/ nucl-ex arXiv:1408.3274

Measurement of the transverse target and beam-target asymmetries in $\eta$ meson photoproduction at MAMI

Akondi, C.S. (Kent State U.) ; Annand, J.R.M. (Glasgow U.) ; Arends, H.J. (Mainz U., Inst. Kernphys.) ; Beck, R. (Bonn U., HISKP) ; Bernstein, A. (MIT) ; Borisov, N. (Dubna, JINR) ; Braghieri, A. (INFN, Pavia) ; Briscoe, W.J. (George Washington U.) ; Cherepnya, S. (Lebedev Inst.) ; Collicott, C. (St. Mary's U., Halifax) ; Costanza, S. (INFN, Pavia) ; Downie, E.J. (George Washington U.) ; Dieterle, M. (Basel U.) ; Fix, A. (Tomsk Polytechnic U.) ; Fil'kov, L.V. (Lebedev Inst.) ; Garni, S. (Basel U.) ; Glazier, D.I. (Glasgow U.) ; Gradl, W. (Mainz U., Inst. Kernphys.) ; Gurevich, G. (Moscow, INR) ; Barrientos, P.Hall (Edinburgh U.) ; Hamilton, D. (Glasgow U.) ; Hornidge, D. (Mt. Allison U.) ; Howdle, D. (Glasgow U.) ; Huber, G.M. (Regina U.) ; Kashevarov, V.L. (Lebedev Inst.) ; Keshelashvili, I. (Basel U.) ; Kondratiev, R. (Moscow, INR) ; Korolija, M. (Boskovic Inst., Zagreb) ; Krusche, B. (Basel U.) ; Lazarev, A. (Dubna, JINR) ; Lisin, V. (Moscow, INR) ; Livingston, K. (Glasgow U.) ; MacGregor, I.J.D. (Glasgow U.) ; Mancel, J. (Glasgow U.) ; Manley, D.M. (Kent State U.) ; Martel, P. (MIT) ; McNicoll, E.F. (Glasgow U.) ; Meyer, W. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Middleton, D. (Mainz U., Inst. Kernphys.) ; Miskimen, R. (Massachusetts U., Amherst) ; Mushkarenkov, A. (Massachusetts U., Amherst) ; Nefkens, B.M.K. (UCLA) ; Neganov, A. (Dubna, JINR) ; Nikolaev, A. (Bonn U., HISKP) ; Oberle, M. (Basel U.) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Ortega, H. (Mainz U., Inst. Kernphys.) ; Ott, P. (Mainz U., Inst. Kernphys.) ; Otte, P.B. (Mainz U., Inst. Kernphys.) ; Oussena, B. (George Washington U.) ; Pedroni, P. (INFN, Pavia) ; Polonski, A. (Moscow, INR) ; Polyanski, V.V. (Lebedev Inst.) ; Prakhov, S. (UCLA) ; Reicherz, G. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Rostomyan, T. (Basel U.) ; Sarty, A. (St. Mary's U., Halifax) ; Schumann, S. (MIT) ; Steffen, O. (Mainz U., Inst. Kernphys.) ; Strakovsky, I.I. (George Washington U.) ; Strub, Th. (Basel U.) ; Supek, I. (Boskovic Inst., Zagreb) ; Tiator, L. (Mainz U., Inst. Kernphys.) ; Thomas, A. (Mainz U., Inst. Kernphys.) ; Unverzagt, M. (Mainz U., Inst. Kernphys.) ; Usov, Yu. A. (Dubna, JINR) ; Watts, D.P. (Edinburgh U.) ; Werthmuller, D. (Basel U.) ; Witthauer, L. (Basel U.) ; Wolfes, M. (Mainz U., Inst. Kernphys.)

Pages: 5

Abstract: We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in the $\vec \gamma \vec p\to\eta p$ 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.

Web-Page: http://inspirehep.net/record/1310837/files/fig1.png; http://inspirehep.net/record/1310837/files/fig3.png; http://inspirehep.net/record/1310837/files/fig4.png; http://inspirehep.net/record/1310837/files/fig2.png; http://inspirehep.net/record/1310837/files/arXiv:1408.3274.pdf

Note: *Temporary entry*; 5 pages, 3 figures, accepted for publication in PRL

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