First measurement of target and beam-target asymmetries in the γp→π0ηp reaction

Authors :: Annand, J.R.M.
Arends, H. J.
Beck, R.
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. P.
McNicoll, E. F.
Meyer, W.
Middleton, D. G.
Miskimen, R.
Mushkarenkov, A.
Neganov, A.
Nikolaev, A.
Oberle, M.
Ortega, H.
Ostrick, M.
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.
Publication Year :: 2015
Publisher :: American Physical Society, 2015.
Abstract: The first data on target and beam-target asymmetries for the γp→π0ηp reaction at photon energies from 1050 up to 1450 MeV are presented. The measurements were performed using the Crystal Ball and TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. The general assumption that the reaction is dominated by the Δ3/2− amplitude is confirmed. The data are in particular sensitive to small contributions from other partial waves.

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