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

• Main Authors: Akondi, C. S (Author), Annand, J. R. M (Author), Arends, H. J (Author), Beck, R. (Author), Borisov, N. (Author), Braghieri, A. (Author), Briscoe, W. J (Author), Cherepnya, S. (Author), Collicott, C. (Author), Costanza, S. (Author), Downie, E. J (Author), Dieterle, M. (Author), Fix, A. (Author), Fil'kov, L. V (Author), Garni, S. (Author), Glazier, D. I (Author), Gradl, W. (Author), Gurevich, G. (Author), Hall Barrientos, P. (Author), Hamilton, D. (Author), Hornidge, D. (Author), Howdle, D. (Author), Huber, G. M (Author), Kashevarov, V. L (Author), Keshelashvili, I. (Author), Kondratiev, R. (Author), Korolija, M. (Author), Krusche, B. (Author), Lazarev, A. (Author), Lisin, V. (Author), Livingston, K. (Author), MacGregor, I. J. D (Author), Mancell, J. (Author), Manley, D. M (Author), Martel, Philippe Paul (Author), McNicoll, E. F (Author), Meyer, W. (Author), Middleton, D. G. (Author), Miskimen, R. (Author), Mushkarenkov, A. (Author), Nefkens, B. M. K (Author), Neganov, A. (Author), Nikolaev, A. (Author), Oberle, M. (Author), Ostrick, M. (Author), Ortega, H. (Author), Ott, P. (Author), Otte, P. B (Author), Oussena, B. (Author), Pedroni, P. (Author), Polonski, A. (Author), Polyanski, V. V (Author), Prakhov, S. (Author), Reicherz, G. (Author), Rostomyan, T. (Author), Sarty, A. (Author), Schumann, S. (Contributor), Steffen, O. (Author), Strakovsky, I. I (Author), Strub, Th (Author), Supek, I. (Author), Tiator, L. (Author), Thomas, A. (Author), Unverzagt, M. (Author), Usov, Yu. A (Author), Watts, D. P (Author), Werthmüller, D. (Author), Witthauer, L. (Author), Wolfes, M. (Author), Bernstein, Aron M. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Martel, P. (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2014-09-05T15:33:31Z.
• Subjects: Article
• Online Access: Get fulltext

 We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in the [→ over γ][→ over p] → ηp 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 η meson photoproduction. The peculiar nodal structure observed in existing T data close to threshold is not confirmed.