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Measurement of the beam asymmetry in η photoproduction off the proton

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Abstract.

The beam asymmetry, Σ , was measured at ELSA in the reaction \( \boldsymbol\gamma\) p → ηp using linearly polarised tagged photon beams, produced by coherent bremsstrahlung off a diamond. The crystal was oriented to provide polarised photons in the energy range E γ = 800 to 1400MeV with the maximum polarisation of P γ = 49 % obtained at 1305MeV. Both dominant decay modes of the η into two photons and 3π0 were used to extract the beam asymmetry from the azimuthal modulation of the cross-section. The measurements cover the angular range Θcm ≃ 50 -150 degrees. Large asymmetries up to 80% are observed, in agreement with a previous measurement. The eta-MAID model and the Bonn-Gatchina partial wave analysis describe the measurements, but the required partial waves differ significantly.

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Authors and Affiliations

  1. Physikalisches Institut der Universität Bonn, Germany

    D. Elsner, B. Bantes, H. Dutz, R. Ewald, K. Fornet-Ponse, R. Gothe, S. Höffgen, S. Kammer, V. Kleber, Frank Klein, Friedrich Klein, M. Konrad, J. Langheinrich, D. Menze, C. Morales, M. Ostrick, H. Schmieden, B. Schoch, A. Süle & D. Walther

  2. Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Germany

    A. V. Anisovich, O. Bartholomy, D. E. Bayadilov, R. Beck, V. Crede, A. Ehmanns, K. Essig, I. Fabry, M. Fuchs, C. Funke, E. Gutz, P. Hoffmeister, I. Horn, J. Junkersfeld, H. Kalinowsky, E. Klempt, M. Lang, J. Lotz, V. A. Nikonov, D. V. Novinski, H. van Pee, A. V. Sarantsev, C. Schmidt, T. Szczepanek, U. Thoma, C. Weinheimer & C. Wendel

  3. Petersburg Nuclear Physics Institute, Gatchina, Russia

    A. V. Anisovich, D. E. Bayadilov, Y. A. Beloglazov, A. B. Gridnev, I. V. Lopatin, V. A. Nikonov, D. V. Novinski, A. K. Radkov, A. V. Sarantsev & V. V. Sumachev

  4. Physikalisches Institut, Universität Erlangen, Germany

    G. Anton, R. Bogendörfer, J. Hössl & G. Suft

  5. KVI, University of Groningen, The Netherlands

    J. C. S. Bacelar, R. Castelijns, H. Löhner, J. G. Messchendorp & S. Shende

  6. Department of Physics, Florida State University, Tallahassee, FL, USA

    V. Crede

  7. Physikalisches Institut, Ruhr-Universität Bochum, Germany

    H. Flemming, H. Koch, B. Kopf & H. Matthäy

  8. Physikalisches Institut, Universität Basel, Switzerland

    I. Jaegle, M. Kotulla, B. Krusche & T. Mertens

  9. II. Physikalisches Institut, Universität Giessen, Germany

    R. Gregor, M. Kotulla, S. Lugert, V. Metag, M. Nanova, R. Novotny, L. M. Pant, H. van Pee, M. Pfeiffer, S. Schadmand, U. Thoma & D. Trnka

Authors
  1. D. Elsner
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  2. A. V. Anisovich
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  3. G. Anton
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  4. J. C. S. Bacelar
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  5. B. Bantes
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  6. O. Bartholomy
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  7. D. E. Bayadilov
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  8. R. Beck
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  9. Y. A. Beloglazov
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  10. R. Bogendörfer
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  11. R. Castelijns
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  12. V. Crede
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  13. H. Dutz
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  14. A. Ehmanns
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  18. H. Flemming
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  19. K. Fornet-Ponse
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  20. M. Fuchs
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  21. C. Funke
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  22. R. Gothe
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  23. R. Gregor
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  24. A. B. Gridnev
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  25. E. Gutz
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  28. I. Horn
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  29. J. Hössl
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  30. I. Jaegle
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  31. J. Junkersfeld
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  32. H. Kalinowsky
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  33. S. Kammer
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  34. V. Kleber
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  35. Frank Klein
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  36. Friedrich Klein
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  37. E. Klempt
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  38. H. Koch
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  39. M. Konrad
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  40. B. Kopf
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  41. M. Kotulla
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  42. B. Krusche
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  53. V. Metag
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  65. S. Schadmand
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  66. C. Schmidt
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  67. H. Schmieden
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  69. S. Shende
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  70. G. Suft
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  71. A. Süle
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  72. V. V. Sumachev
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  73. T. Szczepanek
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  74. U. Thoma
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  75. D. Trnka
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  76. D. Walther
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  78. C. Wendel
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The CBELSA/TAPS Collaboration

Corresponding author

Correspondence to H. Schmieden.

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W. Henning

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The CBELSA/TAPS Collaboration., Elsner, D., Anisovich, A.V. et al. Measurement of the beam asymmetry in η photoproduction off the proton. Eur. Phys. J. A 33, 147–155 (2007). https://doi.org/10.1140/epja/i2007-10447-9

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  • DOI: https://doi.org/10.1140/epja/i2007-10447-9

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