Study of η and η′ Photoproduction at MAMI

V. L. Kashevarov, P. Ott, S. Prakhov, P. Adlarson, F. Afzal, Z. Ahmed, C. S. Akondi, J. R M Annand, H. J. Arends, R. Beck, A. Braghieri, W. J. Briscoe, F. Cividini, R. F B Codling, C. Collicott, S. Costanza, A. Denig, E. J. Downie, M. Dieterle, M. I. Ferretti BondyL. V. Fil'kov, A. Fix, S. Gardner, S. Garni, D. I. Glazier, D. Glowa, W. Gradl, G. Gurevich, D. J. Hamilton, D. Hornidge, D. Howdle, G. M. Huber, A. Käser, S. Kay, I. Keshelashvili, R. Kondratiev, M. Korolija, B. Krusche, J. Linturi, V. Lisin, K. Livingston, I. J D MacGregor, R. Macrae, J. Mancell, D. M. Manley, P. Martel, J. C. McGeorge, E. McNicol, D. G. Middleton, R. Miskimen, (A2 Collaboration at MAMI)

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Abstract

The reactions γp→ηp and γp→η′p are measured from their thresholds up to the center-of-mass energy W=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 η′ threshold, W=1896 MeV (Eγ=1447 MeV). Within the framework of a revised ηMAID isobar model, the cusp, in connection with a steep rise of the η′ total cross section from its threshold, can only be explained by a strong coupling of the poorly known N(1895)1/2- state to both ηp and η′p. Including the new high-accuracy results in the ηMAID fit to available η and η′ photoproduction data allows the determination of the N(1895)1/2- properties.

Original languageEnglish
Article number212001
JournalPhysical Review Letters
Volume118
Issue number21
DOIs
Publication statusPublished - 26 May 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    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. F. B., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Dieterle, M., ... (A2 Collaboration at MAMI) (2017). Study of η and η′ Photoproduction at MAMI. Physical Review Letters, 118(21), [212001]. https://doi.org/10.1103/PhysRevLett.118.212001