • 2
    • 9
  • M. -L. Sperduto
    • 12
    • 6
  • M. -C. Sutera
    • 6
  • A. Turinge
    • 13
  • V. Vegna
    • 2
    • 9
  1. 1.LPSCUniversité Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de GrenobleGrenobleFrance
  2. 2.Dipartimento di FisicaUniversità di Roma “Tor Vergata”RomaItaly
  3. 3.Dipartimento di Fisica SperimentaleUniversità di TorinoTorinoItaly
  4. 4.Laboratori Nazionali di FrascatiINFNFrascatiItaly
  5. 5.Laboratori Nazionali del SudINFNCataniaItaly
  6. 6.Sezione di CataniaINFNCataniaItaly
  7. 7.Sezione di GenovaINFNGenovaItaly
  8. 8.Sezione di RomaINFNRomaItaly
  9. 9.Sezione di Roma “Tor Vergata”INFNRomaItaly
  10. 10.Sezione di TorinoINFNTorinoItaly
  11. 11.Istituto Superiore di SanitàRomaItaly
  12. 12.Dipartimento di Fisica ed AstronomiaUniversità di CataniaCataniaItaly
  13. 13.Institute for Nuclear ResearchMoscowRussia
  14. 14.IPNOUniversité Paris-Sud 11, CNRS/IN2P3OrsayFrance
  15. 15.Dipartimento di FisicaUniversità di MessinaMessinaItaly

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