Measurement of the Transverse Target and Beam-Target Asymmetries in eta Meson Photoproduction at MAMI

A2 Collaboration MAMI, C. S. Akondi*, J. R. M. Annand, H. J. Arends, R. Beck, A. Bernstein, N. Borisov, A. Braghieri, W. J. Briscoe, S. Cherepnya, C. Collicott, S. Costanza, E. J. Downie, M. Dieterle, A. Fix, L. V. Fil'kov, S. Garni, D. I. Glazier, W. Gradl, G. GurevichP. Hall Barrientos, D. Hamilton, D. Hornidge, D. Howdle, G. M. Huber, V. L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, B. Krusche, A. Lazarev, V. Lisin, K. Livingston, I. J. D. MacGregor, J. Mancel, D. M. Manley, P. Martel, E. F. McNicoll, W. Meyer, D. Middleton, R. Miskimen, A. Mushkarenkov, B. M. K. Nefkens, A. Neganov, A. Nikolaev, M. Oberle, M. Ostrick, H. Ortega, P. Ott, P. B. Otte, D. P. Watts

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in the (gamma) over right arrow (p) over right arrow -> eta p reaction up to a center-of-mass energy of W = 1.9 GeV. The data were obtained with the Crystal-Ball/ TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. All existing model predictions fail to reproduce the new data indicating a significant impact on our understanding of the underlying dynamics of eta meson photoproduction. The peculiar nodal structure observed in existing T data close to threshold is not confirmed.

Original languageEnglish
Article number102001
Number of pages5
JournalPhysical Review Letters
Volume113
Issue number10
DOIs
Publication statusPublished - 4 Sep 2014

Keywords

  • TAGGED PHOTON SPECTROMETER
  • RESONANCES
  • MICROTRON
  • NUCLEON
  • PROTON
  • TAPS

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