Threshold pi(0) photoproduction on transverse polarised protons at MAMI
- Schumann, S.
- Otte, P. B.
- Akondi, C. S.
- Annand, J. R. M.
- Arends, H. -J.
- Beck, R.
- Bernstein, A. M.
- Borisov, N.
- Braghieri, A.
- Briscoe, W. J.
- Cherepnya, S.
- Collicott, C.
- Costanza, S.
- Downie, E. J.
- Dieterle, M.
- Fernandez-Ramirez, C.
- 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.
- Miskimen, R.
- Mushkarenkov, A.
- Nefkens, B. M. K.
- Neganov, A.
- Nikolaev, A.
- Oberle, M.
- Ostrick, M.
- Ortega, H.
- Ott, P.
- Oussena, B.
- Paudyal, D.
- Pedroni, P.
- Polonski, A.
- Polyanski, V. V.
- Prakhov, S.
- Reicherz, G.
- Rostomyan, T.
- Sarty, A.
- Sikora, M. H.
- Sokhoyan, V.
- Steffen, O.
- Strakovsky, I. I.
- Strub, Th.
- Supek, I.
- Tiator, L.
- Thomas, A.
- Unverzagt, M.
- Usov, Yu. A.
- Watts, D. P.
- Werthmueller, D.
- Witthauer, L.
- Wolfes, M.
DOIAbstract
Polarisation-dependent differential cross sections sigma(T) associated with the target asymmetry T have been measured for the reaction gamma (p)over arrow -> p pi(0) with transverse target polarisation from pi(0) threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball/TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for sigma(T) have been used in combination with our previous measurements of the unpolarised cross section sigma(0) and the beam asymmetry Sigma for a model-independent determination of S- and P-wave multipoles in the pi(0) threshold region, which includes for the first time a direct determination of the imaginary p...
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