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Abstract
We study a new nucleon resonance fromphotoproduction, which was observed at √ s = 1675 MeV with a narrow decay width (∼ 10 MeV) by the Tohoku LNS group as well as the GRAAL collaboration. Using an effective Lagrangian approach, we compute differential cross sections for the � photoproduction. In addition to N � (1675,1/2 ± ,3/2 ± ), we employ six other nucleon resonances, i.e. N � (1520,1535,1650,1675,1710,1720) and vector meson exchanges which are the most relevant ones to this reaction process. As a result, we can reproduce the GRAAL data qualitatively well and observe obvious isospin asymmetry between the transition magnetic moments of N � (1675): µnn� ≫ µpp�, which indicates that the newly found nucleon resonance may be identified as a non-strange pentaquark state.
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