Threshold [pi superscript 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, Cristina; Costanza, S.; Downie, E. J.; Dieterle, M.; Fernández-Ramírez, 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, Adam James, 1965-; 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.; Werthmüller, D.; Witthauer, L.; Wolfes, M.

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Threshold [pi superscript 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, Cristina; Costanza, S.; Downie, E. J.; Dieterle, M.; Fernández-Ramírez, 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, Adam James, 1965-; 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.; Werthmüller, D.; Witthauer, L.; Wolfes, M.

Date: 2015-09-14

Type: Text

ISSN: 0370-2693

Source:

Physics letters B 750, 252-258. (2015)

Abstract:

Polarisation-dependent differential cross sections [sigma][subscript Tau] associated with the target asymmetry [Tau] have been measured for the reaction [gamma arrow over p] [right arrow] p[pi superscript 0] with transverse target polarisation from [pi superscript 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][subscript Tau] have been used in combination with our previous measurements of the unpolarised cross section [sigma subscript 0] and the beam asymmetry Σ for a model-independent determination of S- and P-wave multipoles in the [pi superscript 0] threshold region, which includes for the first time a direct determination of the imaginary part of the E[subscript 0+] multipole.