This article is cited in 4 papers

FIELDS, PARTICLES, AND NUCLEI

On narrow nucleon excitation N$^*$(1685)

V. Kuznetsov^a, M. V. Polyakov<sup>bc

a</sup> Institute for Nuclear Research, Russian Academy of Sciences, Moscow
^b Institute of Theoretical Physics II, Ruhr-Universität Bochum
^c B. P. Konstantinov Petersburg Nuclear Physics Institute, Russian Academy of Sciences

Abstract: We perform estimates on putative narrow nucleon N$^*$(1685) – the candidate for the non-strange member of the exotic anti-decuplet of baryons. In particular, we consider the recent high precision data on $\eta$ 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 $W\sim 1650$–$1750$ 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.

Received: 16.08.2011

Language: English

 English version: Journal of Experimental and Theoretical Physics Letters, 2011, 94:7, 503–507

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