Study of η and η' photoproduction at MAMI

Kashevarov, V.L. et al. (2017) Study of η and η' photoproduction at MAMI. Physical Review Letters, 118(21), 212001.

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Abstract

The reactions γp → ηp and γp → η0 p are measured from their thresholds up to the center-of-mass energy W ¼ 1.96 GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections are obtained with unprecedented statistical accuracy, providing fine energy binning and full production-angle coverage. A strong cusp is observed in the total cross section for η photoproduction at the energies in the vicinity of the η0 threshold, W ¼ 1896 MeV (Eγ ¼ 1447 MeV). Within the framework of a revised ηMAID isobar model, the cusp, in connection with a steep rise of the η0 total cross section from its threshold, can only be explained by a strong coupling of the poorly known Nð1895Þ1=2− state to both ηp and η0 p. Including the new high-accuracy results in the ηMAID fit to available η and η0 photoproduction data allows the determination of the Nð1895Þ1=2− properties.

Item Type:Articles
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 Werthmueller, Dr Dominik and MacGregor, Professor I and Livingston, Dr Kenneth and Howdle, Mr David and Gardner, Mr Simon and Mullen, Mr Christopher and Macrae, Mr Roddy and Annand, Dr John and Hamilton, Dr David and Rosner, Professor Guenther
Authors: Kashevarov, V.L., Ott, P., Prakhov, S., Adlarson, P., Afzal, F., Ahmed, Z., Akondi, C.S., Annand, J.R.M., Arends, H.J., Beck, R., Braghieri, A., Briscoe, W.J., Cividini, F., Codling, R., Collicott, C., Costanza, S., Denig, A., Downie, E.J., Dieterle, M., Ferretti Bondy, M.I., Filkov, L.V., Fix, A., Gardner, S., Garni, S., Glazier, D.I., Glowa, D., Gradl, W., Gurevich, G., Hamilton, D.J., Hornidge, D., Howdle, D., Huber, G.M., Käser, A., Kay, S., Keshelashvili, I., Kondratiev, R., Korolija, M., Krusche, B., Linturi, J., Lisin, V., Livingston, K., MacGregor, I.J.D., MacRae, R., Mancell, J., Manley, D.M., Martel, P.P., McGeorge, J.C., McNicol, E., Middleton, D.G., Miskimen, R., Mornacchi, E., Mullen, C., Mushkarenkov, A., Neiser, A., Oberle, M., Ostrick, M., Otte, P.B., Oussena, B., Paudyal, D., Pedroni, P., Polyanski, V.V., Rajabi, A., Reicherz, G., Robinson, J., Rosner, G., Rostomyan, T., Sarty, A., Schott, D.M., Schumann, S., Sfienti, C., Sokhoyan, V., Spieker, K., Steffen, O., Strandberg, B., Strakovsky, I.I., Strub, T., Supek, I., Taragin, M.F., Thiel, A., Thiel, M., Tiator, L., Thomas, A., Unverzagt, M., Wagner, S., Watts, D.P., Werthmüller, D., Wettig, J., Witthauer, L., Wolfes, M., Workman, R.L., and Zana, L.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
Published Online:26 May 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Physical Review Letters 118(21):212001
Publisher Policy:Reproduced under a Creative Commons License
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
570711Nuclear Physics GroupDavid IrelandScience & Technologies Facilities Council (STFC)ST/J000175/1P&A - PHYSICS & ASTRONOMY
507271Illuminating strongly interacting matterI MacgregorScience & Technologies Facilities Council (STFC)ST/G008604/1P&A - PHYSICS & ASTRONOMY