Gardner, S. et al. (2016) Photon asymmetry measurements of γp → π0p for Eγ = 320–650 MeV. European Physical Journal A, 52, 333. (doi: 10.1140/epja/i2016-16333-5)
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Abstract
High-statistics measurements of the photon asymmetry Σ for the γp → π0p reaction have been made in the center-of-mass energy range W = 1214–1450 MeV. The data were measured with the MAMI A2 real photon beam and Crystal Ball/TAPS detector systems in Mainz, Germany. The results significantly improve the existing world data and are shown to be in good agreement with previous measurements, and with the MAID, SAID, and Bonn-Gatchina predictions. We have also combined the photon asymmetry results with recent cross-section measurements from Mainz to calculate the profile functions, Σˇ (= σ0Σ), and perform a moment analysis. Comparison with calculations from the Bonn-Gatchina model shows that the precision of the data is good enough to further constrain the higher partial waves, and there is an indication of interference between the very small F-waves and the N(1520)3/2− and N(1535)1/2− resonances.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Strandberg, Mr Bruno and Glazier, Dr Derek and McGeorge, Dr John and Robinson, Mr Jamie and MacGregor, Professor Douglas and Livingston, Dr Kenneth and Howdle, Mr David and Gardner, Mr Simon and Owens, Professor Robert and Mullen, Mr Christopher and Macrae, Mr Roddy and Annand, Dr John and Hamilton, Dr David and Rosner, Professor Guenther |
Authors: | Gardner, S., Howdle, D., Sikora, M.H., Wunderlich, Y., Abt, S., Achenbach, P., Afzal, F., Aguar-Bartolome, P., Ahmed, Z., Annand, J.R.M., Arends, H.J., Bantawa, K., Bashkanov, M., Beck, R., Biroth, M., Borisov, N.S., Braghieri, A., Briscoe, W.J., Cherepnya, S., Cividini, F., Costanza, S., Collicott, C., Demissie, B.T., Denig, A., Dieterle, M., Downie, E.J., Drexler, P., Ferretti-Bondy, M.I., Filkov, L.V., Glazier, D.I., Garni, S., Gradl, W., Günther, M., Gurevich, G.M., Hall Barrientos, P., Hamilton, D., Heid, E., Hornidge, D., Huber, G.M., Jahn, O., Jude, T.C., Käser, A., Kay, S., Kashevarov, V.L., Keshelashvili, I., Kondratiev, R., Korolija, M., Krusche, B., Linturi, J.M., Lisin, V., Livingston, K., Lutterer, S., MacGregor, I.J.D., Macrae, R., Mancell, J., Manley, D.M., Martel, P.P., McGeorge, J.C., McNicoll, E.F., Middleton, D.G., Miskimen, R., Mullen, C., Mushkarenkov, A., Neganov, A.B., Neiser, A., Nikolaev, A., Oberle, M., Ostrick, M., Owens, R.O., Otte, P.B., Oussena, B., Paudyall, D., Pedroni, P., Polonski, A., Prakhov, S., Rajabi, A., Robinson, J., Rosner, G., Rostomyan, T., Sarty, A., Schumann, S., Sokhoyan, V., Spieker, K., Steffen, O., Sfienti, C., Strakovsky, I.I., Strandberg, B., Strub, T., Supek, I., Tarbert, C.M., Thiel, A., Thiel, M., Thomas, A., Unverzagt, M., Usov, Y.A., Watts, D.P., Werthümller, D., Wettig, J., Wolfes, M., Witthauer, L., and Zana, L. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | European Physical Journal A |
Publisher: | Springer |
ISSN: | 1434-6001 |
ISSN (Online): | 1434-601X |
Published Online: | 17 November 2016 |
Copyright Holders: | Copyright © 2016 The Authors |
First Published: | First published in European Physical Journal A 52: 333 |
Publisher Policy: | Reproduced under a Creative Commons License |
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