Measurement of the transverse target and beam-target asymmetries in η Meson Photoproduction at MAMI

Akondi, C. S. et al. (2014) Measurement of the transverse target and beam-target asymmetries in η Meson Photoproduction at MAMI. Physical Review Letters, 113(10), p. 102001. (doi: 10.1103/PhysRevLett.113.102001)

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We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in the γ⃗ p⃗ →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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Glazier, Dr Derek and MacGregor, Professor Douglas and Livingston, Dr Kenneth and Howdle, Mr David and McNicoll, Miss Eilidh and Mancell, Mr Joe and Annand, Dr John and Hamilton, Dr David
Authors: Akondi, C. S., Annand, J.R.M., Arends, H.J., Beck, R., Bernstein, A., Borisov, N., Braghieri, A., Briscoe, W.J., Cherepnya, S., Collicott, C., Costanza, S., Downie, E.J., Dieterle, M., Fix, A., Fil’kov, L.V., Garni, S., Glazier, D.I., Gradl, W., Gurevich, G., Hall Barrientos, P., Hamilton, D., Hornidge, D., Howdle, D., Huber, G.M., Kashevarov, V.L., Keshelashvili, I., Kondratiev, R., Korolija, M., Krusche, B., Lazarev, A., Lisin, V., Livingston, K., MacGregor, I.J.D., Mancell, J., Manley, D.M., Martel, P., McNicoll, E.F., Meyer, W., Middleton, D., Miskimen, R., Mushkarenkov, A., Nefkens, B.M.K., Neganov, A., Nikolaev, A., Oberle, M., Ostrick, M., Ortega, H., Ott, P., Otte, P.B., Oussena, B., Pedroni, P., Polonski, A., Polyanski, V.V., Prakhov, S., Reicherz, G., Rostomyan, T., Sarty, A., Schumann, S., Steffen, O., Strakovsky, I.I., Strub, T., Supek, I., Tiator, L., Thomas, A., Unverzagt, M., Usov, Y.A., Watts, D.P., Werthmüller, D., Witthauer, L., and Wolfes, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114

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