Study of eta and eta' Photoproduction at MAMI

A2 Collaboration 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. Codling, C. Collicott, S. Costanza, A. Denig, E. J. Downie, M. DieterleM. I. Ferretti Bondy, L. 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. Kaser, 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. P. Martel, C. Mullen, S. Schumann, D. P. Watts, L. Zana

Research output: Contribution to journalArticlepeer-review

Abstract

The reactions gamma p -> eta p and gamma p -> eta'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 eta photoproduction at the energies in the vicinity of the eta' threshold, W = 1896 MeV (E-gamma = 1447 MeV). Within the framework of a revised eta MAID isobar model, the cusp, in connection with a steep rise of the eta' 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 eta p and eta' p. Including the new high-accuracy results in the eta MAID fit to available eta and eta' photoproduction data allows the determination of the N(1895)1/2(-) properties.

Original languageEnglish
Article number212001
Number of pages6
JournalPhysical Review Letters
Volume118
Issue number21
DOIs
Publication statusPublished - 26 May 2017

Keywords

  • SPECTROMETER
  • PHOTONS
  • PROTON
  • TAPS

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