Photon asymmetry measurements of γp → π0p for Eγ = 320–650 MeV

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
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Strandberg, Mr Bruno and Livingston, Dr Kenneth and Howdle, Mr David and Glazier, Dr Derek and McGeorge, Dr John and Gardner, Mr Simon and Robinson, Mr Jamie and Owens, Professor Robert and Mullen, Mr Christopher and Macrae, Mr Roddy and MacGregor, Professor I 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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
507271Illuminating strongly interacting matterI MacgregorScience & Technologies Facilities Council (STFC)ST/G008604/1P&A - PHYSICS & ASTRONOMY