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

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.; Mancel, 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, Th.; Supek, I.; Tiator, L.; Thomas, A.; Unverzagt, M.; Usov, Yu. A.; Watts, D. P.; Werthmüller, D.; Witthauer, L.; Wolfes, M.

Author(s)

Akondi, C. S.; Annand, J. R. M.; Arends, H. J.; Beck, R.; Borisov, N.; ... Show more

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Abstract

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.

Date issued

2014-09

URI

http://hdl.handle.net/1721.1/89202

Department

Massachusetts Institute of Technology. Department of Physics

Journal

Physical Review Letters

Publisher

American Physical Society

Citation

Akondi, C. S., et al. "Measurement of the Transverse Target and Beam-Target Asymmetries in η Meson Photoproduction at MAMI." Phys. Rev. Lett. 113, 102001 (September 2014). © 2014 American Physical Society

Version: Final published version

ISSN

0031-9007

1079-7114

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