JETP Letters

, Volume 94, Issue 7, pp 503–507 | Cite as

On narrow nucleon excitation N*(1685)

  • V. Kuznetsov
  • M. V. Polyakov
  • M. Thürmann
Fields, Particles, and Nuclei

Abstract

We perform estimates on putative narrow nucleon N* (1685), which is a candidate for the non-strange member of the exotic anti-decuplet of baryons. In particular, we consider the recent high precision data on η photoproduction off free proton obtained by the Crystal Ball Collaboration at MAMI. We show that it is difficult to describe peculiarities of these new data in the invariant energy interval of W ∼ 1650–1750 MeV in terms of known wide resonances. Using very simple estimates, we show that the data may indicate an existence of a narrow N* (1685) with small photocoupling to the proton.

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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • V. Kuznetsov
    • 1
  • M. V. Polyakov
    • 2
    • 3
  • M. Thürmann
    • 3
  1. 1.Institute for Nuclear ResearchRussian Academy of SciencesMoscowRussia
  2. 2.Institut für Theoretische Physik IIRuhr-Universität BochumBochumGermany
  3. 3.Petersburg Nuclear Physics InstituteRussian Academy of SciencesSt. PetersburgRussia

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